However, as you start adding electrical accessories, such as a heated riding suits and grips (or cocktail blenders) you can overtax the charging system to the point where it can't keep the battery charged. A voltmeter will give you a clear and dead-accurate picture of exactly how much power you're using to run your accessories, so if you've got it all switched on and the voltmeter reads 14.0 volts, or close to it, you're good to go. If the reading drops to 12.0 volts, you might want to turn off the heated grips (at least until the Margaritas are done). Granted, a lot of guys run a lot of electrical accessories without monitoring them with a voltmeter, and do just fine. Unfortunately, just as many overload their charging systems and end up needing a jumpstart after the second coffee break.