2GET "800-900mA" FRM A 9V BATTERY.....

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senthil_murugasan said:
GUYS....

HOW CAN I GET A CURRENT SUPPLY OF 800-900mA CURRENT FROM 9V BATTERY ........

I JUS GOT 8-10mA CURRENT .......
Click to expand...


No if you mean the standard small rectangular 9vdc batteries, their internal resistance would not allow that much current to flow. You would need a different kind of battery. AA batteries of the right type (6 cells in series) could supply that current level for a while.

Lefty
 
A 9v alkaline battery will deliver 800mA. We use them in Stun Guns and these need nearly 1A to produce the 150,000 volt spark.
 
A good quality brand new 9V alkaline battery can supply 800mA for a few seconds but its voltage will quickly drop as it dies.
A cheap Chinese battery that has been on a boat for a year will not.

I have extrapolated curves from Energizer's site. Here is a load of 400mA:
 

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https://www.panasonic.com/industrial/battery/oem/images/pdf/9V_Ind_Alka_Bat_Data_Sheet.pdf

a FRESH 9V has about a 3Ω internal impeadence. That means that the most instantanious power that you can get out of a 9V is (9V/6Ω)²×3Ω, and only for a split second.

On the other hand if you look at the actual curves, they do not even bother showing more than a 100mA load. The fact of the matter is that you can not project an order of magnitude and it does not take a constant nor high current to charge a stun gun...a taser on the other hand...

Dan
 
Of course you cannot get a high current from this type of battery for any more than a few seconds. But the enquiry was for 800mA from a 9v battery.
If more information was supplied, a fuller answer could be provided.
 
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