Hi All, I charged my
mavic 2 batteries for the first time with the car charger on the weekend and I have read the batteries have a temperature cut off inbuilt.
Having charged phantom batteries in a car boot before from an inverter and having the batteries swell (was a hot day), I’m keen not to repeat that mistake again and I was wondering what is the temperature which the batteries cutoff charging, and does it always work etc?
This is a great time to discuss this, since summer temperatures have already arrived for some members.
The OP stored his previous Phantom battery in the trunk "boot" of his car when the temp was hotter than specs, and although the internal battery thermometer could have cut off the charge to prevent puffing, the battery puffed due to the ambient temperature.
Before charging, the batteries thermometer checks its temperature, and if it in excess of the manufacturers specs, the batteries circuitry will not allow it to charge. This happens frequently after a flight, when the batteries temperature has risen to above what its preprogrammed spec temps are for safe battery charging, and the circuitry will not allow the battery to charge until it has cooled below that threshold.
Theres a problem that DJI has not solved yet. What if a battery is overheating during flight, and the battery is on the verge of causing permanent damage to itself and the drone? The drone will turn off or land, right? Unfortunately not. Its supposed to, but doesnt always detect and protect the drone from excess temperatures until its too late.
So what can you do to prevent the battery from overheating during charging, and overheating during flight? Simple. First, use the OPs experience as a lesson, and dont leave you Mavic batteries in the car in warmer weather. They say not to leave your baby or dog in the car during warm weather, well, the same applies to your battery.
Second, try not to fly when the ambient temperature is above 100°. Thats already almost terminal temperature for the battery before its even been turned on. Even if it lets you turn it on, you will soon be near max temp within a short time after you start flying.
So, keeping your batteries at storage level and keeping them out of extreme temperatures is the safe thing to do, and will help your batteries live long healthy lives.