Recent content by bobotic

BTW... The only argument against Lipo I seemed to found, or at least most prominent, is "you'll burn your house down" which from my perspective is akin to "you'll shoot your eye out kid" coming from the RC space. Way back when Lipo and electric for that matter was just becoming more and more...

That looks pretty good, and trust me if I had $850 to spend I would probably buy a pair and probably would have spent a little more to get LifePo since it seems like the best money in the long run, especially if you run at least 20ah. I came to the conclusion that I couldn't afford it now and it...

You took my statement out of context. I was basically asking if there are decent solutions to bulk charge healthy and balanced packs. If this was for 3S or 4S I would already know the answer, I just haven't ever charged anything 48v, I don't know what type of chargers are available and...

Do you have a link for a US supplier using 18650 cells? I couldn't find one. If the prices between those comparable I would definitely go with Li-Ion, but everywhere I checked it was overseas delivery or bust. IIRC I think I found a listing for someone building to spec but they were mucho...

From everything I've read LiPo is clearly the way to go in terms in power density, current output and price. But that is only half of the equation in a production vehicle, be it a bike or a car. Things have to be as maintenance free as possible also. LiPo does not fit that half of the equation...

I was under the impression BMS and another retailer I was looking at were US based because they were on a list of US suppliers I found somewhere. I can't really afford any of the Li batteries I've seen available from US suppliers so far. If anyone knows of one selling a 48v15ah for around $300...

Sorry, I was mistaken... I thought BMS was selling a NMC battery but it actually appears to be LiPo (Li-Ion NiCoMn). The chemistry listed is what made me think it was NMC at first glance. Edit: I was also mistaken that BMS was a US retailer. I have never seen a Chinese supplier have a website...

Thanks everyone, great info. I'm definitely trying to find that right buffer between upfront cost and lifetime value. Lead is out of the question. The lithium packs from China have a price I can live with, but it is a crap shoot, but even more importantly I don't see myself waiting up to two...

Does anyone have any recommendations on sourcing laptop batteries? Is it better to go with the new (non-oem) replacement packs, used packs, or?? So far I have found some new ones, 6 and 9 cell, for around $10 - $13 each. There is 11.1v 9 cell (it was rated 8200mah IIRC) but someone who actually...

I'm bought a pair of the 48v 1000w hub kits you see on eBay. In hindsight I probably could have got away with a 36v or a 48v 500w, but it wasn't much more for the extra power in case we decided we needed it at some point. We will be riding flats mostly and likely 15 mph cruising speed and mostly...

Hi, I've been reading quite a bit on this subject, here and elsewhere for a couple days. As someone relatively new to EV (e-bike to be specific), the information and choices are daunting... SLA, LifePO4, NMC, flat foil packs, round cells, building from hobby LiPos, etc. What's tough is some...