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    Building cylindrical battery pack for Dummy!

    After spending tons of money buying several Ebay 18650 cylindrical batteries (ping and lau's) that went bad after 6 months of usage (Lau and Ping V1), I've decided to build a battery holder to see if I could re-use some of the left over cell from those pack. I'm now only building A123 cells but...
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    700c vs 26"

    I've noticed that most are using 26" MTB bike vs bikes with 700c wheels (hybrid/road). I had both and like the 700c due to faster speed. The shock/bounce doesn't bother me too much - but is that the reason? Just curious?
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    Multi-port charging connector

    I have a 48v 20ah A123 pack and I use 16 voltphreak charger using anderson connector. As you can imagine, 16 pair of anderson connector is quite bulky. Does anyone know where I could find a smaller, multi-port connector I could use? Thanks.
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    Ebay BMS from CammyCC

    Hi, did anyone see this? - http://cgi.ebay.com/LiFePO4-12S-BMS-for-Electric-Scooter-E-Bike-Battery_W0QQitemZ170303279565QQihZ007QQcategoryZ11332QQssPageNameZWDVWQQrdZ1QQcmdZViewItem I've been buying Ping's (signa lab) BMS for building 18650 based packs and wondering if this is worth it. I'...
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    18650 battery holder

    Hi, I've started to work on creating a battery holder for 18650 and A123 cells. I'm fairly good with molding/prototyping, but not that good with battery/electronic, I would like to ask lots of question about how to arrange the holder for maximum modularity and efficiency (in terms of space)...
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    Clarification on BMC/PUMA

    I read all threads on BMC/PUMA and I'm still not sure what is what. It looks like there are 3 different geared hub motor from same factory/company? These are Puma, BMC 400w, and BMC 600w (not including 1000w as I understood that its a direct drive). My question is - what is Puma? I understand...
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    Ebay Lifepo4 pictures -JimmyWu's (pic heavy)

    I finally had a time to open up JimmyWu's battery and took some pictures - its a horror. First it took me about 1/2 - 1 hour to get the duct tape off - trying not to damage more. There were several layers of duct tape, then a plastic film, and back to duct tape down to raw cell. This one is...
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    How do I troubleshoot this one - battery or controller?

    I've just received a BMC motor with 36v 25amp controller. Once installed, I've connected a 36v Lifepo4 battery and worked fine. Then I've disconnected the 36v and hooked up a 48v battery - heard a sparking sound from the 48v battery (saw some smoke came out but couldn't see exactly where it...
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    Aluminum vs Steel frame

    I didn't want to hijack another posters thread, so I'm starting a new one. This was regarding Link using Schwinn S-40 for his Ebike. After seeing that, I've posted this, ---------------------------------------------------------------------- Link, Schwinn S-40 is an aluminum bike. No problem...
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    Cheap Lifepo4 - group buy?

    I'm not sure where to put this - so if this doesn't belong here, please move it to right section. Disclaimer - I'm not in anyway associated with this deal/vendor or getting anything out of this - I don't even want to be part of this - just passing information. I've recently bought a 36v-15ah...
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    Crystalyte Hub availability - who have it in stock

    Does anyone have a Crystalyte kit in stock? I've tried Ebike.ca and Bernson and they both are out. I've found some Wilderness brushless kit, but don't know if they could handle 72v. Do they match in quality? (to Crystalyte). I'm also looking at geared hub motor from TexasEv, but don't know if...
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    Combining battery to get higher Volt and AH?

    Hi, I have a another noob question, Is it okay to add different volt/ah in a serie? For example, I have a 36v 15ah lifepo. Will I be able to add 24v, 30ah battery to make it 60 volt and however many amp hours? Another scenario is to add same volt but different ah. I.e. 36v and 25ah (on...
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    Help with LifePo Battery - now what?

    Hi, I just received a Lifepo battery from one of the Ebay vendor. Well, problem is he left out couple of things with this battery - like connector to charge the battery or instruction. So my question is - how do I hook up a wire for re-charging? The battery came with 3 wire and its labeled as...
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