it's the battery 100% and I just switched out the hump with another and it too is buzzing. They are both the same

1600
5 cell
6.0 Volt
hump pack

one of them is old (6-8mo.) the other is about a month old

I'm using the IntelliPeak charger and eak charging at 1.0 Amp
I'm I doing damage to the charger?