Yes, you could certainly do that, but it would not increase the amount of juice available to the stereo in any way.I think you could run a second battery with an isolator, that way the stereo is fed only from the spare and will not drain the main battery but the charging system will still charge it. If you draw too much only the spare battery will get dragged down. Isolators are often sold at RV stores like Camping world. It allows current only to go in one direction so current will flow in to charge but nothing flows to the main wireing system. The radio/amp must be wired directly to the second battery. A deep cycle battery may be a better choice as they take deep discharge better than stock batteries.
Good luck with it.
Randy
:roflblack:My stereo comes with its own battery. I put in ear speakers turn up sound and Ipod does the rest.:roflblack:
My wife has been running an 100w amp/radio/SD card slot/whatever else with speakers on her 08 RS with the original battery for over a year and has had no problems with it. Oh, except for the time she FORGOT TO TURN IT OFF!
Adding a battery, or replacing the original with a bigger battery (good luck with that), will not allow you to run a bigger amp...it will just make the battery run down a bit later. Every vehicle has a certain amount of amperage available for accessories, and all the batteries in the world can't change that. Since you can't put in a bigger alternator (magneto), you are stuck with the same capacity no matter what you do.
Very good analogy, Arthur. Thanks for finding the words to explain simply and elegantly.You have to see a battery as you would see a bank checking account. You can only take out as much as you put in. The trick is to have a larger capacity alternator with its larger voltage regulator and then a larger capacity storage battery. That means a bigger (in dimension) size battery. I can't imagine where you would put a bigger battery in a Spyder and I wonder if there is a larger output alternator with its voltage regulator for a Can Am 998 cc engine. I did all that to my Harley side car very successfully. But I had to use the left side case to hold the automotive battery.
i went with the oddesy for my main battery lamont talked about i have the jl audio package 400 watt system installed i used a opec battery isolator and im running a blue Kinetik HC600 Power Cell batter battery
and a Odyssey PC680 Battery for my main battery both have quick connet cords for fast charging i use the CTEK MULTI US 7002 12-Volt Universal Battery Charger w/ Pulse Maintenance and Backup Power and i have the indicators on there to let you know your battery status CTEK 56-380 Comfort Indicator Panel will keep you updated