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What are the differences between NiMh and NiCd batteries?
Dewalt cordless tool batteries are NiCd, or now, Lithium ion. Some companies make NiMh battery replacements that seem to work as well or even better than the NiCd's in my tools. Why doesn't DeWalt make NiMh replacements? I asked them to no avail. NiMh batteries can stand many more charging cycles from what I understand and are used in walkie talkies and cameras. Why not power tools?
I would tend to agree nimh are better, but why don't the tool manufacturers use them? They only offer nicad and lithium. Is there a difference in the maximum discharge current available for heavy loads? p.s. For at least 4 years now DeWalt has recommended charging nicads as soon as they start to lose power, and never wait until they are fully discharged. Same for B&D.
3 Answers
- zqert988Lv 61 decade agoFavorite Answer
Nicad's had severe charge "memory" problems. Short charging would leave the battery unable to take a full charge again greatly reducing the life.
http://en.wikipedia.org/wiki/Memory_effect
Cycling any rechargeable battery from full charge to near no charge state then recharging to full, is the best way to maintain it for long life.
Nimh:
http://en.wikipedia.org/wiki/Nickel_metal_hydride_...
Nicad:
- Anonymous1 decade ago
NiMh batteries are far superior. They do not suffer from the "memory effect" and have better charge lifetimes.
