Originally Posted by _cy_
IMHO LFX18 is way too small for your KTM 990, especially for adventure travel. the only LiFePO4 batteries I can recommend for an adventure bike are Earth-X ETX36 and Shorai LFX36. both have excellent cranking power with ample amp hour reserves.
The 18 works fine in the KTM. I just got mine, but it immediately started the bike from cold at 27 degrees F. Oh, and I have carbs on my bike, like every other carbed bike I have ever had, starts just as quickly as my FI bikes. 20 or 30 second crank times to start? That's silly.
For reference, I had a 8 cell, yes an 8 cell, TurnTech in my 950 for two years and it worked without issue too, except for sluggish cold starts until it self heated.
The big KTM's don't really have big electrical capabilities anyway. We are happy maybe with a set of heated grips and some auxillary LEDs. The Ah of the 18 Earth-X can easily handle that. I wouldn't hesitate to take mine anywhere off the beaten path. Heck I did that with my 8 cell TurnTech.