18
Glossary
What is a GEL battery
Agelbatteryisalead-acidelectricstoragebattery
that:
— is sealed using special pressure valves and
shouldneverbeopened.
— iscompletelymaintenance-free.
— usesthixotropicgelledelectrolyte.
— usesarecombinationreactiontopreventthees-
capeofhydrogenand oxygengasesnormally
lostinaoodedlead-acidbattery(particularlyin
deepcycleapplications).
— isnon-spillable,andthereforecanbeoperated
invirtuallyanyposition.However,upside-down
installationisnotrecommended.
Connectionsmustberetorquedandthebatteriesbe
cleanedperiodically.
What is an AGM battery?
AnAGMbatteryisalead-acidelectricstoragebat-
terythat:
— is sealed using special pressure valves and
shouldneverbeopened.
— iscompletelymaintenance-free.
— hasallofitselectrolyteabsorbedinseparators
consistingofasponge-likemassofmattedglass
bers.
— usesarecombinationreactiontopreventthees-
capeofhydrogenand oxygengasesnormally
lostinaoodedlead-acidbattery(particularlyin
deepcycleapplications).
— isnon-spillable,andthereforecanbeoperated
invirtuallyanyposition.However,upside-down
installationisnotrecommended.
Connectionsmustberetorquedandthebatteriesbe
cleanedperiodically.
What is a VRLA battery?
AvalveRegulatedLeadAcidBattery.Thistypeofbat-
tery
issealedmaintenance-freewitha"Bunce"valve
orvalvesinthetopofthemwhichopenswhenapre-
setpressureisrealizedinsidethebatteryandallows
thegaspressuretoberelieved.Thenthevalveresets
itself.
What is a SLI battery?
TheseinitialsstandforStarting,LightingandIgnition,
whicharethethreebasicfunctionswhichabattery
hastoperformonallnormalvehicles.Batteriesgiven
thisdescriptionwillhavebeenspecicallydesigned
forserviceoncarsandtruckswithinavoltagecontrol-
ledelectricalsystem.Those SLIbatterieswhich are
intendedforheavyhaulagevehiclesttedwithlarge
dieselmotorsareoftenbecalled
commercial
batter-
ies.Theyhavetobemuchmorepowerfulandmore
robustthanbatteriesintendedforcars.
What is state of health?
It standsfor how muchbattery capacity isleft (%)
comparingwiththemarkedoriginalbatterycapacity.
What is state of charge?
Itshowstowhat anextendthebattery capacityis
actuallycharged(in%).
What does CCA mean?
Thecurrentinampereswhichanewandfullycharged
batterycandeliverfor30secondscontinuouslywith-
outtheterminalvoltagefallingbelow1.2voltsper
cell,afterithasbeencooledto‒17.8°Candheld
atthattemperature.Thisratingreectstheabilityof
thebatterytodeliverenginestartingcurrentsunder
winterconditions.
What does am
pere hour mean?
Thisisthe measuring unit for electrical capacity. A
currentofoneampereforonehourimpliesthedeliv-
eryorreceiptofoneampere‒hourofelectricity.Cur-
rentmultipliedbytimeinhoursequalsampere‒hours.