Care for Mavic 2 Pro batteries, to prevent swelling after 100 plus charges ?

[PatrickMicc]

Care for Mavic 2 Pro batteries, to prevent swelling after 100 plus charges ?
I have gone through 3 batteries and had to replace them because sweeling on the flat bottom. Is there a way to prevent this? Like setting the discharge to 5 days rather then 2 ? THANKS FOR ALL INPUT

 

[waynorth]

There was a swelling problem with a batch of M2P-batteries. DJI has handled it good, they have replaced plenty of batteries for customers with swollen batteries.
The best routine for keeping batteries healthy is to never store them fully charged, not even a few days. Instead of trusting the automatic discharge, fly for a few minutes until the battery has a 50-60% charge.
For long-time storage, charge them fully every 3-4 month, then discharge them to 5-10% with a flight, then charge up to 50-60% after the battery has cooled.
Protect them from high temperatures, like a car in the sun.
Try to avoid high current draw during flight, like flying full speed in sport mode against the wind.

Did DJI replace your 3 swollen batteries, or did you purchase new ones? Newer batteries for the M2P should be better protected against swelling.

 

[slup]

Roughly said...

LiPo's & LiIon's hate...

- to be outside the nominal cell voltage (3,7-3,8v/cell). As a thumb rule, return the battery to nominal charge within 48h.

- excessive heat, don't leave them in the sun, in a hot car or charge them when already hot.

- excessive cold, here the internal resistance is much higher in the chemistry & with amp draw the battery will get much hotter which put wear on it.

- excessive amp draw, this as the battery heats up & the cell voltage drops, maybe to very low levels close to only 3V/cell which puts a tremendous wear on the battery & might damage the cells permanently.

- to get old... they start to deteriorate immediately when they have been manufactured, even if you don't use them.

- to get used... every time they gets charged & discharged they get closer to it's end of life.


Both gassing, increased internal resistance & a diminishing total battery capacity is normal signs of wear for a Lithium battery... how alarming or how quick this will be is on you & how you use & treat the battery. Avoid the "hate" factors that can be avoided... & put on the bulk of use onto the batteries while they still are young.

And remember that battery heat up & internal battery resistance are closely tied together...

- With a low internal resistance the battery can deliver amps without a heat build up & without deeper cell voltage sag.
- With an increased internal battery temperature the internal resistance increases un-reversible, which deepens the voltage sag & make it harder for the battery to deliver amps instead of... more heat.

 

[PatrickMicc]

There was a swelling problem with a batch of M2P-batteries. DJI has handled it good, they have replaced plenty of batteries for customers with swollen batteries.
The best routine for keeping batteries healthy is to never store them fully charged, not even a few days. Instead of trusting the automatic discharge, fly for a few minutes until the battery has a 50-60% charge.
For long-time storage, charge them fully every 3-4 month, then discharge them to 5-10% with a flight, then charge up to 50-60% after the battery has cooled.
Protect them from high temperatures, like a car in the sun.
Try to avoid high current draw during flight, like flying full speed in sport mode against the wind.

Did DJI replace your 3 swollen batteries, or did you purchase new ones? Newer batteries for the M2P should be better protected against swelling.

I did not even ask them about it, because they had like 150 charges on them.

 

[PatrickMicc]

Roughly said...

LiPo's & LiIon's hate...

- to be outside the nominal cell voltage (3,7-3,8v/cell). As a thumb rule, return the battery to nominal charge within 48h.

- excessive heat, don't leave them in the sun, in a hot car or charge them when already hot.

- excessive cold, here the internal resistance is much higher in the chemistry & with amp draw the battery will get much hotter which put wear on it.

- excessive amp draw, this as the battery heats up & the cell voltage drops, maybe to very low levels close to only 3V/cell which puts a tremendous wear on the battery & might damage the cells permanently.

- to get old... they start to deteriorate immediately when they have been manufactured, even if you don't use them.

- to get used... every time they gets charged & discharged they get closer to it's end of life.


Both gassing, increased internal resistance & a diminishing total battery capacity is normal signs of wear for a Lithium battery... how alarming or how quick this will be is on you & how you use & treat the battery. Avoid the "hate" factors that can be avoided... & put on the bulk of use onto the batteries while they still are young.

And remember that battery heat up & internal battery resistance are closely tied together...

- With a low internal resistance the battery can deliver amps without a heat build up & without deeper cell voltage sag.
- With an increased internal battery temperature the internal resistance increases un-reversible, which deepens the voltage sag & make it harder for the battery to deliver amps instead of... more heat.

Thanks for the information, i appreciate it