Video of my dummy load eevblog topic:
[ Ссылка ]

After this movie i tested my load on a lead acid battery and because i use a 1 ohm 100w resistor i cant get the max current possible.
The voltage of the battery was 10.4V , i could go up to 7A max.
Then i replaced my 1 ohm resistor with a 0.1 ohm 3W resitor and i went up to 20A (until my rigol dm3058 fuse broke) .
So with a few little adjustments you can use it to test battery.

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