More powerful Controller for e-bike

[ProDigit]

Hi,

I have the XTreme Xb-700li bike, and I tried to upgrade it by overvolting the bike, however the speed gains where marginal (about 1-2,5MPH for a 7,4V overvolt), and the regenerative braking did not work anymore.
The bike uses a 700W motor, and a 48V 20A battery (which I paired with another 48V 10A battery).
Both of them have double the amps in peak (48V 40A / 48V 20A).

I was thinking, if I upgraded the controller to one used for 1000W motors, would my bike accelerate and go faster?

Any recommendations?

 

[dnmun]

what was the peak current and minimum voltage on the wattmeter when you used the one battery on that controller and what is it when you use the two in parallel?

 

[ProDigit]

'bout the same. 2 batteries in parallel only for longer travel distance.
'Peak' wattage is around 960W (not including wattage spikes)