[quote name='John-E-Retro' post='102035' date='Dec 10 2007, 09:57 AM']I have a 9V /18V battery low indicator, you can see a post about it in the retro forum [url="http://basschat.co.uk/index.php?showtopic=4862"]low battery indicator thread[/url]
It's a circuit board about 1" square, currently.
The way it works is very simple:
* It sits there taking a tiny amount of current, a few millionths of an amp when the battery is good.
* When the battery system (9V or 18V) starts to decline, but there is still some life, a high brigthness LED starts to flash around once per second. But again the power consumption for the LED is very tiny since the LED is on for just a few millionths of a second. The eye sees that and image retention of the human eye makes it seem to be lit for longer and can easily see the flashing.
So unlike some systems, where a low battery LED is turned on full, which drains the battery much faster and may even take more current than the electronics, my unit takes on average, a few 10s of millionths of amps, still an insignificant drain to indicate the battery is low.
Have them in stock £25.00, with black or chrome LED surround.
John[/quote]
Sounds good, will have to take the electronic cavity lid off to see if the unit will fit, there's certainly no room in the battery compartment.