I have 2 of what you have, don't be so hasty to
replace those batterys now if you have the smart
charger and your battery is low 2 lights may go
on indicating it is on slow charge ....you can
fool it by quickly plugging it in.... barely
unplugging it....then quickly plugging it back in
it may take a few tries before you get the knack
....but it does work.
In my case on one of them that I had, the pak
had built up crystals blocking the flow of
current,took the battery pak apart and took my
10 amp 12volt battery charger and zapped each
cell about 3 times.
There are two types of 14.4 Craftsman paks....
they have different numbers one is for the
smart charger fast charge and the other is for the
slow charger if you try to charge the slow charge
battery with the smart charger ...the green light
will come on but it will slow charge.....
On the other hand if you try to charge a fast
charge battery with the slow charge it will burn
up ....at least mine did....