The 101 Association, Inc.
For the preservation and enjoyment of 1928 to 1931 Indian Scout Motocycles
"You can't wear out an Indian Scout"

Battery for 1928 101

  • 19 May 2017 12:58 PM
    Message # 4842292

    Getting ready to fire up the '28 101 in a few days.  The battery case looks to be different than all of my other Indians.

    Any preferred 6v battery for this?  Brand and/or supplier?

  • 20 May 2017 1:53 AM
    Reply # 4843106 on 4842292

    It depends a bit on what type of generator and regulator you have. With the simple and stupid cut out on the 3 brush splitdorf generator it is the battery size (amp hours) that is a vital part of the charging system. And it has to be an old type wet lead battery. The internal construction of the generator determine that because the field coil is using the battery in symbiosis as a buffer, up to a limit. A smaller battery (and even orig. battery) it at a greater risk of boiling out. 

    Orig. battery is at (was it 19AH or 16?) However, that is probably of larger capacity of any of the modern batteries you find today on the market that will fit the battery box.

    Slightly better chance of preserving the battery is with the 2 brush Bosch generator and regulator that senses and regulates the current that goes to the field coil. It is possible and I recommend to modify the Splitdorf to a 2 brush system with a sensible regulator.

    Best chance to preserve a wet lead battery and even run with smaller capacity batteries, perhaps even sealed or gel batteries, is to use an electronic regulator that is a lot quicker and more sensible to the draw and what the battery can take in regard of charging current. There is a few on the market, both for the Splitdorf and Bosch. 

    A fair warning is entitled. Regardless if you use an old generator or decide to run some of the alternators that is small enough to fit on the Indian, a standard electronic regulator is not suitable for a modern fancy metal, ion hydrid or hybrid battery variants that is easy accessible on the market these days. Those kind of batteries needs a specially adapted for the type of battery, fast acting and exact electronic regulator. The batteries could be fire or exploding hazard when overcharged, as also gel batteries are in some cases. BUT I don't know if such specialized regulators are available on the market for those needs

    So, a wet lead battery is most common to use. Today's batteries is more delicate constructed with thinner plates and stuff inside so they are prone to vibrate to bits and short out internally, in the battery box. With a hard tail as the 101 is, the jolts and vibrations are tremendously violent on the pot hole riddled roads of our "modern days"! Use a tilers knee pad under the battery and loosely on its sides to isolate from vibrations. I even made a coil sprung pad under the battery in order to have a longer shock absorption range!! Still the crappy batteries of today doesn't last long...

    Last modified: 24 May 2017 8:19 AM | Carl-Erik Renquist
  • 20 May 2017 7:41 AM
    Reply # 4843343 on 4842292
    Tim Raindle (Administrator)

    Exactly what Carl-Erik said. Three brush generator set up effectively uses the battery as an extra regulator, ie the battery boiling off is almost an excess voltage control, thats why so many Indians have rotted out battery carriers and chainguards.  Sealed batteries can explode, I had one go the shape of a football on a customers bike two years ago out on a test ride on a hot day, so original genny = old fashioned lead acid battery.

    Gene Harper in the US was making a solid modern regulator for splitdorfs and autolites, Antonio Esteves in Europe had one too.

    Will try to find out if tye are still available.


  • 20 May 2017 8:29 AM
    Reply # 4843396 on 4842292

    I have Gene Harper's electronic regulator with a small cheap sealed (AGM) battery, which has lasted forever.  These batteries are much more rugged than a flooded battery because the plates are sandwiched tightly between glass mats.  They can't tolerate overcharge for long because the tiny amount of electrolyte will soon be lost.  I would not use an AGM battery without an electronic regulator.

  • 23 May 2017 6:37 PM
    Reply # 4848523 on 4842292

    Thanks Guys.  Looks like I need to provide more information.  I will do so as soon as I find out.


  • 18 May 2024 6:08 AM
    Reply # 13358517 on 4842292


    I have a 1929 101 with a DU5, and have read the posts regarding the issues of over charging of the DU7.

    I assume that the DU5`s have the same issues of over charging as the DU7?

    From Carl-Erik`s comments, would I be correct in assuming that it is the higher the AH of the battery, that acts as a buffer to prevent the battery from overcharging/frying?

    Are the Gene Harper Regulators still available?

    Will the Gene Harper Regulators fit in the DU5?

    The attached is a Lead acid battery that will fit in the battery box, however it`s only a 6AH, but Capacity notes 10 AH. Would this battery be suitable if modified to 2 brush setup?

    Any feedback, opinions or alternatives would be greatly appreciated.

    Thank you in advance.

    1 file
  • 19 May 2024 1:12 PM
    Reply # 13358798 on 4842292


    I have a few Splitdorf regulators still available, same for all DU models.  At this time I don't have any Autolite regulators.  I'm not planning to make any more new regulators at this time.

    Lots of info on my old website:     I also have one dry lead acid battery left, new.  I've long since moved away from the lead acid batteries and use the Shorai Lithium Iron battery:  As mentioned, you MUST use a well regulated system with these newer batteries, so no 3rd brush setups.  If you want to stick with the 3rd brush, a lead acid is the best, but it will require some attention.

    If you are interested in a regulator, please don't order from the website, email me here:

    Gene Harper


  • 19 May 2024 7:57 PM
    Reply # 13358898 on 4842292

    A very large selection of (AGM) batteries are offered by Power Sonic Corp in San Diego CA see website POWER-SONIC.COM, up to 210 Ah!.

    But only a few AGM's are 6 volt I see now.

    I have use their 6N 11A-1B conventional lead acid battery with a Bosch DVAR with original regulator.  Its old and I will be purchasing one of their AGM batteries (My DVAR has a been reconditioned by Antonio Esteves and has a new regulator). Only the PS-6100 FI seems suitable and is widely available in U.S. ( next day delivery from Amazon stock where I am.

    Years ago, on another 101, I was using their PS-6100 F1 AGM battery with originally regulated DU7 (2 brush). This now has a alternator disguised in a DU-7 case.

    Last modified: 20 May 2024 7:30 AM | Robert Lodge
  • 22 May 2024 5:44 AM
    Reply # 13360126 on 4842292

    Thanks Robert and Gene for the information and advise.

    Gene, I will read up on the web page and email you.


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