Thanks for your advice. Unless there is a device that charges them only to storage level, that would require 'baby-sitting' each battery in turn... I guess it can be done, I just have spend much more time and effort doing that than I am right now. Thanks!
Seems like a good and careful routine. I have had 4 batteries go bad with swelling. The fault is not with our care of them but with a flawed DJI product. Have you tried getting a refund on the bad batteries?
A lot of photos & back-and-forth queries on the first 2 swollen batteries. They were so swollen I didn't want them in the house as figured they might catch on fire or explode. Tossed them at a battery disposal place when I thought DJI had agreed on a refund. But Then DJI insisted I mail them the dangerous batteries! So all the effort for nothing.
U dont need a device to charge them at storage level. What i do is fly till 30% sometimes 25% i just stop flying by then in flight your voltage is 3.6 v across all 4 cells this is because u are in flight and using the lipo so why fly any lower? Not really good for the battery anyway. So i land at 25% (remember in flight voltage was like 3.6 to 3.5v per cell which is low) but when u land resting voltage is 3.75 to 3.80 per cell which is great and is whats called "storage voltage" ......so simply just flying to 25% and stopping u can put your battery away. It will be at storage charge. Now if you are not going to be flying for a couple of weeks you should check on the batteries because they slowly lose charge so if you're gone for a month you might come back to a 0% battery.... you do have to check them if you're not flying for a good while essentially you do have to babysit these things. But that is another thing people go wrong with they will just leave the battery sit forever for a month or two and then wonder why it won't charge again. Anyway so like I was saying your battery will be at storage at 25% even 30% is good just don't go lower than 25% and you can keep it sitting for a couple days/week.... I usually don't go more than a week without flying anyways.... and then when I'm ready I just charge the battery up that day that I go to fly. I have three batteries from 9/18 batt1 has 104 charges ....batt2 has 98..... batt 3 has 111 charges. They perform great show no voltage lag when I am in flight and have no swelling even after pushing sometimes in sport mode. Another tip I can give you is always keep an eye on battery voltage while in flight you can click on the battery icon up-top in app, and change the setting to show voltage (comes turned off and most people never notice this setting) and you can watch it as you're flying.... this setting is great because (example: say you are at 75% well now that you have voltage enabled to show next to the battery percent in app, if you start seeing 3.5 or 3.4 volts and you're at 75% battery something is very wrong and you should land.....this kind of gives you a little heads-up and gives you an idea of what's going on with your battery
Turn on "show voltage" in battery setting in app this way u can see what voltage u have at that particular battery percent. Also 25% is fine that is about 3.75v per cell a little lower than I like to do it most of the time I try 30 so I will just land at 30 but 25% will suffice....so no need to charge back up to 40 -50% by the time u get to 50% u are probably at 3.9v per cell.... storage charge is anywhere from 3.75 to 3.80v per cell
There is nothing different that you should be doing, given your frequency of use. Flying 4 batteries daily requires that they be fully charged at all times. You have had at least 150 charges on each, based upon a year and eight batteries. Only half of them have swollen in the heat and humidity. They are consumables. If DJI will replace them, great. If not, it's just the cost of adventure of a couple of hours of daily flying! Most would kill for that opportunity, so replacing 4 batteries a year is a small price too pay! Enjoy!
You don't really have to worry about that the DJI batteries actually limit themselves so they can never be overcharged I use the RC geeks multi charger and I have been using that brand for the og mavic pro and the mavic 2 zoom and pro 2 that I have never had any problems... I think you had a couple issues with the way you were taking care of them you did get some good advice but the most alarming to me was bringing them down to 5% all the time that is just too low.
I completely disagree that taking them down to 5% is a problem. Even at well below 0% the M2 batteries are still above 3.5V per cell, which is nowhere near the 3.0V where problems can occur. His own usage over a year, flying 4 batteries daily to 5%, proves that the batteries are not being harmed! Swelling does not harm the batteries per se. They still perform fine. There is a risk of detachment, however, that makes them unsuitable for flight.
There is such a device and I have been using it for sometime. Storage level from above or below that level, discharge to 0% and charging.
Well, having the batteries be treated like a "pre-parenthood" experiment where you have to nurse, feed and entertain them is crazy. It is like a parent giving a kid a pet on the condition that they handle, care, etc appropriately like another living thing. I also see advice not to charge them when they are too hot. I thought that the batteries (or is it the dji charger) that won't charge if they are too hot anyway.
