Sealed Gel Cell - Bosch PLN-24CH12 Installation And Operation Manual

Battery Charger
4.7.3

Sealed gel cell

Gelled lead-acid batteries predate the AGM batteries but are losing to AGM. They have many
of the same advantages over flooded lead-acid batteries including ease of transportation, as
the AGM type, except the gelled electrolyte in these batteries is highly viscous and
recombination of the gases generated while charging, occurs at a much slower rate. This
means that these batteries typically have to be charged slower than either flooded lead-acid
or AGM batteries.
In an emergency sound system you have a fixed amount of hours to charge the batteries from
the EN54-4. If charged at too high a rate, gas pockets form on the plates and force the gelled
electrolyte away from the plates, decreasing the capacity until the gas finds its way to the top
of the battery and is recombined with the electrolyte. For use in a system where discharge
rates are less than severe, gel batteries could be a good choice.
Bosch Security Systems B.V. Installation and Operation manual
Planning information | en 15
180110011Aa | V1.1 | 2011.05