Electric Bikes - Need help adding a battery
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02-20-12, 09:46 PM
I own an izip urban cruiser, 24v 10ah lithium battery located in the down tube, 250w rear hub motor. It has a simple peddle assist system that senses torque and get between 15 and 18 mile range on a single charge. My commute to work, however, is about 25 miles. I am looking to add a battery to extend my range. Is anyone familiar with this bike or done a similar project?
I am thinking the Ping 24v 10Ah LiFeP04 would fit nicely on a back rack and give me what I need as far as range. I could probably figure out what connectors and switch would work but any advice or tips are welcome.
Seal Beach, California, USA
Here is a schematic:
Ping batteries are excellent. They do need to be "babied" - and by this I mean not put in a cooler bag, as the BMS will overheat. The BMS needs air circulation or at least some venting. Like a homemade wooden box with outlets for air. I like wire mesh steel office trays zip tied into to the rear rack, with the Ping in a waterproof Plano marine tackle box bungied into the tray "snapping in", with a waterproof pannier cover in black over the whole assembly, for stealth/security. The tackle box is predrilled to let air from the battery compartment into the upper lid compartment of the tackle box without letting water in. I also "unplasticated" the BMS from the way it is sold, and treated it with conformal spray, as well as putting padding inside the box to shield the battery from impact, but not cover the BMS. I've got 4000 miles on the bike since I got the Pings and they are working great. I also keep the depth of discharge below 70 percent, just to be nice to them. The more battery you have watt-hour-wise, the more cycles you will get out them as you will have some overkill which enables a more conservative usage pattern. I like the LEDs which come on. They are comforting.
02-23-12, 10:41 PM
Thanks for the help. Do you have a photo? My plan was to throw the battery unit in a cooler bag on the back rack with some venting but it sounds like keeping the BMS cool is key.
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