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Old 02-13-2013, 10:55 AM
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spog1
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Default RE: How to charge NiMH batteries



Those are excellent observations Mike for which I have no answer. I posted this stuff in the hope someone here can enlighten us on those details.
However,
There are other sources which claim the same regarding slow charging.
http://batteryuniversity.com/learn/a..._metal_hydride
It is difficult, if not impossible, to slow-charge a NiMH battery. At a C‑rate of 0.1 to 0.3C, the voltage and temperature profiles fail to exhibit defined characteristics to measure the full-charge state accurately and the charger must depend on a timer. Harmful overcharge will occur if a fixed timer controls the charge. This is especially apparent when charging partially or fully charged batteries.
Regarding newer technology, eneloop chargers are all peak detect and/or temperature based I believe, so it seems that timed charging may be bad for those too.
http://www.eneloop.info/eneloop-prod...r-manuals.html. Some of those however run in the dreaded .1-.3C range??