How to tell if your battery is dead: Difference between revisions
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The following is important information for the DIY rider. Quite often a seemingly impenetrable electrical problem can be traced to a battery that is no longer serviceable. This should be the first thing you look at. | The following is important information for the DIY rider. Quite often a seemingly impenetrable electrical problem can be traced to a battery that is no longer serviceable. This should be the first thing you look at. | ||
Sometimes a battery just dies. Not necessarily from neglect, age, or use. It just dies. This normally comes from sulfates building up along the bottom and shorting out a couple of the lead plates. It's difficult for many people to trouble-shoot because they'll just toss a voltmeter on the battery | Sometimes a battery just dies. Not necessarily from neglect, age, or use. It just dies. This normally comes from sulfates building up along the bottom and shorting out a couple of the lead plates. It's difficult for many people to trouble-shoot because they'll just toss a voltmeter on the battery, see that it shows 12v DC and right away say it's fine. The truth is, if the resting voltage (after sitting, not on a charger) is below 12.2, that battery needs to be replaced. Below 12v and it's dead, for all practical purposes. | ||
To confirm the death, do a little more investigating. Here's a bad battery (this one died WHILE the bike was running!). It's being tested with a [http://en.wikipedia.org/wiki/Multimeter multimeter] to find the [[How to read a multimeter|voltage drop]]. | |||
Fresh off the battery tender. 13v is good. | Fresh off the battery tender. 13v is good. | ||
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[[Image:IMG_3398.JPG|170px]] | [[Image:IMG_3398.JPG|170px]] | ||
...and starter thumbed. This is the "drop" part of the equation. You shouldn't see lower than<br> about 10v DC | ...and starter thumbed. This is the "drop" part of the equation. You shouldn't see lower than<br> about 10v DC. | ||
[[Image:IMG_3400.JPG|170px]] | [[Image:IMG_3400.JPG|170px]] | ||
6 volts isn't good. Time to head to [[What kind of battery should I use?|the battery store]]. | 6 volts isn't good. Time to head to [[What kind of battery should I use?|the battery store]]. | ||
Revision as of 11:04, 22 September 2007
The following is important information for the DIY rider. Quite often a seemingly impenetrable electrical problem can be traced to a battery that is no longer serviceable. This should be the first thing you look at.
Sometimes a battery just dies. Not necessarily from neglect, age, or use. It just dies. This normally comes from sulfates building up along the bottom and shorting out a couple of the lead plates. It's difficult for many people to trouble-shoot because they'll just toss a voltmeter on the battery, see that it shows 12v DC and right away say it's fine. The truth is, if the resting voltage (after sitting, not on a charger) is below 12.2, that battery needs to be replaced. Below 12v and it's dead, for all practical purposes.
To confirm the death, do a little more investigating. Here's a bad battery (this one died WHILE the bike was running!). It's being tested with a multimeter to find the voltage drop.
Fresh off the battery tender. 13v is good.
Ignition on. 12v. Only a slight drop.
...and starter thumbed. This is the "drop" part of the equation. You shouldn't see lower than
about 10v DC.
6 volts isn't good. Time to head to the battery store.
