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Good News. With the info from Alexliu I ordered 2 x “3.7v 2500mAh 505068 “ off eBay. They arrived in a short time and I pulled apart the door bell to install the new batteries.
The batteries I purchased came with a breakout PCB on the end of them. I left this board on both since it was well attached and moved the PCB from the original battery since it seems to have a few components on it over to the new 2x pack now wired in parallel . Managed to fit it all back with some Kaptop tape to snug up the PCB and the wires. Tricky part is to be careful with that connector.