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Are my XS Power D3400 batteries done for?


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I have two XS Power D3400 batteries that I've been running for the past two years. Recently my alternator went out which caused them to drain completely and sit in my truck dead for over a month. They have drained on me in the past before too when I went out of town for 2 months.

I just took them out and charged them both up. Battery 1 was all the way down to 2.33v and Battery 2 was down to 4.91v. It took 3 days for each one to charge above 12.6, but now that I've disconnected the charger they are sitting way below 12.6v each after just 3 days.
Battery 1 is at 11.2v, and Battery 2 is at 12.3v. They have been sitting in my garage with nothing connected to them. No power draw at all.
I know they're supposed to stay at 12.6v or above. So does this mean they're done for since they won't maintain proper voltage?
One of them also has a bulge in the top of the case if that makes any difference. That's the one that's sitting at 12.3v on the right in the photos. Couldn't really capture it in the photo..
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This is the batt with the bulged top, hard to see in the photo though..
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Battery 1 charge notes
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Battery 2 charge notes
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This is the charger I've been using
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battery #1 serial number is worn off unfortunately
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Bulged battery #2 serial number
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They might be a little hurt. I would go ahead and run them but that's just me. The rate of sulphation goes up as the voltage goes down. Is your charger one of those desulphation / pulse types? I use one to help failing batteries and it will keep them going longer. Anytime a battery is sitting for more than a week it should be put on trickle to fight sulphation. Even when your new battery is sitting at the store, the clock is ticking. Anyone know how to read the date codes on these? If you buy from a store you can pick the newest ones.

Edited by ShadeTreeMechanic

91 C350 Centurion conversion ( Four Door One Ton Bronco)

250A Alternator (Second Alternator Coming Soon)

G65 AGM Up Front  / Two G31 AGM in Back

Pioneer 80PRS

CT Sounds AT125.2 / CT Sounds 6.5 Strato Pro component Front Stage

CT Sounds AT125.2 / Lanzar Pro 8" coax w/compression horn tweeter Rear Fill

FSD 5000D 1/2 ohm (SoundQubed 7k Coming Soon)

Two HDS315 Four Qubes Each 34hz (Two HDC3.118 and New Box Coming Soon)

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Maybe you could test it like a starting battery. Put it in the truck for a starting battery and measure voltage while cranking. It should not go below 9 volts for starting duty.

91 C350 Centurion conversion ( Four Door One Ton Bronco)

250A Alternator (Second Alternator Coming Soon)

G65 AGM Up Front  / Two G31 AGM in Back

Pioneer 80PRS

CT Sounds AT125.2 / CT Sounds 6.5 Strato Pro component Front Stage

CT Sounds AT125.2 / Lanzar Pro 8" coax w/compression horn tweeter Rear Fill

FSD 5000D 1/2 ohm (SoundQubed 7k Coming Soon)

Two HDS315 Four Qubes Each 34hz (Two HDC3.118 and New Box Coming Soon)

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Unfortunately I can't because my alternator isn't installed right now. Need to figure out if I need to buy new batteries or not before I take it to the shop to have my new alternator installed.

So how are you going to take it to the shop with no alt? Put it on a trailer?

91 C350 Centurion conversion ( Four Door One Ton Bronco)

250A Alternator (Second Alternator Coming Soon)

G65 AGM Up Front  / Two G31 AGM in Back

Pioneer 80PRS

CT Sounds AT125.2 / CT Sounds 6.5 Strato Pro component Front Stage

CT Sounds AT125.2 / Lanzar Pro 8" coax w/compression horn tweeter Rear Fill

FSD 5000D 1/2 ohm (SoundQubed 7k Coming Soon)

Two HDS315 Four Qubes Each 34hz (Two HDC3.118 and New Box Coming Soon)

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If they drop in 3 days they most likely won't hold a load.

It's worth investing in a charger with a desulphation option, it could bring these batteries back and give you another couple years.

Or they my be toast. It's nice to have a good charger anyway.

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Unfortunately I can't because my alternator isn't installed right now. Need to figure out if I need to buy new batteries or not before I take it to the shop to have my new alternator installed.

So how are you going to take it to the shop with no alt? Put it on a trailer?

I have AAA

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