So, I am trying to build a little robot mower, and getting all parts. So I recently buyed two DC 12V motors, here is the specs:

dc geared motor 12v specs

Now I am trying to calculate how big or which battery should I use, and here is my confusion:

Why unload current is way bigger than rated current inside specs?

And which one should I use in calculation for a battery?

Thanks in advance!

  • 2
    \$\begingroup\$ From a few google searches it looks to be a poorly documented chinese motor. IMHO it means "stall current" but poorly translated. \$\endgroup\$ Dec 29, 2020 at 22:13
  • \$\begingroup\$ You can expect a mower to stall when it encounters long grass or junk, so the battery should be rated to handle the stall current short term (peak current) though the continuous current rating can be lower. \$\endgroup\$
    – user16324
    Dec 29, 2020 at 22:23
  • \$\begingroup\$ If it is really stall current, that means I should find H Bridge that can perform 40A short term, and a battery to support it. \$\endgroup\$
    – Peky27
    Dec 30, 2020 at 9:30


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