I have two of the Ryobi 4AH batteries. I charged them in December, but
not again since - until yesterday.
I had 256 3/8" holes to drill in oak. I would normally use a corded
drill for something like that, but I was curious about the batteries, so
I used a cordless.
After perhaps a hundred holes the drill stopped working, all at once. In
other words, I noticed no obvious slowing down of the drill; it worked
at (or near) full power, then stopped. I looked at the "meter" on the
battery (you press a button to see it) and it showed 1 LED (out of 4 or
5). I switched to the other battery, which did most of the rest of the
job before stopping in the same fashion. I switched back to the first
battery, which was now charged and it worked fine.
While it's possible that the batteries stopped because of a thermal
cutoff (I hear the LI batteries have that feature), I think this was
simply a low-charge cutoff. Interesting.
I'm pretty pleased that these batteries, charged six months ago and used
a number of times in the interim, drilled 100+ holes apiece before
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