New Hot Laptop Batteries:
Asus Eee PC 901 1000 1000H Battery is designed to compliable with Asus AL23-901, Asus AL24-1000 EeePC 901 12G,EeePC 901 20G,EeePC 901-BK002X,EeePC 901-BK002X,EeePC 901 Series,EeePC 901-W001,EeePC 901-W001,EeePC 901-W003X,EeePC 1000,EeePC 1000-BK003,EeePC 1000H,EeePC 1000H 20GB,EeePC 1000H 80GB,EeePC 1000H Series,EeePC 1000 Series Laptop Batteries
Acer Aspire One Series Battery is designed to compliable with UM08A73, UM08A72, UM08A71, UM08A31, Acer Aspire One A110L Series,Acer Aspire One A150L Series,Acer Aspire One A150X Series,Acer Aspire One AoA110-1295 Series,Acer Aspire One AoA110-1722 Series,Acer Aspire One AoA150-1006 Series,Acer Aspire One Series Laptop Batteries
HP 2133 Series Battery is designed to compliable with HP 482262-001, HSTNN-IB64, HSTNN-DB63, HP 2133 Mini-Note PC 8.9 series Laptop Batteries
Compaq Evo N620 Battery is designed to compliable with 8CEL Compaq 250848-B25 232633-001 229783-001 laptop batteries
Asus EeePC 700 701 800 900 Battery is designed to compliable with 90-OA001B1100, 7BOAAQ040493, A22-P701H, A22-700, A22-P701,ASUS EeePC 700,ASUS EeePC 701,ASUS EeePC 701C,ASUS EeePC 801,ASUS EeePC 8G (1G RAM),ASUS EeePC 900 Series laptop batteries
Replacement for Hot Wholesale Laptop Models:
Sony VGP-BPS2C Battery is designed to compliable with Sony VGP-BPS2C, Sony VGP-BPS2B, Sony VGP-BPS2A, Sony VGP-BPL2C, Sony VGP-BPL2A, Sony VGP-BPL2, Sony VGP-BPS2 Laptop Batteries
Toshiba PA3399U-1BRS Battery is designed to compliable with Toshiba PA3478U-1BRS, Toshiba PA3400U-1BRS, Toshiba PA3399U-2BRS, Toshiba PA3399U-2BAS, Toshiba PA3399U-1BRS, Toshiba PA3399U-1BAS Laptop Batteries
Dell Latitude D620 Battery is designed to compliable with Dell NT379, Dell JD634, Dell 451-10298, Dell 312-0653, Dell 312-0383, Dell 310-9080, Dell PC764 Laptop Batteries
HP Pavilion ZV5000 Battery is designed to compliable with HSTNN-UB02, HSTNN-DB02, DP390A, 383966-001, 380443-001, 378859-001, 371916-001, 371914-001, 350836-001, 346971-001, 346970-001 laptop batteries
Compaq Presario 2500 Battery is designed to compliable with F4812A, F4809A, F4098A, 916-2150, 383615-001, 371786-001, 371785-001, 361742-001, 319411-001 laptop batteries
Replacement for Hot Sony Laptop Models:
Sony VGP-BPS9 Battery is designed to compliable with Sony AR41E, AR41L, AR41M, AR41S, AR47G, AR49G, AR520E, AR550E, AR550U, SZ51B/B, SZ52B/B, SZ53B/B, SZ5MN/B, SZ5VN/X, SZ5VWN/X, SZ5XN/C, SZ5XWN/C
Laptop Batteries
Sony VGP-BPS8 Battery is designed to compliable with Sony VGN-FZ70B VGN-FZ50B VGN-FZ90NS VGN-FZ90S VGN-FZ90HS Laptop Batteries
Sony VGP-BPS5 Battery is designed to compliable with Sony VGP-BPS5A, Sony VGP-BPL5A, Sony VGP-BPS5 Laptop Batteries
Sony PCGA-BP71 Battery is designed to compliable with Sony PCGA-BP71CE7, Sony PCGA-BP71AUC, Sony PCGA-BP71A, Sony PCGA-BP7, Sony PCGA-BP1N, Sony PCGA-BP71 laptop batteries
Replacement for Hot HP Laptop Models:
HP NC4200 Battery is designed to compliable with PB991A, HSTNN-IB12, 383510-001, 381373-001 Laptop Batteries
HP NX7400 Battery is designed to compliable with PB992A, HSTNN-UB11, HSTNN-OB06, HSTNN-LB11, HSTNN-DB11, 398876-001, 381374-001, HSTNN-DB06 Laptop Batteries
HP DV2000 Battery is designed to compliable with HSTNN-DB42, EX941AA, EV088AA, 452057-001, 436281-241, 417066-001, 411462-421, HSTNN-LB31 Laptop Batteries
HP DV9000 Battery is designed to compliable with EX942AA, EV087AA, 448007-001, 434674-001, 416996-131 laptop batteries
HP DV8000 Battery is designed to compliable with HSTNN-OB20, HSTNN-IB20, HSTNN-DB20, EG417AA, EF419A, 403808-001, 396008-001, 395789-003, 395789-002, 395789-001 laptop batteries
Replacement for Hot Compaq Laptop Models:
Compaq M2000 Battery is designed to compliable with PM579A, PF723A, HSTNN-UB17, HSTNN-UB09, HSTNN-MB10, HSTNN-MB09, HSTNN-LB17, HSTNN-LB09, HSTNN-IB17, HSTNN-IB10, HSTNN-IB09, HSTNN-DB17, HSTNN-DB10, 398752-001, 398065-001, 396600-001, 391883-001, 383493-001, 367759-001 Laptop Batteries
Compaq Presario 1700 Battery is designed to compliable with COMPAQ PPB004A, 291369-B25, 281235-001, 280207-001, 278418-B24, 240258-001, 198709-001, 191258-B21, DG105A, 289053-001, 281234-001, 280206-001, 267747-001, 239551-001, 196234-B22, 191169-001, 4195818-292, 289052-001, 281233-001, 279665-001, 265651-B25, 234219-B21, 192835-001, 190336-001, 338669-001, 281766-001, 280611-001, 278418-B25, 251344-001, 200002-001, 191259-B21, 182281-001 Laptop Batteries
Compaq Presario V3000 Battery is designed to compliable with 411462-421, 417066-001, 436281-241, 452057-001, EV088AA, EX941AA, HSTNN-DB42, HSTNN-LB31 Laptop Batteries
COMPAQ Presario R3000 Laptop Battery is designed to compliable with COMPAQ HSTNN-UB02, HSTNN-DB02, DP390A, 383966-001, 380443-001, 378859-001, 371916-001, 371914-001, 350836-001, 346971-001, 346970-001 laptop batteries
Compaq TC1000 Battery is designed to compliable with 348333-001, 303175-B25, 302119-001, 301956-001, DC907A laptop batteries
Replacement for Hot Dell Laptop Models:
Dell Inspiron 6000 Battery is designed to compliable with Dell YF976, Dell Y4873, Dell U4873, Dell G5266, Dell G5260, Dell F5635, Dell D5318, Dell C5974, Dell 312-0455, Dell 312-0429, Dell 312-0350, Dell 312-0349, Dell 312-0348, Dell 312-0340, Dell 312-0339, Dell 310-6322, Dell 310-6321 Laptop Batteries
Dell Inspiron 6400 Battery is designed to compliable with Dell XU937, Dell UD267, Dell RD859, Dell GD761, Dell 451-10424, Dell 451-10338, Dell 312-0599, Dell 312-0466, Dell 312-0461 Laptop Batteries
Dell 1691P Battery is designed to compliable with Dell IM-M150268-GB, Dell BAT-I3700, Dell 8M815, Dell 851UY, Dell 77TCJ, Dell 75UYF, Dell 6H410, Dell 66912, Dell 53977, Dell 5208U, Dell 5081P, Dell 3K120, Dell 3H625, Dell 3H352, Dell 3149C, Dell 312-3250, Dell 312-0028, Dell 312-0009, Dell 2M400, Dell 1K500, Dell 1691P Laptop Batteries
Replacement for Hot IBM Laptop Models:
IBM T60 Battery is designed to compliable with IBM FRU 92P1141, IBM FRU 92P1139, IBM FRU 92P1137, IBM ASM 92P1140, IBM ASM 92P1138, IBM 40Y6799, IBM FRU 92P1125 , IBM FRU 92P1123, IBM FRU 92P1121, IBM ASM 92P1126 , IBM ASM 92P1122, IBM 40Y6793, IBM 40Y6791 Laptop Batteries
