From Antigravities Website under FAQ's
http://antigravitybatteries.com/faq/Things to be aware of:
If you are using the smallest battery possible for your bike to save weight (for example for race use a 4 cell in a 600cc bike, or an 8-cell in a 1000cc bike) you may find in 50 degree weather and below it may be sluggish initially. But with each attempt to start the battery actually warms itself from the amp discharge and gets back its full strength. If you often ride in weather below the 50s we recommend going up one or two sizes on the battery, this will give you more cranking amps to get power even if its very cold.
You can ruin the battery if you let it drain to below 10.5 volts!!! This is true of ANY battery, lead/acid or lithium. Draining a battery to this level will damage the battery cells. This is not a concern if you remember to turn off your ignition, or turn off any accessories that are not ignition switched and monitor your battery is you plan on not riding frequently. You should also make sure your vehicle does not have an “parasitic drain” or “short circuit”. A “parasitic drain” is something like an accessory that is pulling energy from the battery even though the ignition is “off” this can drain your battery below 10.5V and ruin it if you store the bike or don’t ride it to keep it charged … Sometimes a short can also be the cause of a drain on the battery though all accessories are “off”. For the best battery life you should monitor your battery and if you do not ride for a time make sure you disconnect the battery or put it on a lithium maintenance charger.
Also important is that OVER-CHARGING above 14.8V can damage Lead or Lithium batteries. For this reason older bikes should make sure their electrical system and specifically the Voltage Regulator is operating correctly or you will find yourself damaging your batteries if your bikes charging systems voltage to the battery is going above 15V.
DO NOT ABUSE the battery… These batteries express extremely high amperage and can get over-heated if you keep cranking a bike repeatedly over 7 seconds multiple times in a row. Though they are made to start your bike with fantastic results they can become over heated if you keep trying to crank a bike that just isn’t starting.