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        Q: How long do I charge a Li-ion battery for the Sidekick 2008?
A: up to 6 hours the firstly time 

Q: Why did battery manufacturers change rechargeable AA batteries to 1.2 volts when they should be 1.5 volts ?
A: Get a `` battery charger '' . Its usually used with automobiles or motorcycles when the battery is deceased to recharge it . 

Q: How much will this 6 li ion battery last?
A: Probably you wish to know , how longer you are able store battery , once you make full charging , till charging drop to bottom ( sensible ) limit .  First - I do not recommend store Li-Ion battery , charged on 100 percent , for long time in room temperature !   High charging tiers and elevated temperatures ( whether from charging or ambient air ) hasten capability losses .  A Standard 18650 Li-ion cell ( which utilized , inside of your battery packing ) , what 's full most of the time at 25 °C ( 77 °F ) , irrevocably loses roughly 20 percent capability per annum . That is also depend of maker and construction technology . Poor ventilating may rise temperatures , further shortening battery life . Loss rates differ by temperature : six percent loss at zero °C ( thirty-two °F ) , 20 percent at 25 °C ( 77 °F ) , and 35 percent at 40 °C ( 104 °F ) . When stored at 40 percent –sixty percent charging level , the capacity losses were of reduced two percent , 4.0 per cent , and fifteen perper cent respectively .  Batteries may last longer if not stored completely discharged . As the battery will self-discharge over time , its voltage moves forwardively decrease , and when it is depleted below the low-voltage threshold of the protect circuit ( 2.4 to 2.9 V/cell , relying on chemistry , primarily is that threshold about 2.7V ) it will be disabled persons and were not able be discharged any further till recharged .  Recommended charging to store batteries is 40 % of charging level - in fridge ( temperatures closes to 0 , but not below ! )  You also should verify battery at the very least every three months ' time . If charging going too closes to 2.7V per cell ( if your battery packing is nominal voltage 11.1V was later threshold is 8.2V ) you have to charge it back .  So it would be better 's using battery packing from firstly moment of purchase , than waste money for spare battery , which wo n't last long .