IBM X61 Tablet Battery is designed to compliable with FRU 42T5251, FRU 42T5208, FRU 42T5206, FRU 42T5204, ASM 42T5209, 40Y8318, 40Y8314 Laptop Batteries
IBM T43 Battery is designed to compliable with IBM FRU 92P1077, IBM FRU 92P1073, IBM FRU 92P1069, IBM FRU 08K8214, IBM FRU 08K8201, IBM FRU 08K8198, IBM FRU 08K8195, IBM FRU 08K8193, IBM ASM 92P1076, IBM ASM 92P1064, IBM ASM 08K8199, IBM ASM 08K8198, IBM ASM 08K8197, IBM ASM 08K8196, IBM ASM 08K8192, IBM 93P5003, IBM 93P5002, IBM 92P1102, IBM 92P1101, IBM 92P1091, IBM 92P1090, IBM 92P1089, IBM 92P1088, IBM 92P1087, IBM 92P1075, IBM 92P1074, IBM 92P1071, IBM 92P1070, IBM 92P1067, IBM 92P1062, IBM 92P1061, IBM 92P1060, IBM 92P1058, IBM 92P1013, IBM 92P1011, IBM 92P1010, IBM 08K8194 Laptop Batteries
IBM X60 Battery is designed to compliable with IBM FRU 92P1227, IBM FRU 92P1173, IBM FRU 92P1171, IBM FRU 92P1169, IBM FRU 92P1167, IBM ASM 92P1174, IBM ASM 92P1170 laptop batteries
IBM X40 Battery is designed to compliable with IBM FRU 92P1149, IBM FRU 92P1147, IBM FRU 92P1145, IBM FRU 92P1143, IBM FRU 92P1078, IBM FRU 92P1002, IBM FRU 92P0998, IBM 92P1148, IBM 92P1146, IBM 92P1119, IBM 92P1080, IBM 92P1009, IBM 92P1005, IBM 92P1003, IBM 92P1001, IBM 92P1000, IBM 92P0999 laptop batteries
Replacement for Hot Toshiba Laptop Models:
Toshiba PA3383U-1BRS Battery is designed to compliable with Toshiba PA3383U-1BRS, Toshiba PA3383U-1BAS, Toshiba PA3383U, Toshiba PA3383, Laptop Batteries
Toshiba PA3356U-1BRS Battery is designed to compliable with Toshiba PA3588U-1BRS, Toshiba PA3509U-1BRM, Toshiba PA3456U-1BRS, Toshiba PA3357U-3BRL, Toshiba PA3357U-1BRL, Toshiba PA3356U-3BRS, Toshiba PA3356U-3BAS, Toshiba PA3356U-2BRS, Toshiba PA3356U-2BAS, Toshiba PA3356U-1BRS, Toshiba PA3356U-1BAS Laptop Batteries
Toshiba PA3285U-1BRS Battery is designed to compliable with Toshiba PA3285U-3BRS, Toshiba PA3285U-2BRS, Toshiba PA3285U-2BAS, Toshiba PA3285U-1BRS, Toshiba PA3285U-1BAS, Toshiba PA3284U-1BRS, Toshiba PA3284U-1BAS laptop batteries
Replacement for Hot Acer Laptop Models:
Acer BTP-63D1 Battery is designed to compliable with LC.BTP01.020, LC.BTP01.009, LC.BTP01.005, BT.T8603.001, BT.T2803.001, BT.00805.002, BT.00804.007, BT.00803.007, BT.00403.005, 91.49Y28.002, 91.49Y28.001, 60.49Y02.001, BTP-63D1 Laptop Batteries
Acer BTP-AMJ1 Battery is designed to compliable with MS2180, LC.BTP01.010, GARDA32, GARDA31, BTP-B2J1, BTP-ASJ1, BTP-AS3620, BTP-ARJ1, BTP-AQJ1, BTP-APJ1, BTP-AOJ1, BTP-ANJ1, BT.00604.006, BT.00603.012, BTP-AMJ1 Laptop Batteries
Acer Aspire 3000 Battery is designed to compliable with BT.T5007.002, BT.T5007.001, BT.T5005.002, BT.T5005.001, BT.T5003.002, BT.T5003.001, BTP-AS1681, 4UR18650F-1-QC192, LC.BTP03.003 Laptop Batteries
Acer BATCL50L Battery is designed to compliable with LC.BTP04.001, LC.BTP00.004, BT.T3506.001, BT.T3504.001, BT.3506.001, BT.00803.005, BATCL50L4, BATCL50L laptop batteries
Acer BTP-58A1 Battery is designed to compliable with LC.BTP03.002, LC.BTP01.003, BT.T3007.003, BT.T3007.001, BT.T3004.001, BTP-85A1, BTP-84A1, BTP-60A1, BTP-59A1, BT.00803.004, 91.49V28.001, 909-2420, BTP-58A1 laptop batteries
