Can anyone tell me what the internal dimensions are of the battery housing? I'm looking to retro-fit my existing battery with LiFePO4 but haven't figured out what dimensions I will need.
The basic internal rectangle is 304 mm x 99 mm x 64 mm Wayne.
The uppermost 80 mm of the rectangle widens from that 99 mm to 109 mm.
You'll be hard pushed to fit in a LiFePO4 cellpack and BMS though unless of smaller capacity, since the cells are larger than Li-ion for a given capacity.
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Several people have though of doing this Wayne. Expert opinions seem to say LiFePO4 cells won't fit the standard case and it may not be worth the time and effort.