My friend is a "balls to the walls" newbie. Just looking for some baseline input for him to monitor batteries; OEM and otherwise. Which brings up my question, what would be the minimum cell voltage one would arrive at to begin seriously thinking about ending flight depending on distance etc from home? i.e storage voltage vs minimum inflight voltage. I've been using 3.7 or 3.8 for storage for my winged aircraft batteries. .
As "msinger" says - the battery line on GO shows the H and Critical points on the line and H point varies depending on straight line distance to home. IMHO - you should never push far enough that you hit H to turn back to home ... you should be on way back well before that.
Storage - yes all LiPo's as you state are good for 3.7 - 3.8V ... that's spot on the sweet spot. Regardless of DJI or not - 3.75V is excellent. Trouble is DJI batterys do not fully stop discharging until they hit Hibernation ... so to avoid that its good to charge up to reasonable level once a month or so ... and let auto discharge do its job.
For example my 'system' for my DJI packs ... (based like you on general LiPo usage ... I currently have LiPo's from 1S up to 6S in sizes from 100 up to 6000mAh).
Charge up to full and have Auto Discharge set at 3 days.
If I don't fly immediately - but next day or later - I switch on battery and top-up charge for flight. I usually land with 30 - 35% still in battery, that is fine for storage as battery rests and recovers to about 40%.
If I am not going to fly for a while - I leave as is and just periodically check levels. As long as I have 1 +1flashing or 2 LED's - I'm fine. If I have 1 LED - I then give a full charge and let it auto discharge again.
So lets say I don't fly for extended period - and battery sits from full going into auto discharging. That's fine - I let it do its job and every month or so check level and charge up to initiate auto discharge cycle again.
I do not like the idea of entering Hibernation mode.
That's my way ... seems to work as my batterys still perform well as when first used. That includes DJI and non DJI packs.
Others will of course have their ways ... we all believe we have the right way !
Nigel