Low voltage battery
I have a Honda CRV 2018. A dashcam somehow drained my battery (original) overnight and I was able to recharge it. After charge, the voltage (multimeter) usually reads 12.2 V. Thinking it was time for a new battery after 5 years, I bought a Topdon BT50 tester. All the parameters are good. The tester shows "charge good" but shows at 38%. The battery is rated at 550 CCA and the test gives 552 CCA. The car starts with no issues.
Should I replace the battery? If not, the battery being at a low voltage all the time, will this damage the alternator or charging system?
How is it possible that at such discharge stage, the battery still gives the full rated crank amps?