Charging a rechargeable batteries

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Hi All,

I have a local brand hair trimmer (single AA battery) with me. I don't know what brand it is and how much amperage it gives to the battery when charging (but I'm sure its very low). This trimmer is working well with its own battery with which it came (the battery is plain, no texts on it, going dead for each use), so I'm planning to buy new rechargeable batteries alone now. My question is, can I just buy good batteries and charge them with this trimmer or buy a pack of good batteries along with its own manufacturer charger?

Please advise on this. Also, if I buy new batteries (say a pack of two), do I need to use them alternatively or I can use one until it dies and then start using another one? (If trimmer is used once in 4 days)
 
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Solandri
You need to find out what type of battery the charger originally came with. Different battery chemistries require different charging profiles. If you charge it the wrong way, it could catch fire or explode.

If you buy new AA rechargeables with their own dedicated charger, try them in the hair trimmer with a full charge. Different battery chemistries generate different voltages. So if the voltage of the new rechargeables is lower than the original, then the trimmer might not operate or might operate at a slower speed. If the voltage is too high, you may fry the electronics or cause a fire.

Try looking up your hair trimmer online, or ask the store where you originally bought it. Common rechargeable battery types are NiCd (1.2...
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Solandri

Solandri

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Jan 4, 2012
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You need to find out what type of battery the charger originally came with. Different battery chemistries require different charging profiles. If you charge it the wrong way, it could catch fire or explode.

If you buy new AA rechargeables with their own dedicated charger, try them in the hair trimmer with a full charge. Different battery chemistries generate different voltages. So if the voltage of the new rechargeables is lower than the original, then the trimmer might not operate or might operate at a slower speed. If the voltage is too high, you may fry the electronics or cause a fire.

Try looking up your hair trimmer online, or ask the store where you originally bought it. Common rechargeable battery types are NiCd (1.2 Volts at nominal charge), NiMH (also 1.2 V), or Li-ion (3.6-3.8 V, the new polymer ones are 3.2 V). NiMH is the most common in recent years for this type of application. If you determine that it is in fact NiMH, I would recommend the low self-discharge models like Sanyo Eneloop. Regular NiMH can discharge to 0% in a month even if you don't use them. The LSD versions can hold their charge for 1-2 years in storage.

If the trimmer is designed to take alkaline (non-rechargeable) AA batteries in an emergency, then it's almost certainly NiCD or NiMH. Since they have the same nominal voltage, they can be used interchangeably. But I would not trust the trimmer's built-in charger unless you know you bought the same type of battery. Use an external charger that came with the batteries instead.
 
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