Ryobi 18v battery drill/driver on/off switch faulty stuck on go

check that the battery terminals are standing up enough to make good contact in the units

easy to fix
with the drill not running

grab the bottom part of the spinning part of the drill nearest the drill's motor.
then
grab the spinning shaft bit nearest the drill bit
pull them apart slightly

when the two parts are pushed together thay lock the chuck

I own a ryobi hammer drill that does the same thing

If you can to take apart the drills, put the battery directly to the motor. If it is turning the , probably the switch is faulty. If it is a controlable speed drill, check the FET transistor. I recently replaced the FET in a Ryobi drill. Cost $5 and workin glik ebrand new.

I just went through this with Porter Cable 18V but I can't say it is the same for Ryobi. On the PC, all 18V batteries are interchangable on the tools, but the charging needs are different. A dedicated NiCad charger can't shouldn't be used for liOn but the later chargers will work for either battery.
Ryobi offers an 18V upgrade:
RYOBI Tools

would have paid you good money for that set.

Try holding the bit in a vice and gently tap the chuck off of the bit and see it it releases the pressure on the jaws.

That is true the One+ 18V Li-Ion battery packs will work in any One+ 18V Ryobi tool. However the Lithium ion batteries will not charge in the original P110 NiCd charger. You will need one of the the new series Ryobi One+ 18V "dual chemistry" chargers for that. The will charge both types of battery packs.

You are the thrid person in the last couple of days with this same problem and i check who was posting the problems all differant people all RYOBI 18V lithium-ion batterys and they all got them for christmas. SOMETHING is not right there is now warranty on the batterys but there is one on faulty workmenship there must be a problem with this type of battery good luck

NO! Never charge lithium batteries in a charger designed for nickle based batteries like the NiHi your old charger was meant for. Ryobi did design the new Lithium charger to be backwards compatible so you can charge your older 18V NiHi batteries in the Lithium 18V charger.
Also note, NEVER miss-match the voltage, for example, make sure you are not trying to charge 12V batteries in an 18V charger unless the manufacturer has specifically stated that the charger is capable of multiple voltages.

No, just return it, for the money they should give you one that works. It is common to get a defective Ryobi 18v lithium battery. I've had 2 out of 7 purchased that wouldn't hold a charge. But when you get a good one they work awesome!