4.2V Battery Case
1. Battery case holder for 4.2V 18650 batteries.
2. Lightweight, convenient to carry. Keep your batteries organized and protected.
3. Easy to install, you can easily to put the battery in it.
4. You can use this case with your own battery to form power system supply.
5. Battery is NOT included here.
Instructions for use: 2 single 18650 battery 3.7V.