Do you know what range you currently get? The real range of any battery, including what the manufacturer claims, depends on rider weight, speed, and road conditions. If you know what you currently get then we can work out what mileage you get per Wh (the unit of energy in a battery) and give a decent estimate for what the max range would be for a bigger battery. Unfortunately it looks like this battery won’t fit in the current enclosure so you’d need to find something that fits as well.
Dimensions here