The other type of battery to give troubles are the ones fitted to intruder alarms, though lead acid they do need to be changed & checked regularly if not all sorts of problems start.
1/ If your mains supply goes off the system seems to activate, often as the sounder (siren etc.) has its own battery, sees the loss of power as the back up in the control panel is knacked and can't be reset.
2/ And this is possiblt the worst (funniest) is all is OK until power is restored, lost count of the number of times I've restored power late at night/early hours for half the alarms in an area to go off - usually followed by us staging a strategic withdrawl
Had a look at one last year that did this (old lady on her own) the battery was a/ without any electrolite b/ had a hole in it & c/was deformed through heat.
So take the time to check yours and re[place every few years.
These are sold as a high capacity battery unit for jump starting, or deep cycle applications.
Can be seen in many locations in the UK, don't be tempted to buy a cheap one, I got given one and no way will it start my car (1.9l diesel). Go to a car parts specialist and get a decent one.
ABX maybe we should set up as consultants
