My wife mentioned the CR-V was cranking slow and I load tested the battery and it seemed to do alright. I bought a Topdon BT600 battery tester and the first reading I took said the battery was 5% charged at 12.03V and was measuring 408 CCA, the cranking was low at 1616ms and it dropped to9.04V. Charging system said normal at 14.3V. I put a battery charger on the battery and it said replace when it was fully charged so I went and bought a new battery and put in. Now I'm getting a charging system low reading and I can't understand why when the only thing I did was put a charger on it. Nothing arced or sparked and nothing got anywhere near the alternator. Any idea why it would go from14.3 to around 13v with the vehicle running? The alternator or battery light is not on.