|Battery Secondary No. 22 is a red plastic cased battery pack that was used
in some 700 type push button telephones. Most of these batteries are now dead or
failing and the instructions below advise on how to replace the
The original battery comprises of two cells marked NCB 1572A - Made in
Remove the battery lid
Remove the old batteries - your have to prise these out - and then remove the lead.
Obtain cells that match the voltage and current criteria and that will fit into the case. Try to use NiMH batteries. Ensure that the leads are connected correctly.
Last revised: February 27, 2019