Many of my phones have had removable batteries, but I didn't have any trouble replacing the glued-in one on my wife's iPhone a few months ago. I think I have probably only bought batteries from Amazon or eBay, and I do select based on feedback. I can only repeat that I have never had significant problems. I think I had one camera battery that did not last particularly well. I had a phone once that started giving short battery life, but I was able to show that this was the phone, not the batteries, by swapping genuine and clone batteries back and forth between this and another phone of the same model.
My experience is that if a battery is called "genuine", you have to check very carefully to see that it is also described as "new"/"unused" (which it is probably not).
Same here. I think I get better odds of a good outcome by buying a random supplier's "matching" battery, than of getting an actual unused genuine one. Also, if the device is really old, it seems to me that any actual unused genuine battery may have suffered from aging.
I have interesting problems sometimes buying electronic accessories for a keen price.
A set of active 3D glasses for a Sony TV can cost a lot in a dealer (£100 a pair then), and is available discounted across both Amazon and eBay. On there some of the packaging, printing and pack photographs look suspect - never mind their claims that this a genuine or a genuine compatible with an original part, either will leave my head spinning.
So I deliberately wound up buying something cheaper that looked completely not a Sony product, yet had some positive views from previous purchasers. It was fine for the two 3D bluerays I own.
Sellers will show a genuine battery in their adverts or listings but what you get is slightly different - but it will have the brand name and a hologram sticker etc. The supplied battery is just fake.
The ones to really avoid are those claiming to be double the capacity, but in the same physical package.
Other company vouchers in with you order are popular marketing.
Being a cynic I once checked one of these £xx off a case of wine vouchers. The voucher leads you to a dedicated web page with the price of the wine with and without the voucher. However going to the web site parent page and then into the box of wine section there was the same product much cheaper. The "full" price quoted in the voucher page was that for a single bottle x12 and not for the normal discounted case price.
The problem is what defines whether a battery is "genuine"?
Phone manufacturers source their batteries from various third-party suppliers. Each of those suppliers probably sell their batteries via different channels to any number of other customers.
So is a battery still "genuine" if it came from the same factory, but didn't have a particular label on it?
That wasn't really my point, but a phone manufacturer might e.g. specify stringent quality control checks on batteries it sources. This still leaves the factory able to sells good-but-not-good-enough batteries off as "compatible"; so a battery from the same factory might (or might not) be the same in all respects as a "genuine" one.
My point about "genuine" as a sales-tag was that it seems often to be used mainly to distract a buyer from the fact (or possibility) that whilst the battery might be genuine, it was also used/ second-hand/ failed, or otherwise not what the buyer is *actually* looking for.
I think the 'made in the same factory as Kelloggs' argument is overdone. Most top-tier brands (Apple, Samsung, etc) have agreements with major contract manufacturers (Foxconn, etc). Foxconn have enough of a reputation to protect that they won't build knockoff iPhones on the late shift and let them into the market.
For lower level components it's possible the same part is branded multiple ways (like different cars can share the same part), but I imagine the volume of Apple, Samsung, etc is such they buy all the production of factory X with no scope for running a late shift. Plus if Apple found out the contract would be terminated very fast. Most of the parts you might replace (screen, case, battery, etc) are bespoke so there's no sharing between different brands than there might be for oil filters or wheel bearings, where you might buy a Skoda part cheaper than an Audi part.
So when we're looking at aftermarket parts I think it's fair to assume we're looking at those from secondary suppliers. The QC is only as good as the effort they put in and the supply chain that got it to you.
This is separate from the increased risks of fakes in 'genuine' parts, as against aftermarket brands which aren't worth faking.
It's *possible* but if you think about it that's quite difficult to do. In reality having a single production line producing just one type of battery would probably make that battery cheaper than both types being made on two separate production lines.
It doesn't really matter whether a different physical production line is used for each product or they share the same line but different materials are used. In the end, a single factory can produce one battery at one price and another battery at another price.
A factory's purpose is not to product the highest quality fault-free items possible. It's purpose is to make a profit at any level of quality and that might mean providing the market with offerings at two different price points.
Worse, they can have - say a 15% failure rate of batteries that are sub standard.
These get sold off cheap and rebadged and sold by cowboy traders. Sir Clive Sinclair stated out like that selling reject Newmarket semiconductor transistors to hobbyists.
Sure.
And making a turn on what would otherwise turn up in the scrap bin
Well its turned up, packed in a plastic thing that can be hung on a shop display. Looks fine and seemingly well made and is slightly curved which would have been a PITA to have matched with replacement cells.
This lot supplied, seems they have 880 pages of mobile batteries and a lot of other applications!..
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