How old is your battery? Has it been overcharged?
The battery voltage at rest should read 12.8Volts when fully charged. If, when it is charging from the engine, the voltage exceeds 14.8Volts, suspect an overcharge as that will damage the battery and reduce its output power. I can't see there are any shorting problems as you would notice the hot wire smell.
I remember my old Honda 4 had a battery overcharging problem, many years ago, causing the side lamps to flatten the battery within half an hour. There was no regulator fitted to that old model, all it had was a large Zener Diode to stop the voltage going too high and mine was open circuit, boiling the battery!
Hope that helps.
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