I take it they where empty in May? Otherwise they should still be full. A couple of months ago I found our old heli and its batteri had been fully charged and tucked away with the chopper some two years ago. It was still about 85 % charged.
Use a LiPo-sack, and charge at 1 C (while you stay in the room). As you say, any loss has already occured so you only risk loosing a couple of minutes more if they do not take charge.
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The Tamiya Sheep
Various Tamiyas including TRF201 and TRF511
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