Recent comments in /f/iphone

stpfun t1_jdwwug5 wrote

That's rad! I'm sure it can use that full 65W when the battery is low. Though I'm pretty sure it can't use the full 65W of charging power the entire time it's charging. LiPo battery chemistry just doesn't allow it.

It's also easy to show this with math. According to the internet the OnePlus 8t has a 17.02 watt-hour battery. As in it stores enough energy to output 17.02 watts for 1 hour. (though it probably can't discharge that fast in practice). If a 17Wh battery charged at 65W the whole time it would take 17Wh / 65W = 15.69 minutes to charge! But because it takes 35 minutes, we know it must charge at 17 Wh / 35 minutes = 29.14 watts on average. Which is still craazzy fast. The latest iPhones, which can charge at 20W peak, but have an average more in the range of 12W.

I got into this stuff just by playing around with a USB-C power meter like this one. With that plugged into my charging cable I can finally actually see how many watts my devices are pulling at any given moment.

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nitroben2 t1_jdwusen wrote

That is good to know! It can be hard to find the official Voltage on electronics batteries.

That the Apple pack uses double the voltage explains why its performance Is so close to the 5,000mAh options from others even though it’s posted capacity is under 2,000mAh.

I wish all battery products would use Watt-Hours for capacity measurements instead of Amp-Hours with varying degrees of obfuscation on the voltage.

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jway5929 t1_jdwu6k9 wrote

Agreed. I have many battery banks of many sizes - some with wireless (but not MagSafe) chargers built in. I have found if I need to charge my phone via a battery bank, it’s because I need to use the phone. The Anker 621 is small enough that I always have it with me, but also keeps the phone very usable while charging. It easily charges my 13 pro over 80% which is plenty to hold me over till I get to a wired charger in my car or at home. In the heat, it does slow the rate of charging but it’s so small on the back of the phone, there is no rush.

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jway5929 t1_jdwsqmn wrote

Just an FYI, the nominal voltage of most battery banks is 3.7v. The circuitry bumps it up to 5v (or higher) to charge the phone. However the 3.7v should be used when calculating the overall capacity. So 37wh for a 10ah (10,000mah). So a 3.7v nominal battery pack with a mah rating under 27,000 can be taken on aircraft. Which make sense why manufacturers top out near that rating.

One exception is the apple MagSafe battery pack. That uses a 7.4v nominal voltage. This is why despite the lower mah rating it still has similar overall capacity to the Anker options.

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BIN3RY t1_jdwsooc wrote

I'm looking to upgrade my phone next month. I've currently got an iPhone 12 Pro 256gb. I've had the s models and X/Pro models but never had a Pro Max model.

I'm wondering if it's worth the jump instead of getting a 14 Pro but get the 14 Pro Max?

Is the size too much or have other users found it a better user experience in hand?

Any opinions would be great! Thanks

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wanjuggler t1_jdwphk9 wrote

Apple opened up its MagSafe tech to the new Qi2 Magnetic Power Profile standard, which "will also support new types of accessories that magnetically attach to the back of the phone, like an extra battery."

Presumably that support would include the signaling for the charger to tell the device that it is an external battery. So there's a path forward.

https://www.wirelesspowerconsortium.com/qi/#qi2

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jocamero t1_jdwlhw9 wrote

Yes. No case. I've used Apple's MagSafe wallet for a couple years now and only carry driver's license, primary CC, and debit card around. I use the software based Apple Wallet for nearly everything and the physical cards are just a backup. I have photos taken of the other crap I would keep in a traditional wallet, like an insurance card. I've never lost the MagSafe wallet and if you were to leave it behind while detached, you can setup a Find My alert.

I hesitate to say this, but it was (slightly) life changing (in a great way) to no longer be forced to carry around a larger physical wallet in my other pocket.

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