I have bought three brand new batterys for my 125 yamaha teos all the batterys have drained after about an hour and no electrics work

Maybe you need a new battery.

must have a short, is it fitted with an alarm? also make sure it is charging the battery in the first place and isn't just draining it as you ride.

under the seat, normally to be accessed from the side. nore where the plastic panels are on the left and right hand side ? the battery is behind one of those. Sometimes you may need to remove of flip the seat up to access it properly.

This is normal and only shows the battery voltage and then swings over to show your fuel tank level so nothing to worry about.This will happen on every turn of the ignition and when switching off it reverts to the battery voltage position so if you cam eover to your bike in the morning for example(with a good battery the day before) the needle would have gone lower before switching to the petrol level indicating a weak battery so it;s only a condition check, as with cars whoi have airbags etc that show all lights then switch them off if all is okay.These are lovely powerfull mopeds and if you look after it and service it it will last many miles trouble free.

CB4LB - BATTERY -
POWERITE:
Powerite Batteries

RC = ReCharge, either the battery is bad, or drain, but both can be caused by a continuous short circuit on the bike's coil and the body / battery.

First: Charge the battery at least overnight. Second: Look for mice damage to the wiring.