With GoPro and Gimbal, I get about 12 - 13 minutes flight time per battery. I have 5 solo batteries, and I get the same flight time from all 5, so that is what I would expect from a good battery. Sounds like your battery might need to be replaced. I have also read that you can reset the charging circuitry in the battery by holding down the battery power button while plugging into the battery charger. Worth a shot, I would say.