Adobe flash doesn't work for everyone and I, for one, don't use it. Love more info on charging the Excalibur and what the video might say on the topic. My rule of thumb is to charge twice the run time. For example, if I MD for 6 hrs I'll charge it for 12 hrs. One for one isn't enough and after time the battery will run down. There are numerous stories of the Excalibur battery not lasting long, but if you charge right and DO NOT keep it plugged in for days or weeks at a time the battery should last. I have used mine for over a year now and just put 12 hrs of heavy detecting on it and the battery was fine. I'm now charging it for 24 hrs. You also have to condition the battery and let it run down and then fully recharge it, perhaps a few times a yr.
The charger and battery that come with the unit have been described by others as “useless”. I used to charge the unit on a 1:1 basis but the original charger and battery have no indicator of how much the battery is charged; as a consequence, I ran the MD low, giving me experience in the signs of low battery power of the unit:
1. Unpredictable, random, 1-2 second whine sound; not any of the usual detecting sounds of the unit and it cannot be repeated at will.
2. No threshold control. Unit produced a constant and fairly loud "threshold" sound as soon as the unit was turned-on (ie knob positioned just past "on" position at 9 O’clock.) or after a few minutes of use. Usually, my threshold signal is about 1pm. As the battery wore down the threshold sound increased in loudness.
3. Unit lost volume control - a constant loud "threshold" sound was heard regardless of where the volume knob was turned.
4. Unit could still detect certain targets, but the loud uncontrollable threshold sound prevented continued use.
I recharged the battery for 20 hours and the unit worked as new.