Whilst the rig is very rugged to handle you will have seen how the removable batteries are not rigidly restrained - and face rearwards.
Well I'm not so clever as I thought because some batteries can slightly shift for a millisecond and break electrical contact if you knock the device hard. That's no problem for a spotter but if it occurs with rifle recoil shoulder arrest it takes about a second for the monitor to restart.... just in time to miss the bullet strike.
After many attempts to resolve the issue I have found there are umpteen different 18650 battery diameters and lengths which affect the gripping tension of the battery holder in a way that simply cannot be relied on for all battery brands.
Since the issue has been found I have changed the battery carriers to stronger gripping one's and put some foam strip behind the monitor to dampen battery movement - but have not used one under heavy recoil. My largest calibre is only a tiny 17REM LVSF and I'm not totally happy about offering them for centre-fire calibre use.
I'm therefore feeling I can only recommend the Kwik-Fit Add On for rimfire and pcp rifle use.
















