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Zapping Nicad and NiMh batteries improve their performance under really high current drains (more than 35 amps), so it is used for competition. Here's some info.

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NiCd and NiMh batteries |


SEFSD newsletter with zapping info (PDF file)
A description of what zapping does and some photos and circuit diagrams.
Zapping site (GERMAN)
A german site with a circuit diagram and photos. (Courtesy of the Wayback Machine)