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My 1954 KH is 6 volt, and I have no problems.
I use a
YUASA 6N6-3B conventional battery, in a
battery box from Taylor Classic Cycles. This battery is a tight fit in the box. You can squish it in, but the walls of the box are thick, and a little work with a file will enlarge it enough to fit comfortably. I have not tried Battery Box Guy boxes.
V-Twin used to sell a replica "Made In Imported" H3 battery. Many people said that they would only last one season, and the price was pretty high. Maybe they still sell them. Maybe they've improved. I don't know.
The
YUASA 6N6-3B is a quality battery available on Amazon. I bought the one in my bike in 2015, but it sat on the shelf DRY for a few years. So it's only got about 5 years on it in 2023. I bought another one last year, and stuck it on the shelf DRY for future needs.
Amazon also sells an off-brand VOLTZ 6N6-3B for about half-price. I wouldn't take the chance. When you're stuck on the side of the road on a dark and stormy night, you'll wish you had forked over the extra $20 for a known-good top quality battery.
Gary mentioned AGM batteries in an earlier post. I don't have any source for them (Gary?) Years ago, the
Harley Hummer Club recommended using one or two
Power-Sonic PS-640F1 battery. These are sealed, but I'm not sure whether they are AGM or not. I have used two of them (in parallel) in my Henderson, so they do work well.
Regulators are a problem. The 1952-1954 K and KH used the Delco 1118307 smaller-sized regulator, which are very difficult to find used, and I'd say, impossible to find NOS. Same for the outwardly identical, and performance-identical, but slightly cheaper internal construction 1118283. In 1955, they switched to the 11183794 (superceded by 1118995), both of which are larger than the '307. The '995 can sometimes be found on eBay - I found a NOS one there a few years ago.
There's a repro regulator that has been available for a long time. I THINK it is
this one. I am have been running one of those since when I started using the YUASA battery, 'cause I just don't wanna put that NOS '995 into service quite yet. They're only NOS once!
So that's my experience. What's yours?