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I just replaced a Harley battery with a YUASA, YTX20L-BS. It has the same construction, AGM, as the original, Harley battery. The charging information was on the top of the battery. It specified 13.00 volts as a full charge. A normal charge rate is 1.8A for 5 to 10 hrs. A quick charge is 9.0A for 1 hr. It is important not to let the battery get hot to the touch.

Here are some useful websites:

http://www.yuasabatteries.com/motor_battery.asp

http://www.rversonline.org/ArtAGM.html

Note the 14.0v maximum. Some auto chargers put an alternating current (AC) component on the output. You may wish to consider a charger designed for your battery to optimize its life. If you have accessories or an alarm make sure you don't need to disconnect them before charging the battery to prevent damage.

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15y ago
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Q: How do you charge 2004 Harley sportster battery?
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