>> ... Yes, the biggest problem with Li-ion batteries is heat, which is produced by resistance during the charging process ...
Consumer-grade Li-Ion packs have regulation circuitry built in to each pack. Using the supplied charger, there's no "overheating" issue that causes pack degradation.
The issue of heat comes up when folks mistreat NiMH cells/packs. Many use standard-rate, non-intelligent chargers with NiMH packs, and the resultant heat will compromise pack longevity.
SOURCE: "Batteries in a Portable World" by the Cadex Corporation.
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