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Recently I left my phone on charge inside my car - engine not running, but with radio turned on with no sound. When I returned 75 minutes later the car battery was flat, only showing dash-lights which then also disappeared when I turned the key a second time.
The battery is at least 5 years old but in seemingly good condition that I never have any problems with it: I had driven about 600 miles in the preceding two days so would have expected it to be well charged.
My question is obviously, how can a 2Ah battery flatten a 60Ah battery so quickly ? I do recall a similar incident back in the late 80's where I sat listening to the car cassette-player for more than an hour and was also taken aback when that also flattened the battery.
The battery is at least 5 years old but in seemingly good condition that I never have any problems with it: I had driven about 600 miles in the preceding two days so would have expected it to be well charged.
My question is obviously, how can a 2Ah battery flatten a 60Ah battery so quickly ? I do recall a similar incident back in the late 80's where I sat listening to the car cassette-player for more than an hour and was also taken aback when that also flattened the battery.