Just wanted to mention 2 things.
My GG Live unit would no longer hold a charge so I purchased a 603048 3.7V 900mAh LiPo battery(w/pcm) on ebay to replace the oem one. I believe there are multiple versions of the belt clip. Mine has the clip with the flat profile. There are 4 screws (tiny torx T6) that must be removed to open the unit. 2 of them are partially covered by the clip so it must be removed. That was the most difficult part. There is a piece of spring steel molded into the clip. You can slide a tiny flat head screwdriver or something similar between that spring steel and body of the unit, pry it up and slide the clip off. Then remove the screws to access the battery. If you don't want to do that, you could probably use a dremel to carve small notches in the clip to allow clearance for the torx tool. The battery is adhered to the main circuit board, so pry up gently/slowly to release it. Cut the wires, solder on/shrink tube the new battery's wires, put some mounting tape on the new battery and adhere it to the original location. Reassemble and you're done. Works like a champ.
One of my tags stopped being recognized so I read the FAQ page on their website, clicked on the link that is supposed to bring me to a page where I can purchase another one, but the link was dead. I emailed them with a photo of the tag showing no physical damage. Today, 17 days later, they replied stating that they will send me a replacement.