power supply architecture datalogger

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hello,

i working on datalogger motorcycle. until testing on desk, it's time tests on scooter. have question way supply sensors , arduino.
i design architecture safe possible (fuses,...)

i using:
- arduino mega   7-12 v
- raspberry pi 3  5v
- gps  3.3v
- screen  5v
- imu  5v
- sd slot 5v
- steering sensor 5v
- front wheel speed sensor 12 v & lm393 5 v
- rear wheel speed sensor  12 v & lm393 5 v

of course use 12v native battery of scooter afraid of damaging current peak.

so thinking buy 12v rechargeable battery voltage converter 12v-5v.

or maybe suggestion?
do have idea how can determine capacity of battery?

thank you,
pm

anyone?


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