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03-02-2011, 10:59 PM   #16
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QuoteOriginally posted by twitch Quote
in fact the higher the mAh the worse the performance in the K-x, strange but true.
This may be related to the type of charger being used and I think I may have an explanation, at least for basic inexpensive AAA/AA NiCd / NiMH chargers.

If you have a battery charger with advanced features including the capability to charge a single battery and monitor current, voltage, battery temp, etc. then the explanation below may not apply.

Most chargers, especially basic ones, charge batteries in pairs connected in series and apply twice the voltage of one battery, which is ~2.4-2.6Vdc. These will not allow you to charge one single battery at a time. The problem with these “series” types is that they cannot detect that they are charging two batteries in series, let alone determine the condition of each individual battery. Even if Batt-1 is already charged 100% while Batt-2 is still at 50%, the charger considers it as one cell that hasn’t reached full capacity and will continue to charge.

Since Batt-1 is already fully charged, it will have to dissipate the extra charging current in the form of heat, which is bad for the battery, while waiting for Batt-2 to reach full capacity. The longer the remaining charge time for Batt-2 to reach full capacity, the longer the “abuse” to Batt-1. Since high mAh rated batteries have longer charge time, the abuse time will be longer, eventually resulting in poor performance. Low mAh batteries require less charge time, therefore the abuse time is shorter and the batteries will have a longer in-service period.

03-02-2011, 11:44 PM   #17
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High mAH comes at the expense of charge retention and comes with high internal resistance which makes them unable to maintain their voltage under load.

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