Looking for an BMW R 51 - 51/2 - 51/3 battery? Then you've come to the right place. We have been selling batteries for BMW R 51 - 51/2 - 51/3 online since 2003 and will have the correct battery for your Motorcycle in stock, available for next day delivery. Use our BMW R 51 - 51/2 - 51/3 battery guide below to find a suggested battery for your Motorcycle and compare it to the battery fitted to your R 51 - 51/2 - 51/3. Need help? Simply contact us.