I recently bought 4 AAA NimH batteries that are rated 800mAh each @ 1.2 V. I have a charger that charges 2 AAA batteries at 65 mAH with 2.8 V. How long do I need to fully charge my four batteries for use?
Depends on the charger. I bought a Radio Shack charger for my NiMH batteries (2000mAh @ 1.2V) and it said on the packaging that it takes about 12-14 hours to charge completely. I would think that if you were to put two batteries in your charger overnight, then the other two batteries in first thing in the morning, they should be completely charged within 24 hours... but don't quote me on that.
If you can find a link on your charger online (either through the original manufacturer or an online store that sells it) you should be able to find something that could give you more details on your charger. For example, here's the owner manual (in PDF) for my type of charger.
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