Since the late 80s, the NiMH battery has steadily improved.Some of the distinct advantages of this battery are:
- 30% more capacity over a standard NiCd.
- Less prone to memory than the NiCd. Periodic exercise cycles need to be done less often.
- Fewer toxic metals. The NiMH battery is currently labeled “environmentally friendly”.
There are some downsides to the NiMH batteries:
- NiMH batteries are rated for only 500 charge/discharge cycles. Shallow discharge cycles are preferred for this battery. The battery’s life is directly related to the depth of discharge.
- The NiMH battery will not accept fast charges. The recharge time for the NiMH is typically twice that of the NiCd.
- The NiMH battery will self-discharge at a rate of about 15-20% during the first 24 hours and then 15-20% per month thereafter.
- The price of the NiMH is about 30% higher than the standard NiCd, but delivers higher capacity in a smaller size.
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