Originally Posted by
robtown
I have/had a couple of these & they are very bright. Recently, they've gone out or dim when the batteries were relatively new (i.e. recharged). That may be an issue with the NiMh batteries - or not. ...
If you have a voltmeter, check the battery voltage when the lights get dim. It's likely that you have a dying battery. Generally, both batteries loose voltage (i.e. charge) at a similar rate, but when one is dying, you can read 1-1.2 V for one battery... and a mere 0,6 V for the other. Replace the weaker one and you should be OK.