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Welcome to Battery-Export.com,Laptop Battery Wholesale or Retail Here.
Replacement DELL LATITUDE C840 Laptop Batteries |
DELL
1691P
Replacements |
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-Battery ID: BEDE22L
-Chemistry: Li-ion
-Volt: 14.80V ( Compatible with 14.4V )
-Capacity: 4400mAh
-Dimension: 138.50x90.00x21.00mm
-Net Weight: 510.29 g
-Color: Dark Grey
-Price: US $ 85.00 + (S&H rates)
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| Note: Brand new, best replacement for the original product. Full 1 year warranty! |
| Replacement Battery Code: |
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8M815,
851UY,
8208U,
77TCJ,
75UYF,
6H410,
66912,
53977,
5208U,
5081P,
3K120,
3H625,
3H352,
3149C,
312-3280,
312-3250,
312-0522,
312-0028,
312-0009,
310-0113,
2M400,
1K500,
1691P,
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| Fits Models: |
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PRECISION WORKSTATION M50,
PRECISION M50,
PRECISION M40,
Precision M Series,
LATITUDE PPX,
LATITUDE PPL,
LATITUDE PP01X,
LATITUDE PP01L,
LATITUDE PP01,
Latitude CPXJ650GT,
LATITUDE CPXJ 650GT,
LATITUDE CPXJ,
Latitude CPXH 500GT,
LATITUDE CPXH,
LATITUDE CPX,
Latitude CPTV466GT,
LATITUDE CPTV 466GT,
LATITUDE CPTV,
LATITUDE CPTS,
LATITUDE CPTC,
Latitude CPt S500GT,
LATITUDE CPT C333GT,
LATITUDE CPT,
LATITUDE CPM233XT,
LATITUDE CPM233ST,
LATITUDE CPM166ST,
Latitude CPm 233XT,
Latitude CPm 233ST,
Latitude CPm 166ST,
LATITUDE CPM,
LATITUDE CPIR400GT,
LATITUDE CPIR,
Latitude CPID Series,
Latitude CPID,
LATITUDE CPIC400GT,
Latitude CPiC333GT,
LATITUDE CPIC,
LATITUDE CPIA400XT,
LATITUDE CPIA366XT,
LATITUDE CPIA366ST,
LATITUDE CPIA300ST,
Latitude CPIA Series,
Latitude CPiA,
LATITUDE CPI D300XT,
Latitude CPi D300 XT,
LATITUDE CPI D266XT,
LATITUDE CPI D233,
LATITUDE CPI A366XT,
LATITUDE CPI 366,
LATITUDE CPI 233ST,
LATITUDE CPI,
LATITUDE CP SERIES,
Latitude CP,
LATITUDE C840,
LATITUDE C810,
LATITUDE C800,
LATITUDE C640,
LATITUDE C610,
LATITUDE C600,
LATITUDE C540,
LATITUDE C510,
LATITUDE C500,
Latitude C,
INSPIRON 8200 SERIES,
INSPIRON 8100 SERIES,
INSPIRON 8000 SERIES,
INSPIRON 4150 SERIES,
INSPIRON 4100 SERIES,
INSPIRON 4000 SERIES,
INSPIRON 3800 SERIES,
INSPIRON 3700 SERIES,
INSPIRON 2500 SERIES,
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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.
All of the battery has a natural course of discharging, after preserving for a long time; it has already finished discharging naturally. This does not influence the capacity of the battery. While charging for the first time, you should charge the battery to 12 hours continuously, circulation fill, discharge three (consult battery maintain first) by waking the new battery up completely totally, if the battery deposit several months, propose, go on complete filling, discharging 3 times to it too. If one battery still can not be charged after the 12 hour or three circulations this battery can not use needing to change.
Knowing the information above, while use the machine we should pay more attention to these items 1 try to fully charge and discharge the battery while using the machine. 2 Fully charge and discharge the battery once every two months. 3 If there is problem about the battery, our advice is pls try it by yourself first or contact to the service center to examine the battery.
Disclaimer:
The batteries and other products supplied by our Company are [replacement for] sold for use with certain product manufacturers, and any reference to products or trademarks of such companies is purely for the purpose of identifying the manufacturers with which our products [are replacement for] may be used. Our Company and this Web site are neither affiliated with, authorized by, licensed by, distributors for, nor related in any way to these manufacturers, nor are the products offered for sale through our web site manufactured by or sold with the authorization of the manufacturers with which our products [are replacement for] may be used.
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