Winter has gone and spring is here, so time to get flying again but after the lay up with covid it's time to check the transmitter and receiver batteries. I know the modern NiMH are much better than the old Nicad but they don't last forever.
I think by now we all have multi-function chargers so try and cycle them to check they fully discharge and charge. It's not good finding out they won't discharge when you are in the air.
If you are unsure with this technique have chat with one of your club mates, it's worth the effort.