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 Storage - Battery Storage Boxes - AliExpress
7S 24V Lithium Ion battery BMS board Max 30A 60A constant discharge current for converter and 29.4V PCB circuit board of 18650 Battery – LLT POWER ELECTRONIC