Description: High current wiring-can be tinned to enhance. Full-chip high-current protection board. Support multi-layer balanced flushing. 92-95% conversion efficiency. Integrated design of flushing and releasing.Multi-layer overlay design. Specification: Name: 7S power wall Size:17x9cm/6.69x3.54inch Current: 20A 40A 60A Voltage: 7S full of 29.4V Weight: 178g Direction for use: 1.Check whether the product is in good condition before use. 2.Put it in the battery and use it when fully charged Matters needing attention: The 7S requires a 29.4v charger. Do not use it on metal table top, pay attention to insulation and do not short circuit. The charging current of each layer is not recommended to exceed 2a, otherwise the battery may generate heat (for example, if there is only one layer, choose 2a charger, and if there are two layers, choose 4a charger). The direction of battery installation is subject to the mark on the cirucit board,not the mark on the plastic battery box. Don't connect the power supply with the wrong positive and negative, there are signs on the circuit board, pay attention to observation. Product single circuit board option, excluding the battery in the photo. Package Includes: 1 Set x Battery Holder Protection Board Kits (Not include the balance line shown in the picture) 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!