bikemaster high performance maintenance free battery btz7s for husqvarna te 250 2010-2011 factory activated bikemaster the bikemaster high-performance maintenance free battery offers you up to 30% more cranking amps than a conventional battery thanks to additional plates located inside the battery. the battery will never need refilling, but will require charging during prolonged storage after the battery has been activated. the battery comes with a one-year manufacturer's warranty.