Battery Not Lighting Up

[RONNOCO1234]

Yesterday I landed my magic pro into a baby pool with about a inch of water but it landed upside down I got it in about 10 seconds of it landing, I brought it in and it was working fine and the battery was fine and dry, I plugged it in to charge overnight like i usually do and when i woke up the lights wouldn't turn on it or wouldn't charge

 

[Cafguy]

DJI batteries are pretty safe BUT I would NEVER charge them unattended and NEVER overnight!!! Even Batteries in good condition can cause a fire while charging Its just good practice to not leave them alone while charging.
Try inserting a battery that was not involved. Will the Drone turn on then? Finally DO NOT place that battery on a charger again. these batteries are NOT waterproof and you could very well have shorted it.

 

[Starz]

Charged overnight unattended?

 

[tstr14]

OP, don't feel bad. Unless you've read about the battery problems specific to drones (though the same problems plague everything else that uses these types of power sources from computers to autos) you obviously didn't realize the danger of charging them unattended. While the risk is probably very low, it nevertheless exists and should not be taken for granted.

On to the problem with the battery: Cafguy offers some good advice on trying another battery to rule out other causes, like the charger being bad. Because I am more curious and perhaps foolhardy, and because batteries are rather expensive, I would take the battery outside and let it set in the sun (I know that can be a problem in Ireland, but I have seen sun there before!) in an attempt to make sure the battery is dried out internally. Then I would try charging it, again while outside. If it happens to charge, you should still consider it suspect and keep it somewhere safe, just in case. Some (self included) use inexpensive military surplus metal ammo cans for this purpose. If the battery fails to charge, after ruling the charger is still functional, properly dispose of the battery and buy another. It's not worth risking a fire!

 

[SpitFire]

I keep my batteries at 1/4 charge in a metal box, and in Li-Po Safe bags when not in use. And, as Gafguy mentioned, never charge batteries unattended. And, the risk is low, it does exist. But it only takes one time, and have very drastic results.
Some Pilots, may say your being overly cautious, but the ball is in your court, its everyone's choice as to what to do. Do you own research, and weigh out the risk.
Forgot to mention, I charge batteries in the metal box, with the lid closed.

 

[MA2 317]

A couple of years old but something to think about.

I doesn't happen, until it does.

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[Conservative Nihilist]

Being reminded of the danger posed by Lipo batteries makes me think about creating a critter-proof box to store all my Lipo batteries in a separate building from where I reside. Even with fire extinguishers handy, I still think these batteries need to be relocated.

Most unnerving of all is those videos that show Lipo batteries spontaneously combusting. Dealing with these highly volatile batteries is the one aspect of drone ownership I don't relish. Hopefully, a more stable and less flammable battery technology than Lipo will materialize in due course.

 

[Felix le Chat]

Concur with all replies. But I'd add the fact that were this mine: I'd dump the battery that went for a paddle - even if it isn't a dead short: it's not trustworthy.

If you're very lucky: your mav pro will still be in working order, put it in a large plastic bag with either dry rice or silica desiccant and stick it in a warm place for at least a couple of days before trying to power it up with a non-waterlogged battery.