Right Snap this is what I can see in wattage mod
At rest
View attachment 92190
Under load
View attachment 92191
The batteries do dip under load but that's normal for any mod what you are seeing on my screen is output information. Don't confuse this information with actual battery amp draw though the input current will be lower
Input draw the one you care about for selecting batteries
watts / number of batteries / low voltage cut off per battery (3v on the speeder) / chip efficiency
So
71 / 2 / 3 / 0.95 = 12.4 amps
Or in your case
55 / 2 / 3 / 0.95 = 9.64 amps
So unless you are caining this above 115w you won't need the VTC5a battery
a 3000mah battery like the 30q or VTC6 will suffice and get best run time on here for you