UPDATE-Swollen Battery – What causes it - How to PreventI went out and flew today and when I landed, took the battery out I noticed that the battery was swelling. Is this normal after a flight or should I be looking for another battery ?
To be clear, the DJI 25% shipping charge is also in a hibernation condition programmed in at the factory. Once initially charged, the 40%-60% storage would be the minimum, as I know of no way to recreate the factory induced hibernation state.Keeping a battery at 80% for storage is way too high. Standard recommendations are between 40-60%.
DJI batteries are shipped at 25%
Charging process is constant current until max voltage is reached. That's around 80%. Then charge function changes to constant voltage, and stops when current drops to a certain level.
Assuming that all to be true, my main point is that the 25% hibernation charge is somehow fixed, so it cannot degrade below that, while in factory induced hibernation mode, which cannot be recreated outside of the factory, so one should not use 25% as a user storage charge, as it will soon deteriorate unsafely below that level. That's why the 40-60% is ideal, and leaves plenty of room for additional loss during storage. A monthly charge for maintenance would still be a good idea during prolonged storage.The hibernation state would be with the electronics, not the cells to prevent the electronics from being able to drain the cells any further.
Consider that the cells could be at 25% for a few months before it reaches the end-user, which tells me that barring some discharge through the electronics even further (and that would take many months), DJI doesn't consider 25% a problem as a storage charge level.
Yes, that is what I was trying to say, but you said it better!The DJI new battery storage of 25% has nothing to do with recomended storage level but is actually a factory setting to comply with worldwide shipping that DJI has Airlines and shipping companies. It is a safty certification to alow shipping battery with Drone in in normal airline cargo. DJI have been certified for this.
The key is that the battery is at 25% in a hibernation state, where it doesn't lose charge on a daily basis, unlike a battery out of hibernation.I agree higher would be better to give leeway for any self-discharge, but considering that the batteries from the factory can be at 25% for months tells me that this level alone can't cause harm or it wouldn't be shipped this way.
Of course that is DJI % which I think was 3.6v.
My laptop on the other hand was at 60% on the laptop scale.