"DerbyBorn" wrote in message
2.236...
A neighbour called me to tell me she had put new batteries in her CO2 /
smoke alarm and they were getting hot!
I went to look and as you can guess they had been fitted wrong - but I was
really surprised by the amount of heat they generated. (3 xAA)

I wouldn't be surprised, not after putting the two AA batteries into a Lidl
torch and finding it didn't work.
By the time I got back to the shop (about 5 minutes) it was melting the
plastic bits.
Next time I will remember to take the batteries out.