The 12 volt drill is about three years old. the drill will stop when under a heavier load with either battery. Is the problem with the batteries or the drill? [email protected]

Test the battery for load not volts. Use a load tester. If it falls below 9volts under load replace battery. If the battery is older than 3 years old replace it. A bad battery will damage the alternator (full field condition).

I will interpret this as "can I get replacement batteries for my 12V cordless shop source drill?" probably not. Most manufacturers phased out 12 volt tools years ago, replacing them with 18 or 20 volt tools , though a few people still sell dewalt 12 volt batteries.

Seems battery go out make it sure bettety outp volt it must be 11-12 v if not then battery need to replace

Lithium batteries do have a life span determined by how many times the battery is discharged and recharged and how hard it is worked on the tool. Batteries get hot while charging and discharging and heat is what ages batteries. Lithium batteries, depending on usage, will last from one to three years. I've seen some last five years but that's rare. They also have numerous cells and a circuit board that can go bad and kill the battery. Chargers are designed to check the battery's condition and won't charge a battery if it detects something wrong. If your battery is under one year old, it's covered by the warranty. If it's over, you'll have to buy a new battery.

Either bad batteries or a bad charger. You can use a multimeter to test for DC voltage output in the charger.

This close to father's day you should be able to buy a new drill for about the same as a battery. The 12v would overheat the motor if you ran it for an extended period.

If light is on charger the charge is fine. You could verify using voltmeter it should put out = to what it says on the back of charger 12-18 volts or so.
Most likely battery is shot after 8 years they just dont' hold a charge anymore and they often will only charge for a few minutes when the chip in the computer tells the charger to shut off due to defective battery.
compare prices of new drills and new batterys sometimes new drill is not much more. Try ebay and harbor freight for ultra low priced batteries.

I have a 5 year old EU300is that would not start with or without the battery. I went through all the usual such as gas, plug, oil, etc. The battery showed 12 volts, however, when tested further it would not hold a load. I bought a new American made battery and now the unit runs fine.

only if the amps are the same and the polarity and size of the plug fit.

have you tried the batterys in any other tool?

you would also need to check the voltage of the batterys they should be at least 18 volts (19 prefered)

then if the batterys do not show charged you would need to make sure the battery charger is putting out voltage.

After that contact your closest Ryobi service center we would check that for free to let you know what you need, I am sure you local place would do the same.