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Parallel RC Battery Charging Board - $20 (Redmond)
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The built in LED display will cycle through showing the total pack voltage and then shows each voltage of each cell so you can track the progress of your charge. You can parallel charge up to ten 4s batteries all at once. Great for charging all your drone or remote control plane batteries quickly.
Feel free to ask me any questions and feel free to make me an offer.
(Battery not included. Battery is only shown to show the voltage function on the LED display.)