Battery Handbook

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ENERGIZERBATTERYMANUFACTURING
VERSION1.2
Figure7:ComparisonofPerformanceunderContinuousConstantPower
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AAAA PP355
25 mW 24 88
50 mW 11 38
75 mW 6 24
100 mW 4 15
Continuous Discharge Time (hrs)
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2.2‐‐PerformanceatOtherEnvironmentalConditions
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WhenaZincAirbatteryisexposedtoanon‐standardenvironment,adrivingforceforwatertransportin
oroutofthebatteryexists.Movementofwatervaporintothebatterycanfillvoidspaceintheanode
cavityun derhighhumidityenvironments,andmovementofwatervaporout
ofthebatterycandryout
theelectrolyteinlowhumidityenvironments.Eithersituationcandecreasebatteryperformanceover
time.
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Understanding the environmental conditions that a battery might encounter is critical to estimating
battery performance.A study was done at Energizer to determine realistic extreme conditions for
battery testing, using climate
 data from 61 cities across the globe.These cities represent the major
marketsforbothdevicesandbatteries.Combinationsofdailymorningandafternoontemperatureand
humiditywerecompiledandanalyzedtodeterminereasonabletemperatureandhumidityextremes.
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HotandHumidConditions
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ZincAirPrismaticbatteriescantakeonwaterwhenexposedtohotandhumidconditions.Thiscanlimit
batteryperformance by taking up void volume inthe air electrode and anodecompartment.At 35°C
and 75% RH conditions, there is a driving force for water gain larger than 99% of
 conditions seen in
combinedindoorandoutdoordatafromthetop61citiesglobally.ServicetestswiththePP355under
theseconditionsshowverygoodserviceevenat1hrperdayintermittency.
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HotandAridConditions
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Zinc Air Prismatic batteries can lose water when exposed to hot and arid conditions which can limit
batteryperformancebydryingoutthe battery.Under 35°Cand25%RHconditions,thereis adriving
forceforwaterlosslargerthan99%ofconditionsseenincombinedindoorandoutdoordata
fromthe
top61citiesglobally.ServicetestingwiththePP355attheseconditionsshowsverygoodserviceeven
at1hrperdayintermittency.
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