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Any suggestions where to find a 6 volt battery to fit my 1928 6 cyl? My Optima has gone into a deep discharge and will not come back to life. I need a replacement but Optima still says not in stock but 'comming soon'.
Have tried all the ways to get mine back to having a charge but no luck.

I believe 6-volt lead/acid car batteries are in plentiful supply. A 5-7 year service life could be expected.

I got my 6 volt Optimas from Advance Auto. They had to order it from their warehouse though. Took a day or two.

I just did a quick Google search and this is what came up. Hope it helps.

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Summit Racing has best prices, overnight shipping, for Optima Red Top 6-volt. (800) 230-3030. 800 cold cranking amps.
Weight is the enemy in any car. Got nearly a decade from my last Optima in my '47 Super (356-ci nine-main engine w/ gear reduction starter), know of a fellow who got 14 years in his '41 Cad, and of a Cad V-16 getting by just fine with an Optima. Some folks run two, which is ridiculous, unnecessary.

Packard didn't make batteries, so don't fathom the love affair some have for heavy, off-gassing traditional batteries, but if you're concerned and take your '28 Six to a battery show, Jim's Battery Manufacturing (800) 426-7580 can supply fakey do covers and no one will be the wiser, if judging and chasing points important to you.

Amazon also has good prices on Optima, but they are a vile organization, treat their employees like dirt:newyorker.com/tag/amazon

NAPA is still telling me they cannot get them. Optimas website says Coming Soon if you try to put one in your cart. If you purchased an Optima red top 6v in the last 2 months, please post a link.

If you still have the instructions for your battery it will advise to connect the battery to another fully charged battery and let sit. If the voltage comes back up charge normally. I used this method to salvage Optima batteries that were dead. I also would leave the two connected and charge as a package.

Optimas don't like fast rates of charging which is why the 6 volt generator systems do pretty well with them. The instructions state that standard battery chargers are not preferred.

We had to use Optimas in dyno cars to reduce explosion risk when redlining motors for hours and hours. The high charging rates killed a lot of them.

Dr. Cole gives his usual experienced advice. Absolutely. Optimas like a slow, steady charge; don't get them hot.

An Optima tech suggested a CTEK UC 800 6V
charger, which i got. It's been perfect for the past 24 or so years. Shows orange when charging, green when charged. You can leave it on 24/7 week after month with no concern about overcharging.

BTW, if you're not driving your car for months at a time, it's a good idea not to just to blip the ignition to keep corrosion from the connections to the starter, to jounce, rock the car up and down for the shock seals, but also, as an Optima tech suggests, turning on your head and/or driving lights for 25-30 minutes, running the battery down, then immediately charging it. In other words, occasional deep cycling is good for any battery, traditional wet or Optima spiral wound matrix.

But never allow any battery to sit depleted, which fosters sulfation, death knell for any battery.

However, if you're home, best to drive your car once in a blue moon, even if, like us in the greater Bay Area, you have to get up at 5am on a weekend to do it, such is our hellish,unrelenting traffic, the nation's worst after only LA.

If u dont want to parallel charge your Optima Get Ya this charger from HF

harborfreight.com/4-amp-fully-automatic- ... iner-63350.html?_br_psugg_q=battery+charger

Works great on 6 and 12 Optima

Just a week ago I got a 6-volt red top for my '48 from Advanced Auto. I ordered it on Monday afternoon, and they had it on the counter waiting for me by 11 the next morning. If that doesn't help you, check out your nearest tractor supply store. There are still a lot of old 6 volt tractors in service and I have had good luck getting 6 volt batteries from then as well as the thicker battery cables we need for the 6 volt cars. (I have not bought a Optima from them)