I've just bought an OEM factory refurbished P3P battery, it came with 3 lights when tested so I charged it up and flew, according to airdata it had a few minor deviations in 1 cell, the next flight it had slightly less deviations, now I've had 4 flights with it and hardly any deviations at all so I think it needed to be recharged a few time to get it up to normal, when it came there was no marks on it at all still had the stickers on the button it looked exactly the same as my origianal one it cost about £53.00 so I recon it's a bargain
.https://www.ebay.co.uk/itm/Original-DJI-Phantom-3-15-2V-4480mAh-Battery-Professional-Advance-Standard-4K/274295125114?ssPageName=STRK%3AMEBIDX%3AIT&var=574393428188&_trksid=p2057872.m2749.l2649