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BATTERY TESTING - OPEN CIRCUIT VOLTAGE TEST

This information is from the Yuasa battery Technical Manual.

The stock battery “Yuasa YTX7L-BS is an Absorbed Glass Mat or AGM battery” Sometimes referred to as maintenance-free batteries.

First charge battery, battery must be fully charged, either by using the m/c’s charging system or a battery charger. A small 1 amp or so Automatic Charger, (battery tender jr.) or similar is recommended.

Charging creates a “surface charge” across the battery’s cells. The surface charge must be removed before an accurate test for open circuit voltage can be performed. To remove the surface charge, turn on the key for about 3 minutes then turn it off. Now let the battery set for about 10 minutes. This step is not necessary if the battery has been sitting for 1 hour after charging.

Connect voltmeter to battery terminals. Open circuit voltage for a fully, 100% charged AGM battery is 12.8 to 13.0 volts. AGM batteries that are 75% to 100% charged will measure 12.5 to 12.8 volts.
Any voltage below 12.5 volts may indicate a bad battery. Consult the Yuasa battery Technical Manual that can be downloaded from their website for more tests to confirm a bad battery.

Conventional batteries (ones that distilled water can be added too) have a slightly lower voltage readings. All this information and Load Testing, Charging system Testing and more can be found on page 22 in the Technical Manual.
 
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