Battery Tester (2 Pack), HAOBAOBEI Universal Battery Monitor Checker for AA AAA C D 9V 1.5V Button Cell Batteries, Small Electrical Equipment Battery Life Level Testers Power Meter (Model: BT-168): Amazon.com: Electronics
Small Size High Capacity Lipo Battery Cell Lir 1054 Lir 1254 3.7V 45mAh Rechargeable Lithium Polymer Button Battery - China Lithium Battery and Button Battery