Left two 3S lipos charged for about a year..

[Mike_Somebody]

Should I simply dispose of them or are they still usable? Neither smell sweet nor look puffy...and I'd rather not toss away expensive batteries if I can still safely use them.

 

[Doom!]

I would see if they take a charge.

 

[tntpoof]

try to charge look at ir . don't leave charged for the next 365.. all depends on whom made them might get lucky. Charge outdoors if possible

 

[Dan B.]

What about running a storage/balance charge on them, then a balance charge after, keeping watch of the independent cell voltages? Maybe a few cycles of that can bring them back. Definitely worth a shot.

 

[olds97_lss]

I'd just cycle them and see how they do. I know some people do whatever they want to their lipo's... they don't last as long or perform as well as those that always store them at storage and charge them at 1C, but they still work.

 

[Addict Rc]

That’s a long time 1 year was it plugged in or unplugged the charger?
Get a lipo voltage detector and see if they are any good with how many volts they have