Spot on, FLIR has had major issues for repair service since they have been sold to Teledyne. The best companies are Pulsar and AGM at this time regarding ease of use, resolution and storage factors.
The majority of AGM units can be bus-powered off a power bank for 5 hours ( on-board memory ) for overnight use. I highly recommend Pulsar for a higher grade unit, they are sturdy and have great sensitivity along with accurate battery life at 8 or 16 hour use. The customer support is great also, no complaints from my experience.