"PJO" wrote in message
...
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hi there,
i must agree with the person who said that putting batteries of this
type
in
parrallel is not a good thing for the stated reasons. however the
internal
charger in the alarm panel will be a constant voltage type with current
limiting, designed to float charge the battery, this means that the
current
will reduce to a small float level (trickle) when the battery has fully
charged. so i would say disconnect the small battery and the large one
will
be ok (just take longer to attain the full, float charge voltage so the
charger will be putting out its max current for longer)
regards
bob

********. The PSU is simply not capable of charging this capacity and it
should be disconnected NOW.

Even with the lower-capacity battery the panel is designed for its power
supply/charger is going to have to sustain its max output current for many
hours: long enough to cook a poorly designed PSU (not that I'm saying the
PSU might not be poorly designed :-). So with the larger battery the PSU
_should_ not suffer.

Putting two batteries of different ages and capacities in parallel is
probably not a good idea.

If you want a serious backup supply (maybe for emergency lights as well as
the panel) you could get a caravan/boat leisure battery (circa £30 for 85AH
from motorists discount centres) and a charger from Argos (£25 IIRC) which
will drop back to a maintenance charge for maintaining a float supply.

--
John Stumbles
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Thank God I'm an atheist