14500 to 25500 Cell Adaptor

thingiverse

Human: The adaptor sleeve is designed to fit 14500 (AA cell) to 25500 (26650 = C cell) sized cells for use in devices meant for 26650 batteries. Note that 14500 cells have a fraction of the storage capacity of 26650 cells, and AA alkaline cells are not suitable replacements for C cell alkaline batteries. Using these adaptors is only recommended for testing or emergency situations. Not all 14500 cells have the same outer diameter due to differences in plastic shrink insulation used. Dummy AA cells and 14500 LiIon cells tend to be thicker than AA alkaline brands. Measured diameters are as follows: 1400mm (14mm ID) = cells with no plastic shrink insulation, 1425mm (14.25mm ID) = most AA alkaline cells, 1450mm (14.5mm ID) = dummy cells and LiIon cells, and 1500mm (15mm ID) = IMR with adhesive branding labels. Side note: The adaptor sleeve is designed for using 2xIMR/LiIon 14500 cells in devices meant to run off of 4xC cell alkaline batteries. This results in an over voltage state that can potentially damage electronics rated for a 6.6v ceiling, as 2x lithium cells rated at 7.4v typically peak around 8.4v on full charge when new. Internal protective circuitry may trip upon detecting an over voltage state (device won't operate). Worst case scenario: over voltage state can burn out components rated for lower voltage. In short, use in this capacity is at your own risk.