Looking for an BMW 20 G/S (K-start) battery? Then you've come to the right place. We have been selling batteries for BMW 20 G/S (K-start) Motorcycles online since 2003 and will have the correct battery for your Motorcycle in stock, available for next day delivery. Use our BMW 20 G/S (K-start) battery guide below to find a suggested battery for your Motorcycle and compare it to the battery fitted to your 20 G/S (K-start). Need help? Simply contact us.