questionscan i use a 19.2 volt battery in my 18 volt…

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Wouldn't recommend it. The extra power would be too much for the motor and most likely ruin it over time.

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Does the battery fit in the drill? If it does I can't see how you would do too much damage putting the battery and squeezing the trigger real quick. I doubt it will fit though.

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I'd say take it to Sears and explain the situation. Then I realized you would need to deal with Sears... You're probably better off selling the battery on eBay or CraigsList and buying what you really need.

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Personally, I would use it. You are talking about only a 7% increase in voltage. I wouldn't expect this to reduce the life of the drill very much - and you would likely have to replace the battery within a year or two anyways because of the tendency for batteries to loose their ability to hold a charge.

I'm sure the manufacturer of the drill would tell you to purchase the 18v battery simply because it would give them profit and not hold them liable if any damage did occur.

Quote from a web search - "I "fit" 14.4's on my 12v, I've been doing it for the past 10 years, never had a problem. "

If you are really worried about messing up your drill, I would do like @ganzhimself suggested and either try to explain the situation at Sears or sell it through a website.

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Also, using a 19.2v battery in an 18v charger should work, but it would take about 30% longer to charge assuming their mAh ratings are the same

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I see most of the right answers already listed.

1. Does the battery fit your charger and drill?

2. If so, you can use it without any real issue. Your drill is a DC motor. As it spins, it generates a "counter EMF". Using a slightly higher voltage means that at full speed it will rotate a bit faster than with the 18.0 Vdc battery, but no other detrimental effect.

3. Charging may be a problem. You don't say whether the battery is Lithium-ion or NiCad. The 18.0V charger will undercharge a 19.2V battery which will result in less useful life. There is also an issue of the charging curve. NiCad and Li-ion require a specific charging pattern or they can overheat, or end up with reduced life. Unit chargers actually have a special chip that senses the type battery and alters the charge rate to the appropriate profile. Mismatched battery and charger will end up giving you less than optimal results.

* -- As mentioned above, see if you can exchange the battery for the correct one.*

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Thanks everyone! Yes, the battery does fit my drill, though it seems it doesn't lock completely into place due to some red clips that my other batteries did not have. The drill works with the 19.2, but I was worried about possible damage, hence the question.

I like the online selling suggestion, but I will at least give Sears locally a chance before pulling the plug on them. One chance.

Good stuff, thanks for all your help!