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Your advice is greatly appreciated. The batteries I have were all bought from the same supplier at the same time from Ebay. I cannot guarantee the batteries came from the same factory but they all look identical. The battery packs had good reviews. And the voltages of the cells are within .01v...

I am aware that there are a lot of fake, sub-standard batteries out there, it is a minefield. I will be checking the cell capacities over the next couple of days.

Hi, I put together these drawings on my computer to illustrate how I plan to spot weld the cell groups together based on the photo John Jones posted recently on this forum. I would be grateful for your comments. Hopefully I haven't made any mistakes. Any improvements or corrections to my battery...

Thank you for the prompt reply. I found the information you supplied very useful.

Thank you so very much for what appears to be the solution to my problem. This is exactly what I've been looking for. I have tried so many different cell combinations myself without being totally satisfied with the layout. Once again, you have my sincere gratitude and have possibly saved me many...

Hi, I am a sound engineer by trade and mainly work with live bands. I own a motor vehicle but I got into e-bikes just before the first lock-down(UK). I have a GT Avalanche 3.0 donor mountain bike and have a Bafang BBSHD mid drive motor, full colour display, narrow/wide 46 tooth chain ring...

It wouldn't surprise me if some people considered me a novice, as I've only been building batteries for about 6 months now. The spot welder I used was one I built myself out of microwave oven parts and a few additional components from amazon and ebay. I really wouldn't know what to recommend...

Thank you for your reply, I have about six months experience spot welding cells together , which probably isn't very long in the scheme of things, but I am confident enough to 'go there'. I understand that there may be serious implications if 18650 lithium ion cell battery packs are not...

I have a complete knowledge and understanding of the difference between connecting battery cells in parallel, series or a combination of series parallel. And just so you know, I have spot welded many 18650 cells together successfully with nickle strips. I was not asking how to configure a...

Hi everyone, I've recently bought a battery case, but i don't know the best way to arrange the cells into the two cell holders that came with it. Is there an app that can arrange them for me or is there someone that has the same or similar cell holder? As the title says, I need a 13s7p, 52v...