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My problem turned out to be with the board and the output of the charger was too low. It needs to be about 27.5 volts. The transformer was okay but the circuit that controlled the output was bad and even with adjusting the potentiometer we could not get the charger to put out the correct voltage. The fix was a new board from Simplex. We got a deal as the tech that came out had the board on his van . Labor and parts were $1,100.00. We get a lot of spikes where we are in Arizona and suspect that a bit of a jolt from a spike or nearby lightning strike wounded the board. A surge protector can help but a hard hit will toast this board.The trouble sensor looks for a full output charge or it will show a trouble
Hope that helps
<p>I have noticed that, some users asked that, there old cameras always display low power warning for full charged new batteries, or there will be a low power warning after only taking 5-6 pictures.<br />
<p>If you have met this question (I wish not), I'd like to share the solutions.<br />
<p>The this problem are so common for <a href="http://www.digital-camera-batteries.net/canon.htm">Canon PowerShot</a> A series cameras when you try to powered your camera by Ni-MH batteries. This is because that, the camera judge the battery is power off by voltage of the battery. And if you use Ni-MH batteries for your camera, the Ni-MH batteries' voltage is lower than the Li-ion ones and close to the camera's judge voltage of low power, so the camera will warn you to change a new battery.<br />
<p>So if you use <a href="http://www.digital-camera-batteries.net">Li-ion camera batteries</a> this questions will be solved simply.<br />
<p>From <a href="http://www.pda-battery.ca/camera-tips/digital-cameras-low-power-warning-for-full-charged-new-batteries/">http://www.pda-battery.ca/camera-tips/digital-cameras-low-power-warning-for-full-charged-new-batteries/</a><br /></span><br /></span>
Are you sure it's indicating that the external battery is low? Quite often, they will warn you if the CMOS battery is nearly exhausted (these are like small watch batteries inside the case of the machine). It may simply be that this battery is nearly dead.
temperature affects batteries. if the batteries on the window sensors have been in use for some time it is probably time to change them. Alarm batteries are only expected to last 3 to 5 years with moderate use. If you have close neighbors or live in an apartment complex then false reads could be a factor.