New but 1 year stored LiIon Packs

[3DJunk]

Hi I purchased 5 LiIon packs about a year ago, last September if not mistaken. 2 of the packs were peerless 2400mAh and the rest were normal LiIons, I have not used the batteries they are still in the box the dealer sent.

Can I use them or their performance might have been degraded after one year stored? What can I do to check that they are ok? I have also the 8 ball meter bat checker so I could do some tests with that if required.

Thanks,
NK

[Fromeco]

Do a load check. Hook them up to a charger, and charge them up. Then, do a discharge test at 500mAh, Discharge the battery down to 6.0 Volts. This is the only time it is Okay to take them this low. Do not discharge the pack at more than 500mAh, if you going to 6.0 Volts. This will tell you if you have full capacity. If you stored them in a cool place, most likely they will be just fine. If they have been sitting in your back window, in Death Valley, all summer long, they are probably not. Kurt Cook

[3DJunk]

Hi there,

Thanks for your last answer. I just would like to provide you with an update on these batteries and please comment if possible.

I use three LiIon 2s Peerless 2400mAh packs on my plane, two on Rx and one on ignition. The batteries are a bit less than two years old. They work fine and they seem to have similar consumption per flight, I test them using the Fromeco load tester. I charge them using a Schultze Chameleon charger on 2s LiIon program and 300mAh charge current. Under these program all the LiIon packs I had till now including other makers, charge up to 8.22V which is ok, I don't want to stress them up to 8.4V using the LiPo program.

The other day I noticed that one Rx pack reached 8.22V, the other Rx pack 8.20V and the ignitionpack 8.17V. I was a bit curious so what I did was to discharge the ignition one (8.17V) and check what it will give me. I discharged them up to 6V and provided 2100mAh. I believe that that the 8.20V will give a bit more Amps. Should I continue using these batteries or not really?

Please provide your comments,

Thanks Nikos