[Touch Pro, Fuze General] bauerpavel:
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 )

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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: