Later Battery Technology

For years the battery technology has been first Nickel Cadmium, NiCad batteries from 60+ years back. Then Nickel Metal Hydride, NiMH, which today is common in these inexpensive GMRS radios. Maximum capacity of these rechargeable battery systems is 600 mAh to 700 mAh. At most about 10 hours with little transmitting.

Lithium Ion core NIMH and rechargeable alkaline AA size batteries are  available in capacities of 2500 mAh to upgrade some GMRS radios. This provides a big improvement on the order of 3X to 4X operational time.

The Motorola radios, similar to the NMR350R below require little folded 11/4  inch aluminum foil strips under base of the two outside batteries folded slightly to make contact with the battery door metal charging tabs. The 3mm or wider copper desoldering braid also works for this purpose. Tape under makes sure no short to battery shell.