Replacement for Hot Asus Laptop Models:
Asus A32-A8 Battery is designed to compliable with 90-NF51B1000, 70-NF51B1000, A32-A8 Laptop Batteries
Asus A42-A6 Battery is designed to compliable with A42-A3, 90-NIL1B2000, 90-NHJ9B1000Z, 90-NH73B1000Z, 90-NG31B1000, 90-NFPCB2001, 90-NFPCB1001, 90-NFJ1B1000, 90-NDM1B1000, 90-NDK1B1000, 90-ND01B1000, 90-NCG1B1010, 90-NCG1B1000, 90-NA71B1100, 90-NA52B2000, 90-NA51B2200, 90-NA51B2100, 90-NA51B2000, 90-NA51B1000, 70-NFH5B2000M, 70-NA51B2100, 70-NA51B1100, A42-A6 Laptop Batteries
Asus A32-W7 Battery is designed to compliable with Asus A32-W7, Asus A32-M9, Asus 90-NHQ2B1000, Asus 90-NDT1B1000Z, Asus 90-NDQ1B1000, Asus 70-NHQ2B1000M laptop batteries
Asus A32-S6 Battery is designed to compliable with A31-S6, 90-NEA1B2000, 90-NEA1B1000, A32-S6, laptop batteries
Replacement for Hot Apple Laptop Models:
Apple A1185 Battery is designed to compliable with MA561J_A, MA561G_A, MA561FE_A, MA561, A1185 Laptop Batteries
Apple A1175 Battery is designed to compliable with MA348J_A, MA348G_A, MA348_A, MA348, A1175 Laptop Batteries
Apple A1012 Battery is designed to compliable with M8511, M8244G_B, M8244G_A, M8244G, M8244, M6091, 661-2740, 661-2561, 661-2441, 616-0151, 616-0139, 616-0133, 616-0132, A1012 Laptop Batteries
Apple A1060 Battery is designed to compliable with M9572J_A, M9572G_A, M9324J_A, M9324G_A, M9324G, M9324, M8984G_A, M8984G, M8984, A1079, A1022, 661-3233, 661-2787, A1060 laptop batteries
Apple A1061 Battery is designed to compliable with M9337G_A, M9337G, M9337, M8956J_A, M8956G_A, M8956G, M8956, M8626G_A, M8433G_B, M8433G_A, M8433G, M8433, M8403, A1061, 8403, 661-2994, 661-2672, 661-2569, 661-2472, 661-1764, A1008 laptop batteries
Replacement for Hot Fujitsu Laptop Models:
Fujitsu FPCBP83 Battery is designed to compliable with FPCBP83, FPCBP79AP, FPCBP79, FM-42, FM-41, 644190, 644180, 0644190, FPCBP83AP laptop batteries
Replacement for Hot Samsung Laptop Models:
Samsung X60 Battery is designed to compliable with AA-PB4NC6B_E, AA-PB4NC6B, AA-PB2NC6B_E, AA-PB2NC6B Laptop Batteries
Samsung X50 Battery is designed to compliable with SSB-X15LS6S, SSB-X15LS6_E, SSB-X15LS6_C, SSB-X15LS6, SSB-X15LS3 Laptop Batteries
Samsung X10 Battery is designed to compliable with SSB-X10LS6S, SSB-X10LS6_E, SSB-X10LS6_C, SSB-X10LS6, SSB-X10LS3_E, SSB-X10LS3_C, SSB-X10LS3 Laptop Batteries
Samsung R55 Battery is designed to compliable with AA-PL1NC9B_E, AA-PL1NC9B, AA-PL0UC6B_E, AA-PL0UC6B, AA-PL0NC9B_E, AA-PL0NC9B, AA-PB1NC6B_E, AA-PB1NC6B, AA-PB0NC6B_E, AA-PB0NC6B laptop batteries
Samsung X1 Battery is designed to compliable with AA-PL0NC8B_E, AA-PL0NC8B, AA-PBONC4B, AA-PB1NC4B_E, AA-PB0NC4B_E laptop batteries
Laptop battery usage tips
1. A new battery usually comes in a discharged condition and with a very low capacity. It is generally recommended to fully charge new battery packs before use. Refer to the users?guide of your electronic device for charging instructions.
