My car (a 2007 Honda CRV) has been intermittently starting hard, almost like the battery was almost dead but then it kicks in and is fine.
About 2 weeks ago I came out to the parking garage after work and it was dead. not completely dead just it spun up the starter and you could tell it wasn't quite charged enough because the starter slowed down very quickly and then eventually wouldn't even crank it over. I got the car jumped that time, but to get enough charge off the jumper cables we had to keep the RPMs up for about 5 min and then it only was just enough.
I went straight to our local repair shop and had them test the battery and alternator. Both checked out fine but when he first was checking it read unstable for a few seconds and then corrected itself.
From there I drove it about 20 miles, shut it off for about 20 minutes and it started right back up and I drove it home – roughly 20 miles.
It was good for about a week, then after that for about the next week it would do the intermittently act like it's drained thing but actually not start. At some point I noticed some mild corrosion on the positive terminal and thought it might not be getting a good connection. During the past week whenever it wouldn't start I would just pop the hood and twist the cable on the terminal just ever so slightly and the car would start right up.
Today I decided I'd clean the terminal and tighten the connections. After taking some Baking Soda and Water to the corrosion and terminal connection I cleaned and dried things up real good and now it won't start at all. The starter still tries to kick on but it never draws enough power to turn over.
I ran a trickle charge to the battery for about 3 hrs today (which is obviously not enough but it was just to see if it would give me anything at all) but still nothing. I checked the battery and it's at about 12.5 volts. My multimeter is a light duty job so I'm not that excited about putting it inline to measure the amp output while trying to start it but I think I measured it at about 100-ish amps while the car was turning 'on' (not starting). I believe the cold cranking amps on the battery is 400 something.
Where do I go from here?
Forgot to mention, the battery is only 19 months old. Warranty is 20 months full replacement. Not that it's all that relevant for troubleshooting but it seems odd it would go bad so soon if it really is anything to do with the battery itself.