I am however encountering problems in finding a BMS for my pack which will be 2 or 3 P and 7 S to replace 24V 6 AH in frame battery pack. Can you please enlighten me as to where I can access a suitable BMS. Thanks for any help. K.
The single best manufacturer is BesTechPower, but their BMS’s are really expensive and they have a minimum order quantity of 2. For ‘best bang for your buck’ BMS’s I’d recommend Greentime BMS’s. They are great for most ebike applications outside of serious hotrods and speed machines. I use them on most of my packs.
Thank you so much for taking the time to write the battery chemistry article. I am looking at buying my first electric bike, and needed to understand the differences in LiOn batteries. There are still retailers selling SLA battery pack bikes and wasn’t sure if that was what I wanted, or LiOn. Your article helped me greatly.
With a budget in mind, here is a 36V charger (output 42V, exactly what a 36V li-ion pack needs) that I have used and found to be a good budget charger. It’s not super fast, at only 2A, but for just $20 shipped, it’s a great deal. You might have to wait about 3 weeks for it arrive from China though. http://www.aliexpress.com/item/100-240VAC-42VDC-2-0A-Lithium-LiPo-Battery-Charger-E-Bike-charger-suitable-for-10S-36V/559929087.html
The biggest advantage of lead acid batteries is their price: dirt cheap. Lead acid batteries can be purchased from many different online retailers and local stores. Purchasing SLAs locally helps save on shipping and makes them even cheaper. Many hardware and electronic stores carry them. Even Radioshack has them, though you’ll pay more there.
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But having read through the document mostly, not completely, I simply stopped reading further due to incorrect usage of words and many bad spellings, some of which would not be caught by a spell checker – “table” for “stable” for example.
I would not recommend trying to use a 36V charger. The voltage will be way too high and damage either the charger, battery, BMS or all three. Always use a charger that is matched to your pack’s actual charge voltage, which in your case is 22.2V batteries for electric scooter Terms: Electric Bike Technologies LLC reserves the right, in its sole discretion to cancel, terminate, modify or suspend the Sweepstakes should (in its sole discretion) a virus, bugs, non-authorized human intervention, fraud or other causes beyond its control corrupt or affect the administration, security, fairness or proper conduct of the Sweepstakes. In such case, Electric Bike Technologies LLC may select the recipients from all eligible entries received prior to and/or after (if appropriate) the action taken by Electric Bike Technologies LLC. Electric Bike Technologies LLC reserves the right at its sole discretion to disqualify any individual who tampers or attempts to tamper with the entry process or the operation of the Sweepstakes or website or violates these Terms & Conditions.
The main limitation of those holders is power – they can’t handle it. For a few amps, they might be fine, but ebikes require dozens of amps, which would surely melt those guys. Think about it this way: professional ebike batteries have big hunks of nickel plate welded between cells. The tiny little spring contacts of those holders will never compare to that kind of current carrying ability.
BesTechPower makes some of the best BMS’s in the industry. You pay for that quality, but I believe it is well worth it. I haven’t used that specific BMS you linked to, so I can’t give you specific feedback on it. I haven’t done very many 7s packs, as that’s on the lower end for ebike use. The few I’ve done had some cheaper BMS’s and not the two wire design I mentioned. Sorry I don’t have any specific recommendations for you – it’s just a lower voltage level that I don’t often use.
Most inexpensive NiMH packs are not really designed for discharges greater than 1C. That means that if your ebike draws 15 amps on average, you would want a pack that has a capacity on the order of 15 amp-hours more.
A High-performance Motor acheives a top speed of 20-30km/h with a range of 20km means your ebike commute just got easier. Folding style, portable convenient, easy storage. You can lock your bike by ap…