Charging walkie talkies

I have Model GA-CC Cobra Walkie Talkies (2) and a base charger. The back of the walkie talkies appear to have a battery compartment with a push button, however, I can't seem to open it to replace the batteries. The hard plastic belt "loops" are in the way. They are no longer effectively charging in the base. Can you help?

Dear sir,
Pls test the Voltage output from adoptor with the help of a multimetre , if voltage is OK i mean 6~7 volt opne the base & see for any wire cut , or dry soldering.

Hello, I am trying to recall this model's structure,------- Have you the user's booklet that came with it?Get a magnifiering glass and carefully and patiently look round the battery area,use the edge of a thin blade knife to probe that area for any movement. However before this are you sure that the charger is working? and/or putting out the requried voltage, this voltage should be on the charger some where. A meter of some kind would be required for this purpose, (perhaps a friend would have one) also go to Google and ask for a copyof a booklet on that model, they can scan it and email it to you,
hope you have success,

This is more for "mshtexas" than the OP but I'm sure there may be others out there wondering the same thing. The power cord that comes with this unit has a 9.0v output at 200mA with the center pin being positive