I just built a 7s 5p 18650 Battery pack. After charging it, it was showing complete 29.4V, but in two days, it's 27.7V with two of p's have only 3.5V. The BMS
7S Power Wall 29.4V 18650 Battery Holder 7S Battery Pack Balancer PCM PCB 20A 40A 60A BMS Battery Case for DIY Kit Ebike Battery | Wish
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Amazon.com: Sara-u 7S Power Wall Balancer PCB Module Power Bank Case 18650 29.4V Battery Holder 20A 40A 60A BMS Battery Box Protection Board for DIY Kit : Electronics
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STL file 7s 18650 Battery Holder for Jehu Garcia's Power Wall・3D printer design to download・Cults