Seems it's a fairly common problem with the Hinckley Triumphs.
My fella also had to get new battery for his Rocket III after 2 yrs.
The problem is that the aftermarket Datatool alarm drains the battery (happened over winter), & despite trickle charging on a regular basis we have had to jump start it a few times recently.
This means that U am losing confidence in taking the bike out (especially on my own), as there is a background anxiety of will it/won't it start.
It's a pretty poor show though that an expensive well maintained bike should require a new battery within this time.
We phoned up Triumph & they only guarantee a battery for 6 months! So take £8,500 of my Tactually fella's) money & fit a new bike with a battery unfit for purpose!

Can anyone recommend good battery for '09 1050 Speed Triple? Has to be sealed as it lies sideways + available in UK.