08-07-2020, 01:43 PM
Jon
The 5Ah rating of your battery relates to a 20 hour discharge period, for which the load would be 0.25 amps. Being an alarm battery it would usually be maintenance charged from the alarm system, but on power failure it would keep the alarm working for 20 hours if it drew 0.25 amps. I believe electric pumps for cars draw about 4 amps, so simple arithmetic gives 1.25 hours running from a fully charged battery, but in practice it would probably probably be less than this because the battery is not designed for discharge at that rate. It may well be that an alarm system has a rather different charging characteristic from your Lidl charger which possibly is not suitable in this application. Some research on the Lucas website may reveal more.
The 5Ah rating of your battery relates to a 20 hour discharge period, for which the load would be 0.25 amps. Being an alarm battery it would usually be maintenance charged from the alarm system, but on power failure it would keep the alarm working for 20 hours if it drew 0.25 amps. I believe electric pumps for cars draw about 4 amps, so simple arithmetic gives 1.25 hours running from a fully charged battery, but in practice it would probably probably be less than this because the battery is not designed for discharge at that rate. It may well be that an alarm system has a rather different charging characteristic from your Lidl charger which possibly is not suitable in this application. Some research on the Lucas website may reveal more.