18650 standard laptop lithium ion battery cell

Dimensions in inches:  2.56 x 0.315 inches.  Wikipedia: List of Battery Sizes

The 18650 lithium cell battery can be purchased for on the order of 1 dollar per cell on ebay.  This makes it very attractive for fixes to devices whose battery packs have died.  Also of interest is the fact that since the lithium cell voltage is 3.7 volts less cells are required to replace a NiCad pack. This means that in many cases there will be sufficient space for the lithium cells to fit in the old battery pack.

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Categories: Engineering

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