That did not work. I tried it twice.
After that, I tried a fully charged battery from another phone. That didn't work either.
The charger on the old phone is a Thomson Inc. Model # XXXXX 7.5vdc 150mA
The chargers on the new phones are Thomson Inc. Model #5-2716 9vdc 150mA
I have spoken with the manufacturer, Thomson Inc. They told me the phones are not repairable from here and recommended I return them to the store.