Resurrecting dead DJI batteries

[Mechanicus_95]

I recently bought a DJI Phantom 4 pro. Have three batteries but only 1 works others don't charge. Looks like they were left uncharged for about a year. Any recommendations how to get them back in operational order? I have a bench top lab power supply. Was thinking of applying 15 volts at 1-2 amps for an hour and seeing if that kicks it back into gear. But want to check first if that's a good way of doing it or if I'm missing something else....

 

[crash1sttime]

batteries go into hibernation mode if left to discharge, battery killer does some of them such as the spark and mini batteries not sure if it does the p4 bats though my video guide has the software

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