Years ago, someone had installed two Tripp Lite APS2012SW 2000W 12 volt pure sine inverters connected to (one each) VMAX 200ah AGM batteries. These were connected to two circuits in the house and worked great for protecting various tv's, computers, etc around the house (we live in Texas, so you know our grid quality). Well, the batteries were past their prime, so I purchased two of Battery Hookups 100ah batteries made of prepacked 32650 cells. A friend volunteered to change them out and I thought he knew how to do it safely. Hardly. He just pulled the old batteries out and connected the new ones. No turning off breakers or inverters--nothing. The batteries have JBD bms on them, so I can connect through bluetooth and that shows the batteries are ok, but the inverters will not turn on. Did my friend fry them? Is there a way to fix this or do I just need to cough up the cash for two new inverters? Thank you.