TP4056 Module are charge board very nice work and cheap for laptop cell batteries 18650 4v2 1 Ampe
Solar mini module 6 Volt 4 Watt or 6 Volt 8 Watt best choice for 2 or 3 cells 18650 - Laptop cells 18650 from
2000mAh to 3400mAh very lot on Ebay, Please check which batteries are good though checking how well the cell
can discharge, and how long the cell can keep its charge,
Battery Holders, Led for test .......