LEISURE BATTS

Some ebay sellers buy of temu and sell goods on ebay, i think ok to buy cheapish stuff which dont require a warrenty, same with ebay, outside led lights spring to mind.
 
Yuasa, Newmax, Exide, Ultramax, all with 2YR warantee all £20 cheaper on Temu. BUT it`s easier to take it back to the shop when it fails buying local. I`ve only had a couple of thing which i was disappointed with, i always keep a tape handy for when it gives the sizes. Me and the wife order regularly from Temu tools and meters,its ok . Every thing you buy now is made in China ,check your vacuum cleaner and kettle. And save money.
 
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There you are four in a row lolol
689c2d7a-bc40-4aa8-ab56-e39d26edfddb-1_all_3.jpg
 
Update re :-

The above DeWalt DCL 050-XJ type copy, one of the contractors bought 10 and sold them like hot cakes at £30 each in and amoungst his subby mates :)

He`s now ordered a load more and is having a look at what other DeWALT type copies they do now :unsure:
 
Sid said:
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.
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The point is what mismatched batteries with different internal resistance do.
The one with the lowest IR does the heavy lifting, provides more of the load.
If it is in parallel with a battery with double the IR, that one will give two thirds of the current.
After the load eases, they will balance each other.
Conversely, the low resistance battery will charge fastest but afterwards they will balance out.
This is not just theory. I have big AGM batteries wired in parallel with a 100Ah Lithium, and separate ammeters on them. I see this happening.
Ir works well for me, and has done for several years.
 
r4dent said:
This wonderful statement convinces me that your knowledge of Ohm's Law is as deep as your knowledge of the possessive apostrophe.
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Er, it appears that your comprehension is at fault here.
He didn't say how the combined impedance reduced, just that it is lower, which is precisely correct.
 
Geek said:
The point is what mismatched batteries with different internal resistance do.
The one with the lowest IR does the heavy lifting, provides more of the load.
If it is in parallel with a battery with double the IR, that one will give two thirds of the current.
After the load eases, they will balance each other.
Conversely, the low resistance battery will charge fastest but afterwards they will balance out.
This is not just theory. I have big AGM batteries wired in parallel with a 100Ah Lithium, and separate ammeters on them. I see this happening.
Ir works well for me, and has done for several years.
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Absolutely!
Battery impedance get's mentioned a lot WRT battery balancing, I've seen videos on YT that claim that it's the variation in internal resistance over the charge discharge cycle that forces the batteries to actually balance out which is false. The balancing process is simply a natural process/force and just like water levels and dissimilar temperatures want to equalise, the two batteries want to equalise in potential due two different concentration gradients within the chemical battery storage. Heat from a warm room ALWAYS flows toward an adjacent cooler room until they reach equilibrium, the same thing happens when two (or more) batteries are connected in parallel.....they want to reach equilibrium.
Another factor that's hardly ever mentioned WRT this subject is battery Sag and Swell. This is where the terminal voltage of a battery rises during charge and falls during discharge that has nothing to do with internal resistance whatsoever. It's called "Overpotential", not to be confused with overcharging. Overpotential is the additional voltage that needs to be applied to a cell in order to actually drive the chemical changes needed to make a cell charge, discharge overpotential is the opposite phenomenon and is what is often called 'Sag'. These overpotential states massively affect the battery terminal voltage and because current is driven by voltage difference, the overpotential differences between cells in parallel has a greater effect on charge/discharge and balancing current than mere internal resistance ever does.
Below is the internal resistance and overpotential data for 280AH LFP cells, (overpotential is present in ALL cell types not just lithium though.) It takes a bit of deciphering but the thick lower blue line marked I*R Ohmic is the voltage drop at the terminals caused by internal resistance alone. The wider multicoloured band above labelled I*R Ohmic plus overpotential voltage is just that, it's the total voltage drop of a cell caused by the internal resistance PLUS the overpotential voltage drop too, it can be seen that overpotential is considerably more significant than internal resistance by around 4-5 fold.


overpotential example merl.jpg
 
Seen 2 vehicles burnt out using these new batteries and fires could not be extinguished with these batteries. I would not trust them. Stick with the tried and tested lead acid in my opinion!
 
gabby82 said:
Seen 2 vehicles burnt out using these new batteries and fires could not be extinguished with these batteries. I would not trust them. Stick with the tried and tested lead acid in my opinion!
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There are MANY lithium battery chemistries, Please don't confuse Lithium Manganese Cobalt etc batteries that are used in vehicles, bikes and scooters etc with Lithium Iron Phosphate batteries that we use in our motorhomes. Lithium Iron phosphate batteries are extremely safe.
 
merl said:
This is where the terminal voltage of a battery rises during charge and falls during discharge
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The reason that this is a bit difficult to get our heads around this is that we tend to think of it as an electrical process. Electricity happens fast, right?

The reality is that batteries use chemistry and that takes time. The sag and swell is hard to understand as an electrical thing, but it's pretty self-evident when you consider it as a chemical process.
 
gabby82 said:
Seen 2 vehicles burnt out using these new batteries and fires could not be extinguished with these batteries. I would not trust them. Stick with the tried and tested lead acid in my opinion!
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No you haven't.
Lithium Iron Phosphate batteries aren't used in vehicles.
 
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