DC Motor running too slow

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hi, new arduino , coding. attempting project need dc motor run , can vary speed. using arduino mega 256 l298n bridge. motor use has following specs.
voltage: 12 volt dc
no load rpm: 5,310 (+/- 10%)
free current: 2.7 amps
maximum power: 337 watts (at 2655 rpm, 172 oz-in, , 68 amps)
stall torque: 2.42 n-m, or 343.4 oz-in
stall current: 133 amps

http://www.andymark.com/motor-p/am-0255aus.htm

i use 12 volt battery bought amazon.

https://www.amazon.com/gp/aw/d/b0075vq9os/ref=ya_aw_od_pi?ie=utf8&psc=1

when connect motor directly battery runs high rpm, when connect l298n, speed of 255 arduino motor runs slow , stalls , stops. keeps winning. tried changing speed through arduino, whining sound change, speed doesnt. question other parameter should need control/change increase motor speed.

thanks in advance help!!

regards,
sid

one key thing missing here, how's overything connected? where's schematic?

btw, l298n able drive 2a per channel. can parallel both channels 4a have right. motor wayyyyyyyyyyyyy heavy poor driver :( need pretty beefy motor driver handle 133a stall current!


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