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For example, I have a motor that needs a surge of 2.5A for a short amount of time from a 6V power supply.

Will any 6V battery able to supply that current? Even if let's say it has only a 500mAH. How does AMP rating matter when talking about this?

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  • \$\begingroup\$ The DCR of the motor must be much higher than ESR of the battery . A 9V cell is higher. What is the motor DCR? And battery ESR=Voc/Isc \$\endgroup\$ – Tony Stewart Sunnyskyguy EE75 Jul 13 '18 at 22:58
  • \$\begingroup\$ Do you mean "9V battery" (i.e, PP3) in your question, or some other type of battery? If the latter, what kind? \$\endgroup\$ – duskwuff Jul 13 '18 at 23:00
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    \$\begingroup\$ related (if not duplicate): Battery Ampere-hour rating vs Battery Amps \$\endgroup\$ – Nick Alexeev Jul 13 '18 at 23:18
  • \$\begingroup\$ Conventionally you'd want a battery rated for high discharge current. However, particularly if you can anticipate the need, you may be able to do something with capacitors that you charge up slowly to deliver a brief current pulse. \$\endgroup\$ – Chris Stratton Jul 13 '18 at 23:29
  • \$\begingroup\$ a 9V battery is made from six AAAA cells .... it has a lot of internal resistance .... it does not produce much current as a result \$\endgroup\$ – jsotola Jul 14 '18 at 1:38
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You might want to use rechargeable NiMH batteries instead of alkaline cells.

This Energizer AA NiMH cell is specified for 4.6A continuous discharge current, for example - way more than typical alkaline cells can provide. It'll probably provide even more current for a few seconds. Plus, you can recharge it!

Five of those in series and off you go.

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For a common 9 volt battery - almost certainly not

4 AA alkaline cells (6 volts) - possibly

4 C alkaline cells (6 volts) - much more likely (although I've seen some C cells that have the same specs as AA cells)

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