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NiCad and NiMH batteries are amongst the hardest batteries to charge. Wheras with lithium ion and lead acid batteries you can control overcharge by just setting a maximum charge voltage, the nickel based batteries don't have a "float charge" voltage. So the charging is based on forcing current through the battery. The voltage do do this is not fixed in stone like it is for the other batteries. NiCad and NiMH batteries are amongst the hardest batteries to charge. NiMH batteries can require anywhere from 3 to 6 or more full deep and slow charging cycles before reaching their peak capacity. Wheras with lithium ion and lead acid batteries you can control overcharge by just setting a maximum charge voltage, the nickel based batteries don't have a "float charge" voltage. So the charging is based on forcing current through the battery. The voltage do do this is not fixed in stone like it is for the other batteries. If you need or prefer using a fast NiMH battery charger, it is important to use a fast charger that has been designed to charge quickly without overcharging or causing excess heat. ome cheap or poorly designed fast NiMH battery chargers will decrease the battery life by overcharging or generating excess heat. These are caused primarily by:* Not detecting the “End of Charge”; and,* Continuing to charge at a high rate.* Some NiMH Batteries cannot handle high charge currents; and,* When heat builds up, the NiMH Battery Charger fails to take appropriate action.=== Brand Names === * Sanyo eneloop