2. A new battery pack needs to be circled (fully discharged and recharged) three to five times to reach its optimum performance.
3. Rechargeable battery will undergo self-discharging when left unused for a long period of time. Thus, it should always be stored in a fully charged state and kept in a cool, dry and clean place.
4. To maintain the optimum performance of a battery pack, it is highly recommended to circle (fully discharging and recharging) it at least once a month.
5. It is normal if a new battery gets warm when being charged or used. However, close attention should be paid if the battery pack becomes excessively hot. This may indicate there is a problem with the charging circuit of the electronic device. So, it is necessary to have it checked by a qualified technician.
6. New batteries are hard to be charged. Sometimes, your electronic device may indicate a fully charged condition about 10 to 15 minutes when the new battery pack is being charged for the first time. When this happens, remove the battery pack and let it cool down for about 10 to 15 minutes then repeat the charging procedure. Sometimes, a new battery will suddenly refuse to be charged. If this happens, it is then suggested to remove the battery from the device and reinsert it.
To better use your battery, please take care of the precautions listed below:
1. Do not modify or disassemble.
2. Do not incinerate or expose battery to excessive heat, which may result in an exposure.
3. Do not expose battery to water or other moist matters.
4. Do not pierce, hit, step on, crush or abuse the battery.
5. Do not place battery in device for a long period of time if device is not being used.
6. Do not short circuit the terminals or store your battery pack with metal objects such as necklaces or hairpins.
Frequently Asked Questions:
1. Basic knowledge about battery.
The quantity of electricity that can be obtained from a battery in one
cycle from full charge to full discharge when the battery is discharged under
conditions of rated current level and ambient temperature within the
predetermined range.Generally, capacity is expressed in units of mAh
(milliampere-hour).
a. What is Nominal Capacity?
The standard capacity designated by a battery manufacturer to identify a
particular cell model.
b. What is Nominal Voltage?
The standard voltage used to express the capacity of a particular battery
model. It is generally equal to its electromotive force or its approximate
voltage during normal operation. Typical Values:
o 1.2 volts per cell for NiCd and NiMH
o 3.6 or 3.7 volts per cell for Lithium Ion or Lithium Polymer
o 3 volts per cell for lithium primary
o 2 volts per cell for sealed lead acid
o 1.5 volts per cell for alkaline and carbon zinc .
c. What is discharge rate?
The discharge rate is the rate at which current is removed from a battery.
When a battery is discharged at a current level "i", for a period until the end
discharge voltage is '"h", the discharge is referred to as the h-hour rate
discharge, while "i" is known as the h-hour rate discharge current. For
practical use, nominal capacity is used as standard.
d. What is End-Voltage ?
The voltage that indicates the end limit of discharge. This voltage is
almost equivalent to limitation of practical use. Typical values:
o 1.0 volt per cell for NiCd and NiMH
o 1.75 volts per cell for sealed lead acid
o 2.75 volts per cell for lithium ion and lithium polymer
o 2.0 volts per cell for primary lithium
o 0.9 volts per cell for alkaline and carbon zinc
e. What is Open circuit voltage ?
The voltage between terminals of a battery without any load.
What is Operating voltage ?
The voltage between terminals when a battery is subjected to a load. Usually
expressed by the voltage of the battery at 50% discharge point.
f. What is Polarity Reversal ?
