Purchased a NAPA The Legend Premium AGM Battery, group size 48 on November 27, 2023, to replace the stock AGM battery that came in my Honda Pilot 2017. The battery is rated for 760 CCA.
When I purchased the battery it has a shipping label of 8/23, and has some dust on top of it.
I guess it was an old stock, but it was 20 mins before my NAPA store closing time, and winter storm was coming in a day.
I just decided to accept it.
At home, I tested the battery using my Fluke 117, and it was giving a reading of about 12.3 volts.
Charged the battery inside the house for 3 hrs using my Schumacher in AGM setting until it reaches 99%, and unplugged the the charger.
In the morning I tested the battery, still unplugged, and I got 12.9 volt, and 855 CCA. Ambient temperature inside the house was about 70 F.
Installed the battery in the car, and everything was fine. The car is always park outside, and it is located in high desert Utah, where during normal winter, temperature can dropped to about 25 F.
I decided to test the battery health 2 months later, after the battery has gone thru several weeks of cold temperature cycles and probably about 200 start stop cycles, going around to office, store and so on. Average each trip usually is only 5 mins to 12 mins.
I got a reading of 712 CCA, which is a drop of about 9.3% from the stated 760 CCA on the label.
I tested the battery when the ambient temperature was about 40 F to 50 F, and car has been warmed up after some driving.
The battery state of charge was also only 80%. Honda alternator for some reason only keeps the battery at about 80% charge, possibly because my short commute. I topped off the battery charge while connected in the car using Schumacher, up to 100%, but SOH remains at 710 to 712 CCA
The car starts fine without issue, even during the coldest morning.
Honda "factory" CCA is at 650 CCA.
The car started fine even with the old Johnson Control factory battery, which was tested, then at 385 CCA.
Is this normal behavior for the battery's SOH to drop 9% in just 2 months, or maybe I get a defective battery?
I thought Cold Cranking Amp is rated at 0F. Ambient temperature was nowhere at 0F.
When I purchased the battery it has a shipping label of 8/23, and has some dust on top of it.
I guess it was an old stock, but it was 20 mins before my NAPA store closing time, and winter storm was coming in a day.
I just decided to accept it.
At home, I tested the battery using my Fluke 117, and it was giving a reading of about 12.3 volts.
Charged the battery inside the house for 3 hrs using my Schumacher in AGM setting until it reaches 99%, and unplugged the the charger.
In the morning I tested the battery, still unplugged, and I got 12.9 volt, and 855 CCA. Ambient temperature inside the house was about 70 F.
Installed the battery in the car, and everything was fine. The car is always park outside, and it is located in high desert Utah, where during normal winter, temperature can dropped to about 25 F.
I decided to test the battery health 2 months later, after the battery has gone thru several weeks of cold temperature cycles and probably about 200 start stop cycles, going around to office, store and so on. Average each trip usually is only 5 mins to 12 mins.
I got a reading of 712 CCA, which is a drop of about 9.3% from the stated 760 CCA on the label.
I tested the battery when the ambient temperature was about 40 F to 50 F, and car has been warmed up after some driving.
The battery state of charge was also only 80%. Honda alternator for some reason only keeps the battery at about 80% charge, possibly because my short commute. I topped off the battery charge while connected in the car using Schumacher, up to 100%, but SOH remains at 710 to 712 CCA
The car starts fine without issue, even during the coldest morning.
Honda "factory" CCA is at 650 CCA.
The car started fine even with the old Johnson Control factory battery, which was tested, then at 385 CCA.
Is this normal behavior for the battery's SOH to drop 9% in just 2 months, or maybe I get a defective battery?
I thought Cold Cranking Amp is rated at 0F. Ambient temperature was nowhere at 0F.