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I'd give the battery a good charge overnight with an auxiliary charger, then make the following simple test.
At least three hours after I had fully charged the battery, and removed the auxiliary charger, I'd hook up a voltmeter to the battery + and - terminals, and take the following readings.
- The voltage just sitting, with nothing turned on, will show me the state of charge and/or condition of the battery.
- The voltage when I switch on the ignition and headlight comes on, is also of interest.
- While holding the start button in to crank the engine, voltage will drop to some lower value.
- Finally, after starting, and running fast (~2000 rpm) with the choke on, the voltage should rise to its highest value.
From these numbers, we can tell a lot about the battery, and the charging system.
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