I managed to fry one of the batteries to my DeWalt 18v drill , and I'm a
bit confused ... My batteries are model DC9098 . I find all kinds of
replacement batteries , and one of the most common is a DW , not a DC 9098 .
I see a difference in the A/Hour ratings , and wonder if this is the
difference in the letter designation . I'd match the battery to the model of
the drill , but the tag with the number is damaged . I've been a fan of the
Dewalt drills for over 20 years , and until now the only battery failures
I've seen were due to not completely draining them to dead before charging .
I had a 12v battery last over 6 years ... but this 18v unit died the other
day while I was using my drill to mix mortar for the stone work behind my WB
stove ... got hot , then nothing and now it won't charge . And I gotta have
a 2nd battery , one to use while the other charges .
Not NiCad's , they'll never take a full charge again if you don't
discharge them fully before charging . I and a coworker both got identical
new drills at the same time . He would slap a fresh battery in as soon as
his slowed a little , I'd run mine all the way down . My batteries lasted an
average of 4+ years , his were being replaced on average in less than a year
Different strokes. I do it like your buddy does and I have several
packs that are nearly 12 years old and work fine. If you take them down
much below 1.1V/cell you are not doing them any favors. Your drill may
refuse to run before you get there. Thus your good fortune so far.
The problem with "all the way down", is that after a cell gets to zero
volts, continued current flow will reverse charge it. Your 4+ years
batteries probably had well matched cells that all discharged at the
When I have trouble with my 18V batteries, I take them to "Batteries
Plus". They refill them with the higher A/Hour cells. The refills are
less expensive than DeWalt, and seem to last longer.
Yup, I did that last time Lowe's had them on sale for $99. However, you
get the smaller batteries. That's ok for me because they are certainly
lighter in weight. With the way I use them, I've not noticed a problem.
And the big plus for me is that I think my old charger was over
charging (in a trickle mode after the light goes out) because the
battery always remained warm while on the charger. The new charger with
the drill kit, doesn't do that.
>>Lithium batteries are smaller/lighten, charge more efficiently...last
>>at least at long. Possibly what you have?
Definitely not. DeWalt does have a smaller NiCd battery with a little
less capacity, lighter in weight and slightly smaller in size. I wish
they did have a LIon replacement for the 18 volt DeWalt batteries. It
might be nice.
If I needed a cordless now, I would look in to that just because of the free
batteries for life. I have an 18 volt Dewalt and the batteries seem to be
in good shape. I don't use it very often,so they may go bad because they
are not used much. I do charge them a couple of times a year.
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