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  #16  
Old 10-28-2021, 10:28 PM
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Location: Ontario, Canada
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Originally Posted by BillGrissom View Post
The original Battery Brain is best and you can find on ebay occasionally. Later ones (grey?) were made in China and I had one fail. The Gold model is best since has a remote for easy turn-off, which doubles for security. I think they went out of business, partly because new cars don't like disconnecting the battery since loses all their presets.

Like many here, I use the H8 battery in my 300D's, instead of the correct "Frame 74" size, since H8 was $40 cheaper and 10 lb lighter for about the same CCA rating. I put a "Battery Mat" underneath to neutralize the slight spills which always occur (why most steel battery trays are rusted thru). I've bought batteries from Autozone the last 10 years and always get the Gold-top warranty since I've used that many times. Some people speak well of Walmart's brand (EverStart?), even though about the least expensive, but get the models with the longest warranty.
I wouldn't need the battery brain except perhaps on our newest car - an Outback that has a minimal battery and quite high drain when parked. At home I have it on trickle charger. Alternative is CAA/AAA who will come and give us a boost!

Our Canadian Tire Eliminator battery is a size 49(H8) with 850CCA. It had 3yr full replacement warranty and 9 years pro-rated. Original cost C$139, new version now C$289! It has recovered well! Hopefully provide a few more years of service. Our Walmart has closed it's auto shop. They still had some batteries on the shelf last time I was there, but no automotive service desk.

I have cleaned up and painted the battery trays on my cars a couple of times. I use a paint much like POR-15. On my 107, I closed off all the holes in the tray after refinishing. - I had a hole in the firewall below! Ideally battery would be in a plastic box like we use on boats.

Cheers and thanks for the input.

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85 300D,72 350SL, 98 E320, Outback 2.5
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  #17  
Old 10-28-2021, 11:09 PM
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Post BCI Group 49 / H8 Batteries

I've been getting good service out of the Wallymart batteries, some place I bought an AGM that has 900CCA .
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  #18  
Old 11-05-2021, 07:30 AM
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Location: Mount Holly, NC
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Quote:
Originally Posted by Graham View Post
That battery brain could be useful! These modern cars deplete the batteries quite quickly. I have trickle chargers on the less used cars.

Lot of discussions about which battery brands are better. But, as you say, they mostly come from the same sources! Some no doubt have higher specs than others.

So far my 0.89V battery has fully recovered. 300D starts right up every time. We will see how it performs in the winter.
Beware… if the battery went that low, it IS damaged. It likely starts fine now, but your reserve is gone. Try this…

Turn on your headlights for 5 minutes…

Then crank without using the glow plugs.

Then shut it off, and try to restart…

Winter is tough on these batteries, the glow system can deplete a damaged battery, leaving you stranded. Don’t take a chance. Get a new battery ASAP.
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  #19  
Old 11-05-2021, 11:22 PM
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Quote:
Originally Posted by vstech View Post
Beware… if the battery went that low, it IS damaged. It likely starts fine now, but your reserve is gone. Try this…

Winter is tough on these batteries, the glow system can deplete a damaged battery, leaving you stranded. Don’t take a chance. Get a new battery ASAP.
The battery is old and will have to be replaced sooner or later. However, at present it is not acting up at all. The engine is good with new starter and car starts immediately I turn the key.

I did go out and do a load test and it 'just' stayed in the green 'good' zone for the rated CCA despite it being not much above freezing out there. I put the battery on the smart charger after two load tests and it is charging at only 0.5A indicating almost fully charged.

Your post did alert me to keep an eye on it and to drive it a bit more. Being retired, it's not a regular daily driver We are kind of used to having weak batteries up here and I have my phone and a CAA card Always have jumper cables in trunk as back up!
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85 300D,72 350SL, 98 E320, Outback 2.5
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  #20  
Old 11-08-2021, 01:16 AM
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My electrical engineering friend retired from the aerospace industry says that every complete discharge takes 1 yr off battery life.
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  #21  
Old 11-08-2021, 10:49 AM
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Originally Posted by Junkman View Post
My electrical engineering friend retired from the aerospace industry says that every complete discharge takes 1 yr off battery life.
Could be about right. I am an engineer too and worked in the electro-chemical field. But not on lead-acid batteries!

In my past, I did a lot of offshore sailboat racing. Our boats, for weight reasons, had just one starting battery. Everything ran off that battery. Overnight, we would have running lights and multiple instruments on continually. By the time we finished a race, the battery would not start the engine. Some engines, we could start by hand cranking. Other times we had to sail (carefully) into our slip.

Same sailboat battery would normally be fully charged and left on boat over 6 months of Canadian winter. Batteries used that harsh way generally would last 5 or 6 years.

If the battery voltage was very low, marine smart chargers would sense the low voltage and not even start to charge. Hooking dead battery in parallel with a good battery while charging would usually get things going! Using an old fashioned charger that didn't know the difference sometimes also worked. Or, as I described earlier for dead battery on 300D, using a modern small smart trickle charger to get to point where larger starter will take over can work depending on the charger.

I am sure none of this is good for the battery and no doubt reduces it's life. The positive in my recent 300D experience was that only one small dome light was on, so discharge was slow. Apparently less likely to seriously damage battery than a quick higher discharge due to internal heat.

My battery is working fine at present and starts car easily after sitting overnight at around freezing temperatures as well as on subsequent starts. But, I will be keeping a close eye on it!

This article may be of interest (you don't really need their Battery Extra device) https://www.recovermybatteries.com/batterybasics1.html

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85 300D,72 350SL, 98 E320, Outback 2.5
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