I have a Craftsman 14.4v (12x1.2v=14.4v)
I usually run one until it drops to about 12v,
which is really sluggish on a speed bore 1/2 soft
wood drill....then switch to a fresh batt.pak
that I have charged to about 16.2 (about 1.35 per
cell)or in your case with 11 cells, 14.85v...
I have a 'smart charger' that would recharge these
batt.paks in about an hour but the paks I now have
look like the smart charger batt.paks but they
have a different number...in other words they
are made for the slow charger.
I seldom need both batteries full charged.
(16v.)
Works for me....I try to use the drill at least
once a week...both paks.driving 2 or 3 ...3 inch
deck screws into some scrap wood....
The cells in mine are 'c size 1300Ma/Hr ' ,
yours are probably the same.
If you would have had a 'smart charger' that
batt.pak would have had a third wire going to
one of the cells....a probe to monitor 'something' ??
to enable the charger to
fast charge safely...
If you want to take advantage of Bruce's offer,
...It's a real bargain...as you'll quickly find
out if you do some Googling.
...and I think you have to have the batteries
connected to your charger to see if it's working.