I have a letter from EarthX replying to me on the suitability of the ETX36C battery for the 103CI Harley:

EarthX approves the above model battery for our 103 bikes.

I have had mine over a year now and NO problems so far, it cranks like a champ!
I ride often, usually 10-30 miles and have only taken 1 long (1,000+ mile) trip with the EarthX. I would disconnect the ground if the bike was going to sit for a few weeks since the factory alarm is a steady drain. Then this battery would have a longer shelf life than any lead acid. Or you could buy the special trickle charger.

IMHO the only reason to avoid this battery is the cost. I bit the bullet since I did not like the look of the "bubble" or "tall / fat" battery and 'puter covers and I wanted a flush hardtail look on my softail.

 

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Good job on this one with the peanut tank. I think the RSD Vintage one of the nicest tanks for softails (save the extra stops at the gas station)

Did you have to run a sportster fuel pump with the tank?

 

Great transformations to the fatboy, very versatile bike. Great platform to change to suit your needs and tastes.

 

EarthX are great batteries. I have an AntiGravity battery in my Breakout- same quality, same price point, different company. got it very cheap from a friend who reps for them. But I'd use either brand they are both top rated. kills me with how much they cost though, hopefully in time that will come down as they are more widely adopted.

Only time you might have cranking issues is in extreme cold temperatures. other than that, very reliable and powerful (and stupid small!). I use an Optimate lithium charger once in a while. Bike can sit for a couple months and fire right up no issues.

 

This is a good vid showing some of the differences between Lead Acid and Li Po.
HUGE difference in cold weather, you MUST know this:

 

Just looked up the price on the earthx battery and that's insane man!lol. DynaJ what other mods do you have planned?

 

Actually the bike has a carb so it was a simple as cutting the tank mounts and putting the tank on. The tank is know sitting in the painters showroom (he originally painted it)..Traded it for some paint work, but I have the tank mount in my garage.. lol

 

This are great batteries they just got them in a my local Harley..$$$$ ouch


I am going to re paint a set of tins I have in my garage I'm thinking blue and black with some silver flake in it. Most likely will run hard bags, looking at a 120r but I think I just complained about a expensive battery..lol

 

Ok got everything in the front still waiting on the stock rear fender, I kind of like this look though..but then again I just looked at the Dyna S, I need to stay out of the dealer! Lol

 

Man I was going to say this look is by far the coolest. I've always been a fan of this one.
Why not just tweek it of you got the mod bug to do something? Open belt? Engine mods? Such a sweet looking bike