I bought a battery tester and battery charger to do maintenance of car and bike batteries.
The rate of bike battery is AH. Converting AH to CCA is to multiply 7.25. The battery rate is 8 AH. So I have 66 CCA (7.25 * 8).
Maintaining RPM at 3,000 for 10 to 15 seconds, the tester checked charging state.
I bought NOCO Genius 5 battery charger on Amazon.com.