Hi,
As I have now received my Mini 3 Pro and will probably not be flying the Mavic 2 Pro so much anymore.
In order to keep  the batteries in good condition, is there a god battery discharger for this?
I still have the original DJI Charger and would like to avoid putting the battery in the drone and keep
it running inside until the battery voltages are down to 3,8V per cell or about 50% down.

Is there a good battery discharger that can be set to a specific voltage or % to shut down automatically,
just in case I am not keeping an eye on them all the time.

Appreciate any help. Thanks.

Hi, kyalami. Thank you for reaching out. You may set the time to discharge for the Mavic 2 battery. PLease check the details below:
• For the FW before V01.00.0510, the Mavic 2 battery would be automatically discharged after 10 days without any operation if the battery capacity is larger than 70%. There would be 3-4 days from full charge to 60% remaining.
• For the FW is and after V01.00.0510, it optimized the auto discharging function for the Intelligent Flight Battery, by which the time to discharge could be set in DJI GO 4 app (with DJI GO 4 V4.3.24 or later version). The default setting is five days, and the time could be set from 1-10 days.
• For the FW isV01.00.0670， updated auto discharge default settings to two days

If you still refer 3rd party accessories, hopefully, other users can provide you suggestion about that one. Thank you for your continued support.

DJI Gamora Posted at 9-17 07:37
Hi, kyalami. Thank you for reaching out. You may set the time to discharge for the Mavic 2 battery. PLease check the details below:
• For the FW before V01.00.0510, the Mavic 2 battery would be automatically discharged after 10 days without any operation if the battery capacity is larger than 70%. There would be 3-4 days from full charge to 60% remaining.
• For the FW is and after V01.00.0510, it optimized the auto discharging function for the Intelligent Flight Battery, by which the time to discharge could be set in DJI GO 4 app (with DJI GO 4 V4.3.24 or later version). The default setting is five days, and the time could be set from 1-10 days.

Thanks Gamora,

Yes mine are set to discharge in 2 days, so not to be fully loaded for too long.

My FW for the GO 4 is 4.3.46 as on 22 December 2022 and the remote controller is 01.00.0700. so it has the minimum setting of 2 day as a default. So perhaps the storage setting of 70% is OK for say about 3 month before recharging it again.

Dirty Bird Posted at 9-17 16:59
The Mavic 2 batteries will discharge themselves automatically.  You do not need a dedicated discharger.  Just remember to fully charge all of the batteries, along with the RC, once every 30-60 days.

Hi Dirty Bird,

Appreciate your reply, but I would like to get the batteries down more that 70%.

I would prefer to get them down to about 20-25%, like when I fly and then charge them fully up again and discharge them down to at about 50% or at  3,8 Volts per cell. This way they get exercised like you are flying.

This was something I read about a few years back by someone that worked making these batteries as well as many who RC enthusiasts.

However, have I got this info wrong, I am certainly interested to listen.

Cheers

I have a Hanatora charger/discharger for my Mavic 2 batteries.
If I don't use the batteries I run a cycle every 3-4 months. That means I first charge them fully, then discharge them to low voltage. Then I set the charger to charge up to 60%, then it stops charging automatically. This is the recommended long-time storage voltage.

If not flying them to 50%, I use an adaptor and connect my chrged M2P batteries to chrge my  mobile phones, tablets, etc etc.

Dirty Bird Posted at 9-18 02:07
The batteries will discharge themselves down to about 65%.  The remaining charge will dissipate over time, hence the importance of recharging them every 30-60 days.  Li-Pos do not like being too full or empty.  Everything I have ever read about them says to store them at 50-65% charge.  I am not sure what is to be gained by "exercising" them as batteries have a finite number of cycles?  65% must work as, for all my DJI batteries save the Mavic 2 which is prone to swelling, my batteries are holding up quite well.  Even my ancient Phantom 2 batteries still work.

" I am not sure what is to be gained by "exercising" them as batteries have a finite number of cycles? "

It is recommended by DJI that you do a cycle every now and then if the batteries are stored for a long time (several months).

Dirty Bird Posted at 9-18 02:07
The batteries will discharge themselves down to about 65%.  The remaining charge will dissipate over time, hence the importance of recharging them every 30-60 days.  Li-Pos do not like being too full or empty.  Everything I have ever read about them says to store them at 50-65% charge.  I am not sure what is to be gained by "exercising" them as batteries have a finite number of cycles?  65% must work as, for all my DJI batteries save the Mavic 2 which are prone to swelling, my batteries are holding up quite well.  Even my ancient Phantom 2 batteries still work.

Hi,

I am aware of that the batteries will slowly go down by themselves, but not sure how much and for how long time. This is something that I would check every now and again, but have so far not seen any degradation over 2 months or levels going down.

Yes 50% is about right, as it is about 3,8v per cell, which from a manufacturer of Lipo batteries.

I never keep the batteries fully charged or empty at all, as I know this is not good for them. Always charge them the day I will fly.

I will not fly Mavic 2 Pro winter time, as I now have the Mini 2 Pro and can fly almost where I want. So I just want to keep M2P batteries at the best value and exercise them a few times over winter which would probably be about 3-4 times and that would be about every 2 months. These few times will not degrade them. Then when it gets warmer again I will start using the Mavic 2 Pro.

When I fly the Mavic 2 Pro, my settings is to warn me at 25% and can then land fairly fast and have minimum at 22 to 23 % at landing time. This is the value I would like to go down to and then charge them up full again and discharge them to 3,8V. So the exercise is then the same as when flying.

This is what I have read, that it is good to exercise them if not used for a longer time. Otherwise for sure they will go eventually  go down.

ArcticPhoto Posted at 9-18 00:46
I have a Hanatora charger/discharger for my Mavic 2 batteries.
If I don't use the batteries I run a cycle every 3-4 months. That means I first charge them fully, then discharge them to low voltage. Then I set the charger to charge up to 60%, then it stops charging automatically. This is the recommended long-time storage voltage.

Hi,

This is exactly what I would like to do. Yes definitely charge them up to 3,8V after discharge them to a low voltage. Like 20-25%, as when I am flying and then store them.

That's good to know that you can do the cycle 3-4 months. This means even less cycles over my winter. I guess that you have the same length of winter as we have here in Sweden.

deleted, wrong post

kyalami Posted at 9-18 05:26
Hi,

This is exactly what I would like to do. Yes definitely charge them up to 3,8V after discharge them to a low voltage. Like 20-25%, as when I am flying and then store them.

Storing the batteries at 20-25% charge is too low. DJI says always store them at 50-60% charge.

ArcticPhoto Posted at 9-18 06:51
Storing the batteries at 20-25% charge is too low. DJI says always store them at 50-60% charge.

Sorry, my mistake.

I would not store them that low. I would discharge then to that value and then bring them up to about 50% or 3,8 volts for storage..

To exercise them I charge them up first to full voltage and then discage them to about 25% like when I fly them and the charge them up 50%. This is the complete exercise of the battery..