High capacity replacement batteries for cell phones

[perdrix]

The batteries in our cell 'phones are getting tired.   I've seen "higher capacity" batteries on offer from brand names I don't recognise - for example up to as much as 3400mAh to fit my iPhone 6S whose original battery was 1715mAh.

However there are real mAh and then there are phony mAh, and sometimes a battery may meet its high mAh rating initially and then degrade much faster than you'd hope.

So to the questions:

• Are there any vendors of such "higher capacity" batteries whose mAh ratings are honest and that don't fade away in a few months?
• If there aren't any of the above are there any vendors of original specification cells that are OK?

Thanks
David

[aqibi2000]

The physical dimensions of the battery must change if the capacity is changed since they are made up of the same chemical energy density of lithium.


Therefore it is impossible for them to double the battery capacity and keep the same size == they are feeding you baby donkey poop.


Capacity increase does not exist

[perdrix]

Actually that's not quite correct - your proposition is correct IFF the cells all use identical technology.   Changes in anode and cathode construction, and to a lesser degree electrolyte formulation can make an immense difference in cell capacity.

Which is why (for example) 18650 size cells today can have genuine capacity well in excess of double what they had five or ten years ago.

David

[aqibi2000]

They will be the same capacity as original item clones but someone felt it needed a new capacity sticker.

Feel free to buy 10 samples of various ones and use RC LiPo charge/discharge balancer to verify.

[perdrix]

I fully understand that there a lot of label engineered cells out there that will actually have the same or lower capacity than the originals.  However for a given cell size it is quite possible for the same basic chemistry to have a range of capacities depending on the technology used to for the internals.

I asked here in the hope that someone who had actually done the appropriate tests on a range of "recognised" brand batteries would make a useful contribution.  You're saying that all Li-Ion cells of a given size will have the same capacity - that just isn't true.

David

[wraper]

They will be the same capacity as original item clones but someone felt it needed a new capacity sticker.

Most likely half of original capacity labelled as twice of original capacity. Unless battery is larger than original, all of those high capacity claims are complete BS and indication of very low quality fake.

[wraper]

• Are there any vendors of such "higher capacity" batteries whose mAh ratings are honest and that don't fade away in a few months?

If you talk about something made in last 10 years, there was no major breakthrough in battery technology to offer twice of capacity in same dimensions. Maybe 20-30% for top notch technology, but not twice.

[Haenk]

I'd also say - buy a brand that has been on the market for a while and states more or less the original capacity. That's probably a brand worth a certain amount of trust. There is no such a thing like "magical soubling of capacity".
Don't buy "original" batteries (unless buying directly from the manufacturer or an approved service center) - 99.99% of them are fake or used.

[perdrix]

Yes indeed 20% or so was pretty much the sort of improvement I would have expected.

Looks like I'll just try to work out who the "good vendors" are - any pointers welcome.  I can buy from Duracell, but a) they are expensive and b) I've had bad experiences with their quality

[aqibi2000]

Can you share a link to the Duracell iPhone battery please

Also there are apps which can deduce discharge mah.

[mzzj]

Actually that's not quite correct - your proposition is correct IFF the cells all use identical technology.   Changes in anode and cathode construction, and to a lesser degree electrolyte formulation can make an immense difference in cell capacity.

Which is why (for example) 18650 size cells today can have genuine capacity well in excess of double what they had five or ten years ago.

David

Unfortunately developement is lot slower. 18650 has progressed from 2011 (3000mAh) to today 3600mAh awfully slowly.
http://lygte-info.dk/info/Batteries18650-2011%20UK.html

It took over 20 years for 18650 li-ion to double from 1800 to 3600mAh