1937 ULH Bobber battery??

[warkshop]

My old Bobber has been converted to 12 volt with one of the Cycle Electrics generators with the solid state regulator. All i seem to be able to source for a battery that will fit in the box is a tiny conventional lead acid or a horribly costly lithium.
While these do the job i'd love to upgrade to an AGM. Does anyone know of a company that makes a tall, AGM to fit this application?? I heard at one time someone made a tall (like the 6 volt) modern 12 volt for this. I ride this old girl a good bit, far and wide so a reliable battery is important. Help?!

[T. Cotten]

Warkshop!

If you have the Cycle Electrics's low voltage regulator, it is designed for a conventional battery in the hot environment of an oiltank.
The little 12N5.5a-3b batteries work well, and cheap enough to change every springtime.

They are a LOT cheaper than an armature, so over-extended use of any battery is a foolish bet.

.....Cotten

[Frankenstein]

As Cotten says, if you have the "low voltage" version, there are choices. Here is what I use on my machines, can be oriented in any position, and no acid spills. Usually last a couple of years at least.

http://www.allelectronics.com/make-a-store/item/gc-1270/12v-7.5ah-lead-acid-battery/1.html

DL

[Hollywood]

Here's what I do....

http://knucklebuster1939.blogspot.com/2014/11/panhead-project-el-cheapo-battery-trick.html

[Chris Haynes]

http://www.vtwinmfg.com/webapp/wcs/stores/servlet/VTwinProd5_10101_10102_3318184_-1_142247_142376_142381_142382

AND

http://www.vtwinmfg.com/webapp/wcs/stores/servlet/VTwinProd5_10101_10102_3313582_-1_142247_142376_142381_142383

[warkshop]

Thanks everyone! I have using the wee 12 volt (and changing yearly) with no issues. The bike already had the gen/reg in place when purchased so i have no idea if it is a low voltage or not. I'd like to hope that since the set up has been performing well that it is. I'll investigate that further to see if i can identify this. Frankenstein,,,thanks for the tip on what you use (the UPS) battery,,,,i may even see about using one for my big UPS!
I very much appreciate everyone's input, enjoy the riding season!

[duffeycycles]

If you have been using the small battery and not boiling it dry,it is probably the low output

[vph-d]

2nd that opinion on boiling the battery dry. I've boiling them dry for years... I'm trying some new AGM batteries this year.
VPH-D

[duffeycycles]

My brother extended his box lid screws and stacks 2 of the cheap batteries.2@ 5.5amps=11amps,,close enough to run high output without boiling dry

[larry]

12vagm.jpg
12 amps. Fits in oil tank.

[warkshop]

Again, thanks for the great input. I must say the 12 amp battery suggested by Larry looks like a peach! A UPS unit i'd guess.

[warkshop]

Larry! (and anyone else running these) i'm guessing you have run these Yuasa NP12-12FR batteries successfully,,,,looks like it would need to be mounted sitting on it's end. I know they are sealed but is the odd orientation a non issue. Think i'm going to go this route and am just trying to be sure. Looks like a great choice for the rigid frame HD, even made to resist high temps.

[larry]

I've been using these batteries for several years. I have five in use now. They work fine on end. The Yuasa is built better than the Chinese products, and I believe worth the extra $. I don't fully understand the pie are square of battery science, I only know that this battery has the proper amperage and fits well in the oil tank.

[warkshop]

Thanks Larry!!! You are 'the man'! I know what i'll do now, seems the best choice.