Not sure, but taking into account the latest move in the Macbooks, I would say they probably have it pretty much integrated into the design and didn't cater for

Not sure, but taking into account the latest move in the Macbooks, I would say they probably have it pretty much integrated into the design and didn't cater for that. Do others cater for that? From what I've seen, most don't and a good part of them have less battery life. I would assume switching batteries would make them bulkier and introduce more complexity to their hardware design. From their tech specs, 15 minutes in their battery case will give you 3 hours of usage (50% volume). This is if the battery is drained when you start charging them. I assume the more battery charge they have, the slower it is to charge them further. Would be interesting to know the predicted lifetime of both the phones/charging case's battery. Haven't found information on that and personally if, with daily usage, it's less than a handful of years, it would make me less likely to buy them. At the moment I have no plans to do so, will wait for the market response to that price point, since similar ones are mostly more expensive.