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  1. D

    Physical protection of naked AllCell Packs

    The BMS sense wires on my last 36V naked (protected only by shrinkwrap) AllCell battery shorted and caught fire a few months ago due to friction against my controller and banging against my rear rack while it was in my saddle bag. My newer packs are wrapped in foam and zip-tied. Has anyone found...
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    AllCell Battery Fire

    I've been using an AllCell 36V battery for the last 3 weeks and today it caught fire !! Towards the end of my ride. Using the CA3, 9C 1000W motor. Previously the BMS on the AllCell functioned properly and after discharging to about 33V would cut off power. Towards the end of this ride, it cut...
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    13s4p voltage sag - problems and questions

    Hello, I'm looking for input into my first battery building attempt: 52 cells, 13s4p, brand new Samsung 26F's Attached pic shows BMS but, BMS got fried during installation, so I'm running this with no BMS, using cycle satiator, and CA3 Series connections are doubled with pure nickel strip...
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    Charge / discharge lead

    Is there a downside to having just one lead coming off my battery for both charging and discharging ? Thanks
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    2 P- connections ?

    If my BMS has two P-'s and no C-....... do i need to connect to both P- spots ? 13s4p battery build, I'm looking to have just one lead for charging and discharging. BMS specs attached Thanks
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    BMS installation questions

    Hi I'm building a 4p13s (new samsung 26F's) battery and attempting to install this BMS on it (see attached). A recent video i watched showed a different BMS with the following soldering connections : B- P- C- However this BMS has a B-, and two P- connection points (pads?) Can someone...
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    acceptable voltage range for samsung lithium cells

    Hello, Just bought some new samsung ICR 26F cells from Ali Express. What is the acceptable voltage range for new cells? My multimeter is showing some at 2.90 and a few at 3.90 ! Can I just charge the weaker ones separately up to within the proper range before welding them together ? I'm...
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    spot welder question

    Hi - I'm buying a battery spot welder from aliexpress https://www.aliexpress.com/item/1-9kw-220V-Spot-Welder-709A-with-Soldering-Iron-Station-Spot-Welding-Machine-for-18650-16430/32614454614.html?spm=2114.13010608.0.0.FmEnsW Im in the USA. The seller has said they can send me welder with a UK...
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    charging questions

    Hello - I have questions about charging my home made 48V 13S lithium ion battery pack. Picture shows a broken power lead but that has been corrected. The pack has 26 individual cells. It was made by a friend, and with it he gave me a 48 V laptop computer charger. I'm attempting to use this on...
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    BMS for newbie

    Hello - I'm building a 48V system, with three different packs of about 8Ah each. Can anyone recommend a BMS to add to each pack to prevent overcharging / overdischarging ? Thanks !
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