Review on 🔋 Astron BB-30M Battery Backup Module by David Gibbs

I use many Astron devices as a radio operator. Need a backup battery module, have checked many of these and luckily I am missing a screw when purchasing. Replacement options are to ship the device back to the US for a replacement, which costs at least $50 via DHL/UPS. General ASTRON, please improve the quality. Now I need a "Columbus" screw that fits. Not happy at all.