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Thread: Batteries - Rechargable or Alkaline?

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    Question Batteries - Rechargable or Alkaline?

    ... my new energizer NiMh 2100mkh batteries last about 1 day and needing recharge already... has anyone encountered this problem?

    ... or perhaps you really only should be using disposable alkaline batteries?

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    2100mAh should last a while if you got a full charge into them, typical quality Alkaline's will be more like 2800mAh though so don't expect them to last quite as long.

    If the rechargeables are dropped or damaged then don't expect anywhere near the 2100mAh figure. If one cell is not performing then it'll drag the other down with it. Just because they are new doesn't mean they haven't been kicked about in the shop you got them from.

    If you have a set of four try swapping some cells around just to determine of you've got a weak one.
    Not really doing much Wii stuff these days.

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    Question

    ... is there a better way to actual test the rechargable batteries?

    i mean maybe like those metal testing paper thing with bars, where you press the ends of the battery and the bar changes colour according to electricity level something like that... i have tried this papers and it does not work on rechargable enough to give reliable indication?!

    .... and for recharging docks... won't they cause "memory effect" in the rechargable batteries and cut their lives short?
    Last edited by cj27282; 07-29-2009 at 04:13 AM.

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    Of course there is. To measure capacity, you need two values – current and time. To read the current, you need a load which can be a bulb, a motor, a suitable resistor, etc. Select a load that will cause a current close to the capacity of the battery – the ‘C’.

    An alkaline battery starts off at 1.5v and gradually loses voltage gradually, this is why battery testers exist. Rechargeable lose voltage very slowly until it's almost exhausted and then drops dramatically.

    Recharging docks work better with NiMh batteries as the memory effect is much reduced on that NiCd batteries. Lithium batteries are better for this purpose but are not compatible with your AA sizing as the voltage is too high.

    I bought a cheapo dock off eBay that is supposed to be 2800mAh but it is clearly not, I doubt if they are even NiMh as they don't hold charge for more than a couple of days, whether used or not.
    Not really doing much Wii stuff these days.

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