Batteries
Project batteries
5V 1A LIPO Charger Module with Protection - USB micro B (1A Charger USB microB)
Single-cell lithium base battery charger & protection module. The charging will be via a micro B connector. Lithium base battery includes Li-po and Li-ion battery as the charging and discharging characteristic is similar.
1.2V-4.8V and 9V Battery Voltage tester AN-168 (Battery tester AN-168 POR)
Place the battery between the two contact points of the battery tester.
The display will tell you immediately if there is the desired voltage.