no other markings. The other issue is that there are no cell balance leads, and it is apparently an uncommon connector for a Lipo (I talked to a guy from an RC hobby shop to see if they had anything comparable). It is the 8 allenhead screws on bottom. The battery is taped to the top shell with a really sticky 2-sided tape. The PCB is mounted to the bottom plate with two small phillips screws. Disassembly/reassembly was really easy.
If its a 7.4v battery then it must be a two cell battery, if it doesn't have a balance tap, only two wire + and - then it must have a built in battery management circuit.
If you take the heatshrink off, very carefully, don't puncture the cells, then you should be able to see the BMS circuit. I suspect one of the cells in that pack is faulty the other one is probably still OK so > 3v.