I have two 3s 5000mah battery packs and both are showing the same unusual behaviour.
The 2 packs are about 2 years old and have been used about 60 to 70 times each. They have never been run down to low, theres usually about 30% to 40% in them after the flight.
I have always charged them at 4.0A and they record about 97% to 99% capacity and the cells are always balanced.
Recently when I have charged them at 4.0A my charger beeps with an "Input voltage error" warning. Its only on these 2 packs it gives this warning.
I find I can now only charge these packs at 1.0A...any higher and I get the warning message. The resulting charge gives 97% to 99% charge and the cells are balanced and they packs perform as normal in the planes. The packs do not get warm during the charge.
Basically there is no differance to how they use to be, just the low charge rate.
Whilst this is not a problem as it just simply takes longer to charge, I was wondering if a more serious problem exists.
Any advice/thoughts appreciated.