BT 1250 Classic User Manual page 7

If you need to replace the handset battery,
slide off the battery cover. Remove the old
battery by disconnecting the small plug
inside the battery compartment.
Connect the plug of the new battery.
Replace the battery cover.
Please pay attention not to damage the
charging contacts on the handset.
Plug the line cord into the telephone wall socket.
There are 3 removeable handset fascias to
choose from. Simply slide the fascias off and
replace with another.
7