2006 Twin cam Streetbob stage 2 1690cc, battery has been getting sluggish lately despite being on the trickle, will fire up when fully charged but this seems to instantly flatten it and it won't start again until fully recharged so I'm beat if on a short run. checked bike charging system and all ok so guess Duff battery not holding charge. So what's the best aftermarket battery for a big twin, do not want to pay HD prices (£170-200) depending where you look.
