Battery help.

[WithTheBirds]

DJI has made these batteries intelligent and will recognize when they are stored for more than 10 days. This is why they will automatically discharge to 65% once that 10 day period is reached. After that there is no real guideline for storing even longer term.

For those interested in maximising long term performance, particularly with respect to usable capacity, we can do a lot better than to rely on the 10 day auto discharge, DJI's 10 day to discharge commencement is a compromise. Left to its own devices with no auto discharge a fully charge LiION chemistry cell will suffer capacity loss and increased IR at a faster rate than one at lower SOC, this is more pronounced at elevated temperatures. It isn't hard to see there are use case scenarios where the 10 day auto discharge could see a battery at or close to 100% for a considerable proportion of its lifespan.

My opinion again but if you're discharging to 25% or so when flying then let the DJI charger and battery intelligence do it's job. Fully charge them back up, put them away and let them go from there.

While you may have a use case where full batteries are required with no available lead time for charging for most people this is poor advice.

In instances when your next use will be within 10 days you have a battery that has been kept qt 100% charge unnecessarily. In instances where the intent of full charge and relying on auto discharge to do its work was to arrive at storage level the best approach is to plug the battery in and allow to charge until it is around 50% before disconnecting.

All you are achieving here is to throw away half a charge cycle that could be applied to flying.

Always though pop them in the charger the night before you're going to fly anyway. And as for some suggestions here regarding third party chargers.. no way! I won't trust them for anything.

What you seemingly dont appreciate is there is nothing fancy about the DJI "chargers". Thery are nothing more than regulated DC power supplies. The charging circuitry is in the battery and includes protection circuity, charging won't commence if the voltage is outside range.

Charging a battery at a higher rate than what the manufacture charger does just to shave off some charging time is dangerous IMO and can risk damage and bursting.

Charge rate is limited by the in battery charging system. You can not exceed the maximum prescribed charge rate no matter how beefed up your power supply might be.

 

[Firejay27]

Charge rate is limited by the in battery charging system. You can not exceed the maximum prescribed charge rate no matter how beefed up your power supply might be.

I'll support my point about third party charges with this product I actually saw recommended by someone here in the threads.

Hanatora Battery Wall Charger & Car Charger for DJI Mavic Air and Remote Controller,5 in 1 Rapid Charging Hub with Charging, Discharging and Storage
https://smile.amazon.com/dp/B07ZV44415/ref=cm_sw_em_r_mt_dp_U_jOYsEb0FGR60V

The above is dangerous as it says in the description that it can discharge a batter to 0%. NEVER NEVER NEVER discharge a lithium battery to 0%. It's very possible it won't recover for one.

EDIT: I stumbled upon this one as well claiming 40% faster charge than OEM. Nope not going to trust.
Smatree Battery Charger Compatible for Mavic Pro/Platinum,Mavic Pro Charge Hub with 80W Rapid Battery Power Adapter(Not fit for DJI Mavic 2 pro/2 Zoom)
https://smile.amazon.com/dp/B071S5XMST/ref=cm_sw_em_r_mt_dp_U_p5YsEbJV22E5G


Ultimately you can't truly trust a third party charger especially if they are cheap Chinese knockoffs which many are. If in fact the DJI batteries are regulated entirely by the battery itself then a charger like this, in order to meet it's claims, is pushing the envelope or doing something to the battery to trick it into accepting a higher rate of charging. IMO if the battery was meant for that higher rate of charging then DJI would have built that into the circuits.

Side note, Best way to provide longevity to any Lithium based battery is to keep in stored in temps around 60 degrees F and in dry locations. I'll put mine in a closet that stays cool along with a drying agent like this Barska Dehumidifier Pack. Goes a lot further than simply bringing your charge down below 100% before storage.

 

[WithTheBirds]

For those interested in maximising long term performance, particularly with respect to usable capacity, we can do a lot better than to rely on the 10 day auto discharge, DJI's 10 day to discharge commencement is a compromise. Left to its own devices with no auto discharge a fully charge LiION chemistry cell will suffer capacity loss and increased IR at a faster rate than one at lower SOC, this is more pronounced at elevated temperatures. It isn't hard to see there are use case scenarios where the 10 day auto discharge could see a battery at or close to 100% for a considerable proportion of its lifespan.


While you may have a use case where full batteries are required with no available lead time for charging for most people this is poor advice.

In instances when your next use will be within 10 days you have a battery that has been kept qt 100% charge unnecessarily. In instances where the intent of full charge and relying on auto discharge to do its work was to arrive at storage level the best approach is to plug the battery in and allow to charge until it is around 50% before disconnecting.

All you are achieving here is to throw away half a charge cycle that could be applied to flying.



What you seemingly dont appreciate is there is nothing fancy about the DJI "chargers". Thery are nothing more than regulated DC power supplies. The charging circuitry is in the battery and includes protection circuity, charging won't commence if the voltage is outside range.



Charge rate is limited by the in battery charging system. You can not exceed the maximum prescribed charge rate no matter how beefed up your power supply might be.

Good recommendation re storage temp. While current LiION tech may have realised improvements in chemistry performance the old rule of thumb for cell ageing with respect to charge level and temp looked like this....



There are clearly benefits to be realised. Capacity loss is for 12 months (unless otherwise stated).

The smatree chargers are recommended by many on this forum and elsewhere. Any regulated DC supply of good quality meeting the voltage and current delivery spec can’t hurt your battery.

As to discharge- the battery will switch off well before reaching critical low cell voltage, it is another inbuilt safety feature.

 

[Heretik]

In this scenario I wouldn't do anything with the battery until you charge it for the next use. 20-30% is a great storage level.

Ive found that recharging the day before flight day assures a 100% availability. These batteries if left fully charged for 7 days will realize somewhere near to 83% on that beautiful sunny flight day.

The Hanatora Battery Charger (HBC) for MA2 and RC is a much quicker (<1/4 time) charger than the DJI charger single port battery charger to recover all your expended batteries plus time to recharge your RController, if not charged simultaneously with the batteries. HBC Charges 4 batteries and the RC in 100 minutes. $50 is in my mind a great value. The Hanatora charger includes a cigarette lighter port adapter; @ $59 from DJI, for another single battery charger.

Batteries discharged to 20-30% and left idle for a week will drain more slowly than one charged to 100% and allowed to lay idle for a week.

Additional note: The USB cable included with your MA2 is by some means a requirement for the MA2. Cant say specifically why but its sez so in the manuel.