LEISURE BATTS

[merl]

Both batteries should be same type / make/ capacity / age.

They only need to be the same chemistry so that they both get charged and trickled at the correct voltage, there's no scientific reasoning behind matching makers, capacities or ages.

 

[colinm]

If you want to know the quality of a battery check the waight , a light 100amp battery Won’t be as good as a heavy one

And the scam way to deceive, is fill the bottom of battery with concrete.

 

[trevskoda]

And the scam way to deceive, is fill the bottom of battery with concrete.

People do that here when going to the scrap metal depos, not me of course.

 

[molly 2]

Will my battery last longer if I fill it with concrete

 

[Geek]

Your all probably right ,although there are some well known makes .I made a note of the serial numbers and compared prices with halfords but as you say what if it fails and ive got to take it back even if it has a 2year warrantee.

Buying a well known make from Temu does get you the label. The question is whether the product under the label is the real thing.

 

[Geek]

Will my battery last longer if I fill it with concrete

Yes, but you won't get any power from it.

 

[trevskoda]

Will my battery last longer if I fill it with concrete

No concrete evidence to prove otherwise.

 

[merl]

And the scam way to deceive, is fill the bottom of battery with concrete.

They do that with washing machines too

 

[r4dent]

They only need to be the same chemistry so that they both get charged and trickled at the correct voltage, there's no scientific reasoning behind matching makers, capacities or ages.

You are entitled to your opinion, I'll stick to matching my batteries.

Others must decide for themselves.

 

[Sid]

Your all probably right ,although there are some well known makes .I made a note of the serial numbers and compared prices with halfords but as you say what if it fails and ive got to take it back even if it has a 2year warrantee.

I think the two year guarantee says it all. Established suppliers would offer min 3 - 10 years. Alpha are very good and offer forum discount.

 

[Sid]

You are entitled to your opinion, I'll stick to matching my batteries.

Others must decide for themselves.

Agree with your comment.....there is scientific justification for matching.....it's the internal resistance. A major effect is the level of sulphation or degradation. When in parallel the performance is governed by the weaker battery. The chemistry of the electrodes and manufacturing process also has an impact on the internal resistance.

 

[trevskoda]

Agree with your comment.....there is scientific justification for matching.....it's the internal resistance. A major effect is the level of sulphation or degradation. When in parallel the performance is governed by the weaker battery. The chemistry of the electrodes and manufacturing process also has an impact on the internal resistance.

A good post on a plate, or should that be 2 posts and many plates.

 

[merl]

You are entitled to your opinion, I'll stick to matching my batteries.

Others must decide for themselves.

Scientific fact isn't an opinion.

When in parallel the performance is governed by the weaker battery.

Nope, when in SERIES the performance will be determined by the weaker (higher resistance) battery BUT when they are in PARALELL (like the OP will be connecting them) the resistances of the two batteries will parallel to form a new resistance that is lower than either of the original batteries, that's simply Ohms Law.
The two batteries effectively combine to form a single new battery who's capacity will exactly equal the sum of the original two batteries, that's Kirchhoff's Current Law.
If the chemistry and cell number is the same then both batteries become 'flat' at the same voltage as each other and also become 'full' at the same voltage as each other.
Because they are connected in parallel they therefore become 'flat' and 'full' identically. It doesn't matter how old they are or who made them or what capacity they are. They both attain full capacity and full discharge simultaneously and therefore their relative capacities of both batteries are fully utilised.

 

[r4dent]

when they are in PARALELL (like the OP will be connecting them) the resistances of the two batteries will parallel to form a new resistance that is lower than either of the original batteries, that's simply Ohms Law.

This wonderful statement convinces me that your knowledge of Ohm's Law is as deep as your knowledge of the possessive apostrophe.

The resistance of two items connected is parallel is calculated by summing the reciprocals of individual resistances (1/R_total = 1/R1 + 1/R2 + ...) and Ohm's law is not involved.

and that is simply a scientific fact not an opinion.

 

[trevskoda]

At least we dont get charged for information on here.

 

[merl]

your knowledge of Ohm's Law is as deep as your knowledge of the possessive apostrophe.

What on earth is the possessive apostrophe got to do with batteries in parallel? You truly are the king of the red herring.

The resistance of two items connected is parallel is calculated by summing the reciprocals of individual resistances (1/R_total = 1/R1 + 1/R2 + ...) and Ohm's law is not involved.

WRONG.
You first need to sum the reciprocals of the individual resistances and then find the reciprocal of the total. And Ohms law is fundamental in that calculation and is therefore DEEPLY involved.
Google and ask if calculating resistances in parallel has anything to do with Ohms law and see what it says, you may learn something.
Here you go, BBC bite size. Ohms law and resistances in parallel. Come back when you've swatted up.
Resistors in parallel circuits - Revise: Ohm's Law - National 5 Physics Revision - BBC Bitesize https://share.google/VS5WfJE60vpufkfaL

 

[trevskoda]

Feck im going to have to charge my we brain to get through this lot.

 

[r4dent]

What on earth is has the possessive apostrophe got to do with batteries in parallel? You truly are the king of the red herring.

A little light humour to start the Year!
Sorry if that doesn't doesn't appeal to your sense of fun.

Pleased to note that your adherence has gone from zero to 33%.

The resistance of two items connected is parallel is calculated by summing the reciprocals of individual resistances (1/R_total = 1/R1 + 1/R2 + ...) a

WRONG.
You first need to sum the reciprocals of the individual resistances and then find the reciprocal of the total.

Which is exactly what “1/R_total = 1/R1 + 1/R2 + ...) “ does.

and Ohm's law is not involved.

And Ohms law is fundamental in that calculation and is therefore DEEPLY involved.

Ohm's law is the relationship between voltage, current & resistance.
The parallel resistance formula holds true whatever voltage is applied , Ohm’s Law is NOT involved

Summary
We agree on the way to calculate the resistance of two or more objects connected in parallel.
You express it in words “You first need to sum the reciprocals of the individual resistances and then find the reciprocal of the total. “.
I prefer a formula ““1/R_total = 1/R1 + 1/R2 + ...) “
Others probably are not interested.

We agree that two leisure batteries connected in parallel should be the same type.
I believe they should also be the same make/ capacity / age.
You disagree and state this to be scientific fact supported by [sic] Ohms law.

Conclusion
I think neither of us will convince the other to change their opinion,
Others are, no doubt, getting bored with our discussion and will make their own decision about what batteries to fit.

I respect your right to add further comments, but as far as I am concerned the matter is finished and we must agree to differ.

All the best for 2026.

 

[barryd]

2016?

 

[trevskoda]

2016?

Alzheimers setting in.