"Batteries that are built to die" sounds like a ludicrous and counterintuitive concept; but in fact, many consumer electronics manufacturers (OEMs) have built eventual obsolescence into their devices as a way to increase profits. Think of your smart phone. As you may already know, most phone batteries don't last more than one day per charge-given the demand for smaller, thinner, and lighter batteries in consumer electronic devices, and how the smart phone battery is expected to provide continuous, often high-discharge power for all of the phone's components. To maximize financial gain, most consumer electronics OEMs opt for more hardware updates and shorter product development lifecycles (PDLCs) of one year or less over longer PDLCs and devices that cannot be updated so quickly. This would be a disastrous move for medical device OEMs, however, as patients rely on the components in their portable and implant-able medical devices to keep them healthy and safe, i.e. not give out on them when it's time for an update.
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