Either my Car wiring is having issues and draining my car battery, or my D.I.Y stuff is incorrectly working and draining the battery.
Recently my car won't start if I leave the car for 4-5 days, Existing battery is Amaron FLO in my santro, Its a 2 yr old battery.
Over a jolly mood on a weekend, I went to the parking and car won't start, my DIY voltmeter was showing 10.5 volts or so, killing my mood, and I needed to reach somewhere on time, skipped the car and took an OLA. Once I was back, removed the battery from car and carried it along to my apartment.
Had a hardly used Inverter at home, and quickly plugged it in, luckily I didn't needed to boost it, as these UPS based Inverters won't start charging if battery is below 10v or so. Within a few hours, Battery charging stopped, another voltmeter was showing full, approx 13v or so upon initial connection, but was coming to 12v range in a few minutes.
Installed the battery back and it started in half a crank.
A week later this battery was down to 7v (Certainly current leakage) and this time Inverter didn't start charging, I was worried, spent weekend again without driving, but this time I had a 12v 2Amp power supply as the only option. On Tuesday night I connected it to car battery, and left it connected for 24 hours, Battery is back to 12.5v, and on Wednesday night disconnected the charger as slow charging was complete.
Now its been more than 24 hours since battery is left disconnected, I am still getting 12.4v on it. I am sure battery still has juice left and only thing I need to take care of is to prevent my Arduino & GPS to stop draining the battery.
I do have an Amplifier in car, but it doesn't turn on until HU is turned on, I am sure this is what prevents the Amp from draining the battery, but will try keeping this disconnected for a few days to see hows the battery drain looks now.
Made a small video about charging via Inverter, Don't have video for 2Amp wall charger video, but will make if I needed to charge the battery again.