There is an appropriate way to charge a NiMH (Nickel Metal Hydride) battery. The process is moderately simple, but requires some familiarity with the manufacturer's instructions. While most chargers are easy to handle and operate, overheating can occur if special attention is not paid or proper use of the charger is not observed.
Instructions
1. Understand the efficacy of charging NiMH batteries. The coulometric charge potential for NiMH batteries averages just below 70 percent. This means that, on average, one NiMH battery requires 150 amp hours to produce 100 amp hours of energy.
2. Pick a charger. The Ultra Fast AA/AAA Battery Charger is manufactured by High Capacity, has a 4- to 6-hour charge time and can charge up to four batteries at a time. The 8- to 10-Hour AA/AAA Battery Charger is manufactured by Duracell and charges up to two batteries at a time.
3. Prepare the charge. Plug in the charger, then select the charging cycle; options can vary from "fast charging cycle" to "slow charging cycle" (see the manufacturer's instructions). Place the appropriate number of NiMH batteries into the charger and start the start timer. Finish by setting the safety timer backup termination feature, if applicable. Allow NiMH batteries to charge completely before removing.
4. Monitor the charge. The voltage in NiMH batteries will dip slightly when they are fully charged. An internal sensor will then signal a drop in voltage and end the charging. If this does not occur, or the device is faulty, monitor and check the battery for overheating at the end of the specified charge time. For example, when using the 8- to 10-Hour AA/AAA Battery Charger, be sure the termination technique has stopped all charging at the 8-hour mark or between 8 and 10 hours. Avoid allowing the battery to charge beyond this period.
Tags: NiMH batteries, Battery Charger, charging cycle, 10-Hour Battery, 10-Hour Battery Charger, batteries time