This little adaptor enables the user to charge 2 similar 2S batteries from one charger with a 4cell jst-xh socket. It charges through the balance plug on the batteries.We do still reccommend that you monitor your batteries at all times during charging and do not suggest using this device on some of the cheaper budget balance chargers. Only use similar packs with this charge board. For example, DO NOT charge a 3s 500mah pack and a 3s 2200mah pack. Only charge the same packs from the same brand, eg Hyperion 3s 800 and a Hyperion 3s 800.
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