I have had one 100ah SOK BT/non-heated battery from SOK, that for the past year, has been great. Decided to get another one 3 months ago and went with the heated version. I hooked them up in parallel and had discharged around 40amps, with a 10amp draw, both BMS BT radios reporting 5 amps being drawn each, cell balance on all 8 cells looking great. All of a sudden the "new" BMS BT stopped showing up in the app. I thought for some reason that BMS went to sleep, put 14.4v across the terminals, nothing, reading 10.9v while the other battery read 13.25v. Switched BMS's, now my older battery showed 10.9v, obviously the BMS. SOK have been running me around from Sales to their Tech support, which is impossible to get a hold of. I know Mr Prose hyped these guys, the battery IS well made, but the support is crap. Would not recommend. Don't take my word, just Google their support. Since their support is of no help, if anyone has any ideas as to what is failing in my case, or other troubleshooting steps, I am all ears.