Reversing of polarity of the terminals of a small-capacity cell in a multi-
cell battery due to overdischarge.
g. What is Positive Electrode ?
The electrode which has a positive potential. Electric current from this
electrode flows in the external circuit during discharge.
h. What is Negative Electrode ?
The plate which has an electrical potential lower than that of the other
plate during normal cell operation. Electric current from the external circuit
flows into the cell at the negative electrode during discharge. Also called
minus electrode.
i. What is Self-Discharge ?
A decrease in battery capacity which occurs without any current flow to an
external circuit. Typical values:
0 ~ 1% per day for NiCd
0 ~ 2% per day for NiMH
0 ~ 0% per day for Lithium Ion and Lithium Polymer .
j. What is Short Circuit ?
Directly connecting the positive electrode (terminal) to the negative
electrode (terminal) of the battery.
k. What is Thermistor ?
A circuit element with a negative temperature coefficient. It is built into
batteries and used to detect ambient temperature or battery temperature. A
battery charger may use this device to properly charge a battery.
l. Resistance of the battery ?
One battery that does not perform well at a 1C discharge rate is the
portable sealed lead-acid. To obtain a reasonably good capacity reading,
manufacturers commonly rate these batteries at 0.05C or 20 hour discharge. Even
at this slow discharge rate, a 100% capacity is hard to attain. To compensate
for different readings at various discharge currents, manufacturers offer a
capacity offset. Applying the offset to correct the capacity readout does not
improve battery performance; it merely adjusts the capacity calculation if
discharged at a higher or lower C-rate than specified.
Lithium-ion/polymer batteries are electronically protected against high load
currents. Depending on battery type, the discharge is limited to between 1C and
2C. This protection makes the lithium ion unsuitable for biomedical equipment
and power tools demanding high inrush currents.
2. What's the best battery for laptops?
Batteries for laptops have a unique challenge - they must be small and
lightweight.In fact, the laptop battery should be invisible to the user and
deliver enough power to endure a five-hour flight from Toronto to Vancouver. In
reality, a typical laptop battery provides only about 90 minutes of service.
Many users complain of much shorter runtimes.
Computer manufacturers are hesitant to add a larger battery because of
increased size and weight. A recent survey indicated that, given the option of
larger size and more weight for longer runtimes, most users would settle for
what is being offered today. For better or worse, we have learned to accept the
short runtime of a laptop.
The energy density of modern batteries improves by about 10% per year.
However, the benefit of better battery performance is eaten up by higher power
requirements of laptops. This results in the same runtime but more powerful
laptops.
During the last few years, batteries have improved in terms of energy
density. But any benefit in better battery performance is being eaten up by the
higher power requirements of the laptops. This trend is continuing and the net
effect will be the same runtimes but more powerful laptops.
Most laptops are powered by lithium-ion. This chemistry has a high energy
density and is lightweight. There is no immediate breakthrough on the horizon of
a miracle battery that would provide more power than the current electro-
chemical battery.
Fuel cells, when available, will offer a continued stream of power by
allowing the exchange of fuel cartridges when empty. Unfortunately, commercial
fuel cells for laptops and other portable devices are still several years away.
Power handling, size and cost remain the biggest hurdles. The early fuel cells
will function more like a portable charger than a battery replacement. The fuel
cells currently in use have the difficulty in providing spontaneous high power
on demand.
The runtime of a laptop battery is based on the activity of the computer.
The basic housekeeping, which the computer needs to stay alive, draws less power
than, for example, reading, writing, computations and searching for files.
Manufacturers prefer using idle time when specifying runtime.
A battery in a laptop ages more quickly than in other applications because
of heat.During use, the inside temperature of a laptop rises to 45?C (113?F).
The combination of high temperature and full state-of-charge promotes cell
oxidation, a condition that cannot be reversedonce present. The battery's life
expectancy when operating at high temperature is half compared to running at a
more moderate 20?C (68?F) or lower. Leaving the laptop in a parked car under
the hot sun will also aggravate the situation. All batteries suffer permanent
capacity loss as part of elevated temperatures but lithium-ion is affected more
than other batteries.
