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SLK Electronics has a piece on their site about breaking down a DeWalt 36V A123 high-power Li-ion batteries to make your own battery configurations. This (and several other related articles on the site) is gear towards electric model planes, but is obviously applicable to any application.

Dissecting DeWalt 36V Packs (A123 Systems) – [via] Link

Related:

  • Li-ion Life Extension – Link
  • HOW TO rebuild a Li-Ion battery pack – Link
  • HOW TO – Refilling laptop batteries – Link