I run two 16's in my car. I picked up two S1000's from Powermaster. Saved weight over the TurboStart from last season. The customer support at Powermaster is second to none. The only thing these companies don't tell you when you pruchase a 16 volt battery is it must be charged until it goes into "float" mode, or it will not keep a charge. If you go with Powermaster, make sure you get their charger also, trust me, it does make a difference.