I have been looking for a set of batteries ps12120 sla for my new kit poject an old shooper 36v sla rw motor with full electrics, lights, indicators, horn just need to find a bike to fit it two.
And came across the Dewalt DC 36 VOLT (A123 Systems) LITHIUM - ION BATTERY PACKs with 30 amp continues. (The M1cells per the manufacturer's designation) are promised to last longer than LiPo and tolerate more abuse. They should last longer than NiMH. Another real savings consideration is in charge times 30 to 60 min, these are used for power tools but I have seen a video on the net
YouTube - Ultimate hybrid electric bicycle with them used for ebike they allso look fairly easy in Building Packs
DeWalt 36V Technology (A123 Systems)
allso found this forum which has some good info
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sorry posted this twice.