Some Japanese computer manufacturers have introduced a number of sub-
housing. This design improves battery life because the battery is kept at room
temperature. Some models carry several size batteries to accommodate different
user demands.
Lithium-ion is well suited for laptop users who continually switch from
fixed power to battery use. This user pattern is typical for those in the sales,
service and medical field. Here is the reason why:
With nickel-based batteries, the charger applies a full charge each time the
portable device is connected to fixed power. The battery is put on charge until
a signal is received indicating that the battery is full. This signal is in form
of a voltage change or rising temperature. Because of the sluggish response,
permanent capacity loss occurs caused by overcharge and elevated temperature.
Lithium-ion only receives charge if the voltage is low .
3. How to calibrate the battery?
Most laptop batteries are 'smart'; meaning that they know how much energy is
left.Such a feature has definite benefits but the readings are often
inaccurate. A laptop may indicate 30 minutes of remaining runtime when suddenly
the screen goes dark.Here is the reason why:
With use and time, a tracking error occurs between the chemical battery and
the digital sensing circuit. The most ideal use of the 'smart' battery, as far
as fuel-gauge accuracy is concerned, is a full charge followed by a full
discharge at a constant current. In such a case, the tracking error would be
less than 1% per cycle. In real life, however, a battery may be discharged for
only a few minutes and the load may vary widely. Long storage also contributes
to errors because the circuit cannot accurately compensate for self-discharge.
Eventually, the true capacity of the battery no longer synchronizes with the
fuel gauge and a deliberate full charge and discharge is needed to 're-learn' or
calibrate the battery.
What happens if no battery calibration is done? Can such a battery be used
in confidence? Most 'smart' battery chargers obey the dictates of the chemical
cells rather than the electronic circuit. In this case, the battery will fully
charge regardless of the fuel gauge setting and function normally, but the
digital readout will become increasingly more inaccurate. If not corrected, the
fuel gauge simply becomes a nuisance.
At what point of a discharge does the reset occur? Lithium-ion is considered
fully discharged between 2.5 and 3.0 volts per cell. The electronic circuit in
the battery is designed to reset between these voltage levels. A problem occurs
if the laptop cuts off before this low voltage can be reached. In such a case,
an external charger with discharge function may be used. Cadex Electronics
manufactures 'smart' chargers and battery analyzers, both of which can be used
to test and calibrate the 'smart' battery.
4. How to prolong&store batteries?
Avoid frequent full discharges because this puts additional strain on the
battery. Several partial discharges with frequent recharges are better for
lithium-ion than one deep one. Recharging a partially charged lithium-ion does
not cause harm because there is no memory. (In this respect, lithium-ion differs
from nickel-based batteries.) Short battery life in a laptop is mainly caused by
heat rather than charge/discharge patterns.
Although memory-free, apply a deliberate full discharge once every 30
charges to calibrate batteries with fuel gauge. Running down the battery in the
equipment does this. If ignored, the fuel gauge will become increasingly less
accurate. The battery life will not be affected.
Keep the lithium-ion battery cool. Avoid a hot car. For prolonged storage,
keep the battery at a 40% charge level.
Consider removing the battery from a laptop when running on fixed power.
(Some laptop manufacturers are concerned about dust and moisture accumulating
inside the battery casing.)
Avoid purchasing spare lithium-ion batteries for later use. Observe
manufacturing date.Do not buy old stock, even if sold at clearance prices.
How to store batteries ?
Keep batteries in a cool and dry storage area. Refrigeration is recommended
but freezers should be avoided. When refrigerated, the battery should be placed
in a plastic bag to protect against condensation
Do not fully charge lithium and nickel-based batteries before storage. Keep
them partially charged and apply a full charge before use. Store lithium-ion at
about 40% state-of-charge (3.75-3.80V/cell open terminal). Lead-acid batteries
must be stored fully charged.
Do not store lithium-ion fully depleted. If empty, charge for about 30
minutes before storage. Self-discharge on a depleted battery may cause the
protection circuit to trip, preventing a recharge.
Do not stockpile lithium-ion batteries; avoid buying dated stock, even if
offered at a reduced price. Observe the manufacturing date, if available.
Never leave a nickel-based battery sitting on a charger for more than a few
days. Prolonged trickle charge causes crystalline formation (memory).
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