Can stock x controller handle this additional power?no mention of it on the website 

efMX Trials Electric Freeride said:Lite Speed Bikes (usa) is offering a drop in 72V 30AH battery upgrade for surron..
(but I recommended to store and charge it outdoors..)
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https://litespeedbikes.mybigcommerce.com/72v-30ah/
"Rebuild of surron battery pack.
Surron upgrade battery pack.
20s10p Samsung 30q cells
200amp continuous pack, over 300amp peak
Bluetooth BMS for charging with 4 temp sensors.
Approx 1 week lead time from receipt of old battery pack.
Warranty:*Disclaimer Lite Speed Bikes LLC is not responsible for any accidents, fire outbreak, explosions or any kind of injury and damage to your bikes due to the use of our batteries and products. Please take all necessary precaution with the use of our products. 1 year warranty on battery non physical damage only.."
litespeedbike.com