The 7AH batteries are 6" by 4" by 2.5" and weigh quite a bit. I use them on
a cord because they are just a little too heavy to mount at the end of the
drill. The 3AH batteries come in a lot smaller at 2.5 by 2.5 by 5.5" and a
lot lighter and are no heavier than the NiCads that came with the unit.
Answering Steve's question here, I charge them with a two-stage 1A float
charger I got that is designed specifically for gel cells (different rates
for basic charging and float charging). It cost me $10 at Allelectronics.
I'll bet Harbor Freight has one cheaper.
The float charger is used to to keep the battery topped off. I have a 33AH
wheelchair battery that my battery powered sump runs from and I keep the
float charger attached to that most of the time. Occasionally it's pressed
into service to charge the drill battery. The float chargers put out just a
trickle once the battery reaches its full charge. I'll post the model
number of the charger when I get a moment.
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