Q500 batteries dead after sitting for 2 months

[KnoxHarrington]

Hello everybody. I picked up a Q 500 drone a couple months back with a venom Q500 power station charger and two batteries. One of the batteries is a 5400 MAH Yuneec power 3 and the other is a power extra 6300 MAH Lipo. I tested the charger and fully charged the batteries, everything looked fine. But then like a fool I let them set for the past 60 days, and when I tested them again yesterday they wouldn’t charge. I let them sit on the charger for about 15 minutes but nothing happened. I watched a video where a guy talked about reviving his Lipo battery with a Nimh trickle charger, but I don’t have one and don’t know what I’m doing. Is there anybody I can take these to? Should I leave them on the charger longer? Any advice would be greatly appreciated.

 

[BobW55]

NEVER leave a Lipo battery ON a charger.
1) Are the batteries totally dead?
2) Can you measure the battery voltage and post it?
3) Does the charger just not charge, or is it saying the batteries are full?

 

[KnoxHarrington]

Maybe I wasn’t clear, the batteries and charger were packed away in a storage bin, they weren’t actually plugged in on the charger the whole time. I don’t know if the batteries are totally dead, all I know is that the charger doesn’t display a charge level when I plugged them in for 15m or so. Sorry, I don’t have a voltmeter to measure the battery voltage. Thanks a lot for your reply.

 

[Steve Carr]

Get one of these so you can check your battery voltage level. It works with the Q500 and the H. You need to be able to check voltages.
Yuneec Q500 & Typhoon H Dual Voltage Batteries Tester by ULTIMAXX - Brand New! | eBay

Or get on of these so you can also check the level of each cell in the battery.
Apex RC Products 2-6 Cell Lipo Battery Voltage Checker Tester - 2 Pack #1650 | eBay
Quadcopter RC 1-8S Lipo/Li-ion/Fe Battery Voltage 2IN1 Tester Low Voltage Alarm | eBay