Description: Take a 3000 mA battery for example, the 3S 1P battery box full of batteries the capacity is 3ah, 3S 2P is 6ah, 3S 4P is 12ah. and you can stack the number of battery boxes according to your actual needs. 3S charge needs 12.6V charger. It is recommended that the charging current of each layer should not exceed 2A, otherwise the battery may become hot (for example, choose 2A charger for only one layer, and 4A charger for two layers). Do not put on the metal table top to use, pay attention to insulation do not short circuit. The battery faces up the circuit board, all the batteries face the same cannot interleave.The direction of battery installation is subject to the mark on the cirucit board, not the mark on the plastic battery box. Specification: Material: Plastic Voltage: 12.6V Size Chart: 8x14cm/3.15x5.51inch Package Includes: 1x Battery Holder Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful on-line shopping!