Join Date: Jul 2008
Location: Alberta, Canada
Bikes: Electra townie 21, electic conversion kit, Dahon folder ,Customized Nashiki
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I personally would go for the 36v10ah one. I work at an electric bike shop in Calgary, and for me, its not just about the weight. lithium batteries are going to have a longer battery life than the SLA batteries, so you shouldn't have to replace them as often.
However, taking a look at that website, EV power, I am not sure how keen I would be to buy a battery pack that is completely wrapped in duct tape.
For the distance, The ones that we sell at my work, the lithium polymer 36v10.5ah batteries go an average distance of 35-45 km on one charge.
If you were looking to charge at work, you could probably get away with a smaller batter pack, such as a 36v8.2ah, or a 36v5.6ah lithium polymer battery. the only downside to charging at work, is just bringing the charger with you. there are a few companies out there who provide you with rather large chargers that are not very convenient to carry around with you. you can get smaller ones though. Mind you it will also depend on how well the batteries are made. before you buy a battery from anyone, I would suggest finding out from anyone that you can, thier experience with those batteries, and if they preform to your standards.
As for the motor, be careful. I havent had alot of experience with BMC, but my store has not had the greatest luck with them. we currently have a geared BMC motor in the shop because while the customer was riding, all the internal gears became stripped, and seized. a few of the other bmc motors we have received, we had to take apart and rewire them to get them to even work. I have not heard what experience other places have had with these motors, and maybe we just have bad luck with them, who knows. so again, I would advise getting as much feedback as possible.