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battery heads up

Picketwire

Well-known member
I see ads for batteries now that give a mWh rating instead of a mAh rating, that is, milliwatt hour rating instead of a milliamp hour rating. Watts are amps times volts so a mWh rating is much higher for the same battery. For instance, a 9 volt battery with a 200 mAh rating will have a 1800 mWh rating which sounds like a battery with much more capacity, but is not.

Also beware of BTY AA batteries, silver with blue band at bottom and blue writing, that claim 3000 mAh. 3000 is printed on the battery but doesn't specify mAh or mWh but when tested new only contained less than 400 mAhs. I wasn't aware of this because the ad claimed 3000 mAh and so I purchased 12 of them and wondered why they drained their charge quickly in my new Patriot. When I tested them on by charger, I found out why. Most were around 350 to 380 milliamp hour capacity and it didn't change all that much when I used "refresh" mode on them.
 

Odanscoils

Well-known member
I see ads for batteries now that give a mWh rating instead of a mAh rating, that is, milliwatt hour rating instead of a milliamp hour rating. Watts are amps times volts so a mWh rating is much higher for the same battery. For instance, a 9 volt battery with a 200 mAh rating will have a 1800 mWh rating which sounds like a battery with much more capacity, but is not.

Also beware of BTY AA batteries, silver with blue band at bottom and blue writing, that claim 3000 mAh. 3000 is printed on the battery but doesn't specify mAh or mWh but when tested new only contained less than 400 mAhs. I wasn't aware of this because the ad claimed 3000 mAh and so I purchased 12 of them and wondered why they drained their charge quickly in my new Patriot. When I tested them on by charger, I found out why. Most were around 350 to 380 milliamp hour capacity and it didn't change all that much when I used "refresh" mode on them.
Thanks. I didn't notice that.
 

thepest

Well-known member
pog (1).jpg
 

JimmyCT

Well-known member
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