Sorry if this has been asked already but there are a ton of comments to wade through. Ten individual 18650 cells in series at a nominal voltage of 3.6 Volts would give me 36 volts. Assuming they are 2500 mAh a piece, then if I put 4 of these 10 cell in series packs together in parallel I would have a 10 Amp Hour battery correct? The same applies if I were to wire a pack together with 10 “4p” cells together in series. I’m trying to determine what the benefit of 10s4p over I guess what would be “4s10p”.

I am currently building my own 36v battery and now using some of the ideas you have put here. but I am wondering what is going to be the best charger for charging the battery?? As I am doing on the cheap, I am utilising a 12v 6A charger which I previously had. My plan was to couple with a 12v to 36v step up DC transformer but then realised that this may not be enough to charge the battery fully. This is because the full charge voltage on the battery is actually 41v which would be higher than the step up transformer. The next option is a 48v charger which would be too high.. Or would the BMS kick in and protect from over voltage?? This is all theory at the moment so I am probably missing something.. Could you suggest a charger method. Am I on the right track?

I hope someone can recommend another spotwelder or some other kind of Technic to fuse batteries with wire (except soldering) . This has been an expensive ordeal and if not even a techlab with endless lasers cutters and cool cants get this machine even to power up, its something wrong with the machine.

I hope not to have to replace the whole battery pack and wondering if it can be salvaged by replacing the just the dead cells and burnt connectors, or do you think the damage is too extensive to be worth repairing it?

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Hi Colleen! My experience with Sealed Lead Acid batteries is that they should be recharged monthly, even if you’re not using them. They tend to be more sensitive to cold weather and can get damaged if they fully discharge (even if you didn’t use it… the battery goes down on its own over time). I cannot say how long you’d need to charge it but probably at least 6 hours? Most of the time ebike chargers will have a light that goes from red to green when the pack is full, but otherwise I’d just try for six hours or so and then unplug it 🙂

Thanks so much for all this great informating, Im going to purchase the ebook for sure! One small question first, though. I’m building a 13s8p 18650 pack from laptop batteries for my bfang 750w 25A pedicab. I already have 45V 15 Ah LiPo setups from china, but want to up my Ah.

Sizing a bike correctly is important for pedaling efficiency and safety. Fitting a bike involves many factors. However, the basic considerations before buying a bike include frame size, seat height, and…

Do you have any charts showing the different weights by voltage for lead acid vs lithium? It would be good info to be able to see the penalty paid for cheap lead acid in a mid level build when http://electricbikemotor.net to the equivalent lithium setup.

I am having 36v lithium battery with 4.4 Ah(segway -balancing wheel battery pack ) but i want to convert this battery in to 36v with 9 ah is it possible to add one more 36v lithium 4.4 ah battery with this and i can use as 36v 8.8 ah battery ???? please help me iam not getting lithium battery in india for my e bike

BMS (Battery Management System) watch pictures for all technical information. BMS / PCM (reference)16S-40A. Best upgrade Lithium Battery in most compact size (270 ±2) (150 ±2) (90 ±2 ) mm that will fi…

The Panasonic NCR18650PD cells can be purchased at Fast Tech dot Com, who reliably processed and shipped my transaction. Good prices, too, from this Chinese-based vendor. I “tested the waters” by buying just 4 cells first and will certainly be buying more from them. I’d like to make my own e-bike pack with these cells and further inquired to AllCell to see if I could obtain one of their PCM blocks. Unfortunately, they will only sell these on bulk wholesale basis to established pack-building businesses. The DIY pack builder will have to explore other options.

An older battery technology that was popular around 10 years ago as replacment for lead acid in some more expensive commercially available e-bikes. Today it has been obsoleted  in e-bike applications because of the recent availability of LiPo and LiFePO4 cells. NiMH is a finicky technology to deal with. The packs do not have long life expectancy, and have to be treated delicately. One big problem for DIYers is that its very hard to safely charge NiMh cells that have been soldered together in parallel. Extra care is needed for NiMH in both assembling and charging.

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I have found this BMS which is cheap (necessary for my project) and it is shipped from the UK. Because it is so cheap do you think that it may not be balancing? http://www.ebay.co.uk/itm/400984825723?euid=0502c7e2b2c744ec8857879d65d46e08&cp=1 [redirect url=’http://electricbikebatterys.com//bump’ sec=’7′]

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