Well, if your Bluetooth keyboard did the work a cellphone does, that dollar store battery wouldn't last long at all.
Do you also assume that a $100,000 car should get three times the gas mileage as a $30,000 car? No, you'd probably understand that "it depends." It depends on whether the vehicles are designed for energy efficiency or high speed/acceleration. It depends on electric vs. gas vs. gas-electric hybrid. It depends on power-to-weight ratio, the cost and weight of body work and upholstery, passenger and cargo capacity, even the distance-between-fillup/charge capacity of the fuel tank/battery (and the resulting weight that must be moved)... Generally, people pay more for stuff because it has "more" - greater comfort, better fit-and-finish, sexy materials, speed, durability, perceived (and measured) quality, status/brand name, desirability, enthusiastic media reviews... And other people may find a more sensibly-priced product if they care less about some of those characteristics.
Nobody should buy a product (or choose a mate) expecting that it be something that it is not. Did Apple ever say, "Our batteries last more years than their batteries?" No? Then why should you expect it, considering how persuasive a selling point that would be, if Apple were to claim it?
Battery life is (primarily) not a function of "quality," it's a function of work load and chemistry. Different battery types have different characteristics. A lead-acid battery would last longer before degradation, but it's not practical to have an acid-filled wet-cell sloshing around in your pocket (even the sealed variety). A one-time-use carbon-zinc or alkaline has higher energy density (longer life) than a rechargeable NiCad, but the long-term costs are higher than rechargeables. NiCads have characteristics that lead to far poorer performance and useful life than rechargeable lithium ion batteries... Lithium ion batteries are the most expensive to make....
While it's possible to have poorly-made batteries of any sort, it's short-sighted for a company like Apple to buy cheap when your cost of warranty repair/replacement is high. "Poor quality" may lead to shorter lifespan, but it also leads to premature failure. While I doubt Apple buys gold-plated batteries (at least, I haven't seen any gold), they're not going to cut corners if it means they have to make good during the two-year term of an iPhone's AppleCare contract, or the three-year term of a MacBook Pro's AppleCare contract. And with many countries having consumer laws that extend manufacturer responsibility well beyond the one-year life of the manufacturer warranty... there's little or no incentive to use "crap batteries."
Yes. I do expect a Mercedes Benz cranks more millage than a cheap low quality US cars. I have had so many problems with GM car, I would never buy one again. Benz in facts gets lot more millage than US car.
There should a general expectations on how much years each product last. Your house builders never advertising how long your house will last, so you OK with your house classp before a year old?
If my cheap 300 dollars Android phone battery goes down before 2 year, I am OK with that. Not a thousand dollars iPhone. I have more expectations on iPhone. If Apple can't deliver a phone that is 3 times faster 300 dollar Android phone or if Apple can't deliver a phone last longer than 300 dollar Android phone, then Apple rips people off.
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If you have a source for these "quality" batteries, why aren't you a billionaire? What are you doing posting ignorant comments on a web site?
Apple used cheap Chinese battery. That is there source for low quality battery. They can otherwise use quality Sanyo or Japanese cell. But I guess than Apple will have lower margin. This is unacceptable for greedy Apple.