Tech Spam thread - because 1/4" BSP gets 5 hand spans to the jiggawatt

[RUNAMUCK]

This was the video I saw.

He indeed uses a stick welder.

[tortron]

9 hours ago, SOHC said:

Ramming high amps into your battery will just make the plates fuck out faster

When charging normally

When the battery is already fucked then crank it till it boils

[h4nd]

On 16/03/2022 at 19:25, ajg193 said:

Doesn't logic dictate that if epsom salts actually made a shit battery really good then the factory would put it in?

From my reading, it depends on the failure mode.

If fails from over cycling (heavy discharge / recharge, the active material falls of the plates and shorts out plates (goes low impedance, depending on separator design). High current might clear the first wee shorts, and give more joy for a while.

If over-discharged, left flat, undercharged, can sulfate (goes high impedance?). Possible that's what the epsom salts does, is rearrange the ions after that's happened?

 

Of interest, I was going to measure between the plates, but couldn't get both probes in one holw.

I did however get a reading as soon as the probes were in the fluid (from cell to cell), 2V, 2V, 2V, 2V, 1.2V

So I know which end is faulty, just not which of those two cells, or which failure mode.

I may make up some skinny probes to get a better measure.

 

Oh, and Pulse charger:

[igor]

Should the one dodgy cell not give you the same low reading when paired with any other cell?

[ajg193]

A million dollars of equipment and skill to try and save a $120 battery. Sounds like oldschool

[h4nd]

Ackshually, have we made "Certified BARRY!" badges to be awarded?

[Bling]

We don't like to encourage such things.

 

 

 

 

Yours is in the mail

[Carsnz123]

8 hours ago, ajg193 said:

A million dollars of equipment and skill to try and save a $120 battery. Sounds like oldschool

Waste not, Want not M9

[h4nd]

CTEK gave it a go, didn't think it was sulphated, charged it, then thought it was toast.

Epsom salts next.

[RUNAMUCK]

https://recharge.net.nz/

[Nominal]

3 minutes ago, RUNAMUCK said:

https://recharge.net.nz/

I tried some of that on a sad case, didn't help.

[RUNAMUCK]

60% of the time, it works every time........

[ajg193]

Oil squeezed straight out the backside of a snake

[ajg193]

Their MSDS indicates it is just plain old fashioned phosphoric acid:

https://recharge.net.nz/wp-content/themes/recharge/pdf/msd.pdf

[rusty360]

21 hours ago, h4nd said:

CTEK gave it a go, didn't think it was sulphated, charged it, then thought it was toast.

Epsom salts next.

I had one like the that Mr ctek didn't like it the first time, sorted it on the next start up thou.

[h4nd]

1 hour ago, rusty360 said:

I had one like the that Mr ctek didn't like it the first time, sorted it on the next start up thou.

I'll give it another try, (after 1/2 tablespoon of Epsom salts).

But it's busy having a go at a motobatt AGM bike battery, which it seems to think is sulphated, so ... fingers crossed.

[datlow]

so google says brake dust cleaners are just "Thioglycolic acid"

is there a cheap way of purchasing it, google wasnt very helpful

[tortron]

Pacer 4L/$100 is cheaper than the lab stuff 

[kws]

Just noticed mitre10 has a 4l tin of crc brakleen on their site for $34, which doesn't seem like a bad deal. 

[Nominal]

57 minutes ago, kws said:

Just noticed mitre10 has a 4l tin of crc brakleen on their site for $34, which doesn't seem like a bad deal. 

If only it was available