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Message: <blockquote data-quote="asdf" data-source="post: 505802" data-attributes="member: 21924">What you have experienced is perfectly normal. Nominal (unloaded) voltage for your battery should be somewhere around 12.6-12.8V. The UPS will attempt to apply a float charge of somewhere between 13.4V and 13.8V at most times, and if it decides the battery needs charging, between 14.2V and 14.5V. Voltages above that may be used for equalizing cells, but I doubt it - at 15V you should be worried. It wouldn't hurt to install a cheapy voltmeter somewhere you can see. The larger concern is how happy your UPS will be when forced to recharge a battery which has been drained by more than 5Ah. Active cooling of the PWM circuitry would be a good thing. If it all turns out well, then yes, switching to a deep-cycle battery wouldn't be a bad idea. May I recommend the Exide Orbital Marine?</blockquote>