If the battery is acting normally, I'd submit as a bug to Apple and like you say, monitor it for warranty. I normally don't pay attention to battery info, but there have been many reports of weird things being reported in various monitoring pulls.
Code:
ioreg -w 0 -f -r -c AppleSmartBattery
For instance, mine is reporting amps like this
"InstantAmperage" = 18446744073709551458
Output of my machine just prior to dropping it at Apple:
+-o AppleSmartBattery <class AppleSmartBattery, id 0x100000624, registered, matched, active, busy 0 (47 ms), retain 7>
{
"PostChargeWaitSeconds" = 120
"built-in" = Yes
"AppleRawAdapterDetails" = ()
"CurrentCapacity" = 25
"PackReserve" = 130
"DeviceName" = "bq20z451"
"PostDischargeWaitSeconds" = 120
"OCVData" = {}
"LPEMData" = {}
"CarrierMode" = {"CarrierModeLowVoltage"=3600,"CarrierModeHighVoltage"=4100,"CarrierModeStatus"=0}
"TimeRemaining" = 176
"ChargerConfiguration" = 0
"IOGeneralInterest" = "IOCommand is not serializable"
"IOReportLegend" = ({"IOReportChannels"=((7167869599145487988,6460407809,"BatteryCycleCount")),"IOReportGroupName"="Battery","IOReportChannelInfo"={"IOReportChannelUnit"=0}})
"AtCriticalLevel" = No
"BatteryCellDisconnectCount" = 0
"UpdateTime" = 1608922217
"Amperage" = 18446744073709551257
"AppleRawCurrentCapacity" = 1049
"AbsoluteCapacity" = 0
"AvgTimeToFull" = 65535
"ExternalConnected" = No
"ExternalChargeCapable" = No
"AppleRawBatteryVoltage" = 11220
"BootVoltage" = 0
"BatteryData" = {"Ra03"=0,"Ra10"=0,"CellWom"=(0,0),"RaTableRaw"=(<0055005c004d004f005f00730054006400660065006b0070008400d601af02ab>,<00000061005100550067007b006100730071006c006f0077008900d601c202c4>,<0055006c005c0063007b008e006c007e007f0078007a007d009400df01bc02c3>),"Qstart"=0,"AdapterPower"=956350296,"DailyMinSoc"=25,"Ra04"=0,"Ra11"=0,"CellVoltage"=(3741,3742,3738),"PackCurrentAccumulator"=18446744073701878976,"PassedCharge"=370,"Flags"=16777217,"PresentDOD"=(72,72,72),"Ra05"=0,"Ra12"=0,"FccComp1"=4317,"ChemID"=10037,"iMaxAndSocSmoothTable"=<0000000000000000000000000000000000000000000000000000000000000000>,"FccComp2"=4317,"PackCurrentAccumulatorCount"=312852,"DOD0"=(10624,10624,10624),"Ra06"=0,"ResScale"=0,"Ra13"=0,"WeightedRa"=0,"FilteredCurrent"=0,"RSS"=0,"CellCurrentAccumulatorCount"=0,"DailyMaxSoc"=90,"Ra07"=0,"Ra14"=0,"MaxCapacity"=100,"ChemicalWeightedRa"=0,"Ra00"=0,"BatteryHealthMetric"=0,"DesignCapacity"=4382,"Ra08"=0,"BatteryState"=<000000000000000043e40002c2000000>,"CellCurrentAccumulator"=(0,0),"AlgoChemID"=10037,"MfgData"=<00000000100200012735000003313731033030320341544c001b000000000000>,"ManufactureDate"=60680123267122,"ISS"=18446744073709551267,"Ra01"=0,"Soc1Voltage"=0,"QmaxDisqualificationReason"=0,"ChargeAccum"=0,"SimRate"=0,"Qmax"=(4593,4604,4622),"PMUConfigured"=0,"ITMiscStatus"=0,"StateOfCharge"=25,"Ra09"=0,"GaugeFlagRaw"=192,"CycleCount"=9,"Voltage"=11222,"SystemPower"=1081779212,"LifetimeData"={"Raw"=<00000000000502480000003600000000003ecc780000e447b24000000000000001d5001410fd0d3e32ef280608d0f5320a6ff407fc94fc0000d2000047730002>,"UpdateTime"=1608922217,"ResistanceUpdatedDisabledCount"=0,"TimeAtHighSoc"=<000000005b0000000000000000000000>,"TemperatureSamples"=18291,"TotalOperatingTime"=1143,"MaximumDischargeCurrent"=18446744073709548850,"MinimumPackVoltage"=10246,"MaximumPackVoltage"=13039,"MaximumChargeCurrent"=2256,"AverageTemperature"=18446744073709551570,"MinimumTemperature"=20,"RDISCnt"=0,"MaximumTemperature"=469},"Ra02"=0}
"BatteryInstalled" = Yes
"IOReportLegendPublic" = Yes
"AppleRawExternalConnected" = No
"KioskMode" = {"KioskModeLastHighSocHours"=0,"KioskModeFullChargeVoltage"=0,"KioskModeMode"=0,"KioskModeHighSocSeconds"=0,"KioskModeHighSocDays"=0}
"NominalChargeCapacity" = 4382
"FullyCharged" = No
"FullPathUpdated" = 1608922097
"ManufacturerData" =
00000000: 00 00 00 00 10 02 00 01 27 35 00 00 03 31 37 31 03 30 30 32 03 41 54 4C 00 1B 00 00 00 00 00 00 ........'5...171.002.ATL........
"ChargingOverride" = 0
"BatteryInvalidWakeSeconds" = 30
"ChargerData" = {"ChargingCurrent"=0,"NotChargingReason"=128,"ChargerStatus"=45194,"ChargingVoltage"=4299,"VacVoltageLimit"=4350,"ChargerID"=18446744073709551615}
"BootPathUpdated" = 1608609520
"DesignCycleCount9C" = 1000
"AdapterDetails" = {"FamilyCode"=0}
"MaxCapacity" = 100
"InstantAmperage" = 18446744073709551257
"GasGaugeFirmwareVersion" = 1
"AdapterInfo" = 0
"Location" = 0
"Temperature" = 3014
"AvgTimeToEmpty" = 176
"BestAdapterIndex" = 254
"DesignCapacity" = 4382
"IsCharging" = No
"PermanentFailureStatus" = 0
"Voltage" = 11220
"UserVisiblePathUpdated" = 1608922217
"CycleCount" = 9
"AppleRawMaxCapacity" = 4317
"VirtualTemperature" = 2819
}