[Nut-upsdev] Tripplite Smart 2200 and Battery Voltage

[Brian Ristuccia]

For my Smart 2200, a charged battery string is anywhere between 25.6 and
26.8 volts. I'm seeing nut report 13.0 volts, which seems suspicious. Even
if the UPS were reporting half of the actual battery voltage to keep
protocol compatibility with models having a 12V battery system, the value
of exactly 13.0 seems unlikely. 

According to the page at http://kursknet.ru/~boa/ups/rtinfo_command.html,
the :B command returns "relative battery voltage", not any absolute voltage.