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Glossary: AGM

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AGMAcidAcid PackAcid StratificationActive MaterialAdvanced Flooded BatteryAlloyAmmeterAmp-HourAmpereAverage DrainBackfire ProtectionBackup BatteryBalancingBatteryBattery CareBattery CaseBattery CategoriesBattery HydrometerBoost ChargingCalcium BatteryCapacityCarbon AdditiveCellCell Short-CircuitCharge RegulatorChargerChargingCharging VoltageCircuitClosed BatteryCold Cranking Amps (CCA)Constant Current Battery ChargerConstant Current DischargerConstant-Voltage Battery-ChargerContinous TestCorrosionCurrentCurrent CollectorCutoff VoltageCycleCycle LifeCyclic LoadsCyclingCylindrical BatteryDamage due to Long Down-TimesDeep DischargeDeep-Cycle BatteryDegassingDepth of DischargeDirect CurrentDischarge RateDischargingDistilled WaterDouble LidDry-ChargedElectrolysisElectrolyteEnd of Charging VoltageEnhanced Flooded BatteryExpanded Metal GridFill LevelFlat PlateFloat ChargeFlooded BatteryFuseGas Recombinant TechnologyGassingGel BatteryGlass MatGridGroundGround CableHVTHybrid BatteryImmobilized ElectrolyteInternal ResistanceIonLead SedimentsLead SulfateLead-Acid BatteryLithium Iron Phosphate BatteryLithium-Ion BatteryLoadLow-MaintenanceM.A.S.S.MaintenanceMaintenance-FreeMemory EffectMultimeterNegative (-)Negative (-) PlateNominal VoltageNon-SpillableOpen Circuit VoltageOpen-Circuit VoltageOverchargingParallel CircuitPlacement of TerminalsPlatePlate PackPlate SetPolarityPole GreasePositive (+)Positive (+) PlatePrimary BatteryPulse ChargePure Lead BatteryRapid-Charge BatteryRecycling EffiencyResistorReversed PolaritySLI BatterySafety ReserveSealSealed Maintenance-FreeSecondary BatterySelf-DischargeSelf-Discharge RateSeparatorSeries CircuitSeries/Parallel CircuitService LifeShock-ResistantShort CircuitSilent LoadsSilverSmart ChargerSpacerSpecific GravityStandbyStart-Light-IgnitionState of ChargeStationary BatterySulfatingSuper-Heavy Duty BatterySupply BatteryTemperature Cut-offTerminalTerminal BridgeTerminal Pole TypeTerminal VoltageTraction BatteryTubular PlateUninterrupted Power SupplyUnwanted ResistanceValve-Regulated Lead-Acid BatteryVent CapVented BatteryVenting HoseVibrationVoltVoltageVoltmeterWattWatt-HourWet ChargedZinc-Air Cellkey-off drain
AGM

Absorbent Glass Mat
Battery class in which the electrolyte is bound in a glass fibre mat separator.

Because the electrolyte is fixed, an AGM battery cannot leak. It is also vibration-resistant because the separators swell after they have absorbed the electrolyte, thus protecting the grid plates from vibration and material loss. Extremely vibration-resistant heavy-duty batteries are often based on advanced AGM technology.
more about AGM batteries

In addition, because the glass fiber mats lie close to the electrodes, less active electrode material is lost during each discharge-charge cycle than in conventional batteries.

AGM batteries are used in cyclical and stationary applications such as telecommunications, wheelchairs, alarm systems as well as in classic starter applications and start-stop applications.

If your car with start-stop technologies had an AGM installed, you should definitely replace it with an AGM start-stop battery. An upgrade from EFB technology to AGM is always possible. Both start-stop batteries must be registered in the car's management system after installation.
to the purchasing advice for cars with a start-stop system

Synonym: Absorbent Glass Mat, glass fiber fleece, absorbent glass fiber mat, absorbent glass mat separator technology