I recently bought a Sealey BT2020 Battery Monitor. This was described as a BM6 in a BLE sniffer. After much digging I found this post and an ESPHome configuration that just worked! Couldn’t find any reference to it on the forum.
Oh, good to know! I wonder how many other names the BM6 goes by. I’ve added a note on that blog post with the fact it’s also known as the Sealey BT2020. Thanks!