This is a "Quick guide" to your battery - APPLIES TO Li-ion BATTERIES ONLY! (simplified version of an older thread http://xdaforums.com/showthread.php?p=3834773#post3834773 )
Charging tips
Discharging tips
Usage tips
* Selecting a charger that uses minimum charge-current termination (C/10 or C/x) can also extend battery life by not charging to 100% capacity. For example, ending a charge cycle when the current drops to C/5 is similar to reducing the float voltage to 4.1 V (see fig.3 bellow). In both instances, the battery is only charged to approximately 85% of capacity, which is an important factor in battery life. The letter “C” is a battery term used to indicate the battery manufacturers stated battery discharge capacity, measured in milliamp-hours. For example, a 2000-mAhr rated battery can supply a 2000-mA load for one hour before the cell voltage drops to its zero-capacity voltage.
Types of Li-ion batteries:
Charging dependencies:
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This info doesn't come from me but from 2 (I believe trustful) sources:
Isidor Buchmann,CEO of Cadex Electronics Inc., in Vancouver BC, award winning author of many articles and books on batteries,has studied about rechargeable batteries for 2 decades
Fran Hoffart, Applications Engineer, Linear Technology, Milpitas, California
Original web sites:
http://www.batteryuniversity.com/partone.htm
http://www.buchmann.ca/faq.asp
http://powerelectronics.com/portabl..._ics/proper_care_extends-li-ion-battery-0425/
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This info doesn't come from me but from 2 (I believe trustful) sources:
Isidor Buchmann,CEO of Cadex Electronics Inc., in Vancouver BC, award winning author of many articles and books on batteries,has studied about rechargeable batteries for 2 decades
Fran Hoffart, Applications Engineer, Linear Technology, Milpitas, California
Original web sites:
http://www.batteryuniversity.com/partone.htm
http://www.buchmann.ca/faq.asp
http://powerelectronics.com/portabl..._ics/proper_care_extends-li-ion-battery-0425/
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Charging tips
- partial-discharge cycles can greatly increase cycle life, and charging to less than 100% capacity can increase battery life even further
- after a full charge, a Li-ion battery will typically lose about 5% capacity in the first 24 hours, then approximately 3% per month because of self-discharge and an additional 3% per month if the battery pack has pack-protection circuitry
- no need to charge for 5+ hours for the first time (priming), this doesn't work for li-ion chemistry
- use ONLY ORIGINAL or HTC CERTIFIED chargers and batteries (they have extremely important function of cutting off
the current when charging is at 100% * ) - battery cannot be reconditioned by over-charging - avoid higher than 4,2V current (which might boost capacity but shorten cycle life)
- no need to worry about memory effect with "unscheduled" charging
- avoid soft reseting your phone while charging
- allow several full charges after doing hard reset to get accurate reading
- try to keep battery stress as low as possible when charging (sure shot is to charge the phone when turned off)
- a deliberate full discharge and recharge every 30 charges corrects "wrong reading" phenomena in most cases, if ignored, the battery gauge will become increasingly less accurate
- using battery chargers that feature a reduced float voltage (4-4.1V) can increase battery life when used to charge a 4.2V Li-ion battery
Discharging tips
- full discharge cycles (down to 2.5 V or 3 V, depending on chemistry) should be avoided if possible (except for above mentioned case of recalibrating device)
- using only 20% or 30% of the battery capacity before recharging will extend cycle life considerably. As a general rule, 5 to 10 shallow discharge cycles are equal to one full discharge cycle
- avoid frequent full discharges, very deep discharges will quickly, permanently damage a Li-ion battery
- avoid high-stress discharging, slower discharge=better battery life
- discharge level doubles with every 10°C (18°F) of increased enviromental temperature
Usage tips
- avoid extreme load conditions (applications using a lot of energy)
- avoid keeping a fully charged battery at high temperatures
- battery stored for a year or more will start "aging" - irreversible
capacity lowering - maintaining a Li-ion battery in a fully charged condition will shorten its lifetime
- store batteries charged at 40%
- replace battery if original level drops bellow 80%, battery will lose about 10% of useful capacity each year (whether used or not)
* Selecting a charger that uses minimum charge-current termination (C/10 or C/x) can also extend battery life by not charging to 100% capacity. For example, ending a charge cycle when the current drops to C/5 is similar to reducing the float voltage to 4.1 V (see fig.3 bellow). In both instances, the battery is only charged to approximately 85% of capacity, which is an important factor in battery life. The letter “C” is a battery term used to indicate the battery manufacturers stated battery discharge capacity, measured in milliamp-hours. For example, a 2000-mAhr rated battery can supply a 2000-mA load for one hour before the cell voltage drops to its zero-capacity voltage.
Types of Li-ion batteries:
Charging dependencies:
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