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Is there a board that protects lead acid batteries from a short circuit. The capacity of my battery is 4,7Ah. My circuit is consuming about 3 amps.

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    \$\begingroup\$ A fuse, perhaps? \$\endgroup\$ – Hearth May 1 '17 at 16:56
  • \$\begingroup\$ Don't connect the battery leads together and don't make a board that causes the leads to connect together directly via copper traces. \$\endgroup\$ – user143136 May 1 '17 at 19:06
  • \$\begingroup\$ put a bulb in series so that a short just lights the bulb directly. \$\endgroup\$ – dandavis May 1 '17 at 20:47
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Just put a fuse in series with the battery, like so.

schematic

simulate this circuit – Schematic created using CircuitLab

It really doesn't get much simpler than that.

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  • \$\begingroup\$ what would be the value of the fuse \$\endgroup\$ – mrhassu May 1 '17 at 18:59
  • \$\begingroup\$ If you mean the current rating, pick one slightly above your designed operating point. \$\endgroup\$ – Hearth May 1 '17 at 19:03
  • \$\begingroup\$ so like a 5A fuse \$\endgroup\$ – mrhassu May 1 '17 at 19:08
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    \$\begingroup\$ You should use a fuse rated a little higher than the maximum current you expect the load to draw. Since we don't know what sort of load you have, we can't suggest a suitable rating. \$\endgroup\$ – Peter Bennett May 1 '17 at 19:41
  • \$\begingroup\$ how much current does a short circuit produce \$\endgroup\$ – mrhassu May 2 '17 at 11:12

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