Start Batterie / Akkumulator (6 V)

[Werner]

Good afternoon,


on my roadster it is advisable to renew the battery. The old akkumulator is only 4 years old, but has only a capacity of about 6 Ah, that is 8%.

In USA I think are more and more "dry accumulators" (nickel cadmium?) in use. Are offered. Is this advisable in terms of price and living relationship?

[Kurt in NJ]

I have been using the Optima 6v battery, last one lasted 16 years, i never use battery tender

[Jacksonlll]

Get a tractor battery and drive your car a lot.

[Sparky]

Hello,

I'm not sure what you mean by "dry" accumulator (battery). There are batteries that are "dry charged", meaning you have to add the acid electrolyte yourself but they work just like standard types.

Nickel cadmium types are not used for engine starting.

A popular option is the "absorption glass mat" (AGM) types which use a non-liquid electrolyte, and usually last longer than standard liquid-filled batteries. they are more expensive. Here is an example:

https://www.speedwaymotors.com/Optim...%20(Jan25_2019)

Edit: i see Kurt already suggested the Optima. Not sure if they are available worldwide.

[Werner]

Hello,

thank you for the answers. "Optima" batteries are also available in Germany. But only with a capacity of 6V / 50 Ah. I think that this is too little capacity for a long time. I compare this with my Citroen 11 cv, since the capacity must be have is 6 V / 120 Ah.

[Russ/40]

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Are you sure about the optima batteries? The one many of us car guys use has the capacity to crank at 1000amps, and are the one shown in Sparky's link above.

[Brad in Germany]

How about this OPTIMA battery (click on the photo for the specifications):



....or cut and past this URL in your browser: https://de.optimabatteries.com/de-de...etail/rt-s-21/

For the specifications in english, click here.

Brad in Maryland

[updraught]

Originally Posted by Sparky

Hello ...
https://www.speedwaymotors.com/Optim...%20(Jan25_2019)
...

From Speedway:

Note
...

3. Red top batteries should only be used for hot rod / street rod / O/E applications where the system has a fully functional voltage regulated charging system. Red top batteries should not be used for off road/circle track aftermarket performance applications. The warranty is voided when a red top battery is used with out a fully functional voltage regulated charging system.

[ryanheacox]

Does the stock Model A charging system meet that requirement? It is regulated but only in the loosest of terms.

[Badpuppy]

Replacing the cutout with a modern electronic regulator will extend the life of any battery. With the cutout, the 3rd brush setting will be correct perhaps 10% of the time, which causes undercharge and/or "boiling".

Optima makes several types of batteries - the 50AH one is sealed lead acid (SLA). Being sealed, it must be closely regulated, as gasification could result in loud report (like my digestive tract). Personally, I don't see the value in the extra cost over a standard battery, but that's your decision.

50AH is OK if you don't leave the car parked in the street at night for more than an hour or two - or you use led bulbs for park and tail.

[Werner]

That's all helpful informations for me, thanks!

Overall, I understand that basically an electronic regulator is the first requirement.
I do not know yet which type of controller my car has installed.

So far I was of the opinion that 50 Ah for the start process is too little capacity. Because then the battery arrives at its load limit and ages faster.