If you don’t shoot ttl and set the flash to minimum you can extend your battery life considerably
Unfortunately small cameras tend to have smaller batteries and life is not so good. If you are after more battery life you might like to consider other m43 cameras. The GX85 battery is 1025 mAhr, I had an EM-5MKII with 1225 mAhr battery which would do 3 dives and probably 150 images or so. I now have an EM-1 II which has a 1750 mAhr battery, yet to test it out but has loads of battery capacity after 2 dives taking 100-120 images.
Video and TTL will kill a small battery in less than two dives from what i have experienced
Sent from my iPhone using Tapatalk