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 Battery current supply

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Senior Member 75+ Posts
Senior Member 75+ Posts

Join date : 2011-12-28

PostSubject: Battery current supply   December 9th 2012, 3:15 pm

Set up: I'm holding a 9-volt battery replacement ("wall wart") in my hand. Besides the output voltage, the label says 200 mA.

Question: I'm now holding a 9-volt battery in my hand, the rectangular kind you can buy anywhere. How much current is it good for?
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Beginning Member

Join date : 2012-07-06

PostSubject: Re: Battery current supply   December 9th 2012, 6:06 pm

Okay, what am I missing? What does the wall wart have to do with the battery? Are you asking the capacity of the battery or ultimate short circuit current capability?
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Cliff Jones
Site Administrator
Site Administrator

Join date : 2010-11-22

PostSubject: Re: Battery current supply   December 9th 2012, 6:27 pm

Primary (disposable)
Typical capacity (mAh) Nominal voltage


NiCd ------------------120--------------7.2- 8.4 (some)
NiMH ------------------175-300----------7.2- 8.4 9.6
Lithium-ion polymer-----520---------------7.3-

Wal-warts are used to run equipment and have a built in reserve capacity to run the electronics and charging battery(s) at the same time.
9 volt batteries can produce several amps , but just for a fraction of a second.
finding out what the capacity of a battery is can only be found by the company data sheets.
The more load on the battery the shorter useful life of the battery.
Just remember this some wall-warts are AC in and AC out, while others are AC in and DC out

I'm a Science Thinker, Radio Tinkerer, and all around good guy. Just ask Me!
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