If you are still active here, could you please elaborate a little bit on that?Hi. I just revived a dead battery which had sit in the drone without usage for more than 2years. Basically you need to connect two aa batteries together (to get 3+ V) and connect them to the left pair of connectors on the battery. And then plug in charger (on top of your construction). This tricks charger to think your battery is fine. In couple of minutes you can disconnect your 2 aa batteries and continue normal charging.