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Friendly Hobbies Power Stix 1S Charging Board
Specifications Weight: 36g ​Dimensions: 83x43x17mm ​Input: 3s - 4s Selectable Cutoff Voltage: 11.1v (3s), 15.1v (4s) Output: Fixed at ~400 milliamps 4.20v cell charging cutoff (+- 0.5% margin of error)