Could Agree with Jeff – Does that 'battery' have a small hole, or gauze material, or some black cloth cover over the face opposite to the wires? It does seem to have such, in the very top photo?
On the other hand, the mic might be the item in the lower photo – the one with the black/red lead between the two halves, ending on the small PCB screwed to the lower half clamshell…
Where does that 'battery' sit? does it just hang in the breeze?
Nathan, we have many trail cameras out in the bundu here( Namibia northen desert regions) – they are in harsh conditions, desert sun, sand storms, etc – they are also carted off by hyena and chewed up…I inevitably end up being the one who (tries) to fix them – Not all have a backup battery – If there is CMOS backup, it is generally to save user specific settings ( photos interval, modes, etc) so that you don't have to re-enter all that guff when you change camera batteries. However, most of the later models use a serial data E*2 Prom – a form of non-volatile memory, and so no battery. So, in devices with backup battery, the failure of that battery normally does not prevent the device from starting up and showing user setup pages on the display…I would also suspect the display connections – some of the display have a silicon rubber/carbon graphite contact strip between the actual glass LCD contacts and the PCB and these have given me endless pain..
Hope you come right!
Joe