How to change batteries in motorola MG 160A wallow talkies

SOURCE: Unit won't turn on. Battery indifferent.

I bought these phones at a yard sale for $2.00, One phone powered up, the other did not. Of course the first thing you think is battery; right? Interestingly swapping the battery with the working ohone made no difference, the unit still would not turn on. After a close inspection, I noticed variation in the way and the shape in which the battery contactors were bent to make contact. I used a snall knife point and re-shaped the contacts into more of a vee shape, just like the ones on the working unit, I replaced the battery and the unit still did not turn on. I tried swapping batteries again and whala; the unit powered up and worked perfectly,

SOURCE: Talkabout T4500 (7 Channels) 2-Way Radio: A Motorola T4500 (small) walkie talkie makes a sta...

One of my T4500 radios does the same thing. When I transmit or the radio is receiving, the interval is interrupted and it takes another 12 seconds to make a popping noise. Weird! I tried to post this as a comment but FixYa kicks out an error so apologies for posting it as a solution!