ADT Galaxy 16 Plus overcharging backup battery

SMG

SMG

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Hi,
Whilst having a new consumer unit fitted, I noticed the alarm went off, normally the back up 12v battery keeps it monitoring, but on inspection, I noticed the battery had swelled in the middle, & was dead. Checking the output voltage from the alarm, I read 15.8 volts. As an ex mechanic I know 14.4 is about right, & the swollen batt is probably due to overcharging. I cant find any info on this circuit board or its mains transformer, any help would be appreciated. TIA.
 
Hi,

I'm afraid I don't know anything about the charging system in your alarm panel.
But, I can say that multistage chargers for sealed lead acid batteries can often be quite sophisticated.

A no-load voltage of 15.8V may be fine, if the charger is in a constant current charging mode, and has reached its upper voltage limit.

Hopefully someone who knows the system will be able to give you a definitive answer.
All I can say, is the charger may be working as intended! :)
 
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Check output from battery leads ( with battery disconnected ) , if it is 15.8 v then it’s time to replace the alarm panel ….it should be 13.8 v dc or near abouts…
Not sure if the old galaxy panels have a voltage adjust pot ?
 
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Sparkymarka, Thanks for that, my mainboard is different & only as the volume adjust.
 
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Time for a new alarm …..if you are wanting to stick with the galaxy I would ask galaxy guy what’s the best option on the galaxy range these days ….or if your thinking of something else come back on here …
 
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Could anyone advise if there is a later, or better model motherboard I can use, really don't want to start changing the rest of the components.
 
Might have a galaxy 16+ pcb kicking around at work ….as before galaxy may be able to guide you as what your options are …
 
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Sparky, any help would be appreciated, I also have a second board, which supplies the correct charging voltage of 13.8v, but connecting it it just shows 16 stars on the keypad I there a way of resetting this other board?
 
I would drop galaxy guy a message as I’ve not fitted galaxy since the 16+/60/ 500 days early 2000s
 
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