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Hey all ! Where I live (and probably everywhere now) the car batteries are all sealed up very tightly, it's very difficult to remove the cover to access the filling points without making a huge mess of the unit.

But I had a thought - is it feasible to fill all the cells with water, maybe even the right amount of water, through the breather port on the top/side part of the battery ? It stands to reason that the breather port will lead back to each cell.

If anyone has tried that then please advise. Otherwise I'll give it a go and post the (likely) amusing results ....

No no no!

They are sealed for life…if it needs water it’s dead as in Monty Python..

Buy a new battery

Thanks but how is that the case though ?

Either the water balance is off, pH too low, so the battery doesn't charge >> top up water and it will work again.

Or.. the plates are actually sulphated from long term use >> In which case, drain off, rinse all the plates and clean with dilute alkali, then refill with acid of the right concentration.

Most of the time I'm guessing it's going to be the first one, especially if I never topped it up before ....

I guess the question I have is ... is it OK to just fill with as much water as possible ? Because some videos show technicians doing that, but I was under the impression that too much water might cause problems.

You're asking for trouble if you go tw@tting about with a sealed battery and I doubt your insurance company would look favourably on the reason your car burned to the ground from a dodgy battery.

Try and rejuvenate it using a ctek and failing that put your hand in your pocket and buy a new battery you cheap bastid!

LOL I gots to assume you're trolling in max mode. it's practically impossible to burn your car to the ground , I smoked every day for 20 years , including in a v8 that smelled like petrol around the clock

dreaming-of-driving wrote: ↑Mon Apr 17, 2023 9:30 am Otherwise I'll give it a go and post the (likely) amusing results ....

Yeah, do that.
Chances are nothing will happen but could be interesting.

its fine if u guys wana criticise ideas , but the criticism needs to be based on scientific reasons

not just " buy a special thing " or " buy a new battery "

dreaming-of-driving wrote: ↑Mon Apr 17, 2023 11:15 am its fine if u guys wana criticise ideas , but the criticism needs to be based on scientific reasons

Must have missed that bit in the rules section.

ha, oks. its not a rule. anyone can be stupid if they like

dreaming-of-driving wrote: ↑Mon Apr 17, 2023 11:23 am ha, oks. its not a rule. anyone can be stupid if they like

and I would suggest you're the perfect candidate to verify that claim...
Go on, do it.

I may have done things in the past that appeared stupid , but I was simply gathering empirical evidence

AFAIK sealed batteries still have the filling ports; it's whether the plastics are welded together so well that getting in destroys everything in site.

IME a decent battery has a 10 year life span if kept charged so worrying about topping up is pointless. Eventually they die of plate sulphation (or distortion) and, at that point, it's a lot of faff to do anything about it so weigh it in and put the fiver towards a new one.

dreaming-of-driving wrote: ↑Mon Apr 17, 2023 11:37 am I may have done things in the past that appeared stupid , but I was simply gathering empirical evidence

I gonna use that one on the wife next time she accuses me of doing something stupid.
"You call it stupid, I call it gathering empirical evidence, dearest". Like it.

goodo .. it sounds sufficiently scientific that most gals will just roll with it