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Correction: iPhone XS and XS Max Smart Battery Cases Have Larger Capacity Than Previous Versions
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Nice to see and I stand very happily corrected. Have to retract my prior outraged comments. Good job Apple - they'll sell tons of these - and the Qi charging is a nice touch. Will be getting one for my already very long battery life'd Xr.
Is it really that hard to give the general public a very simple statistic?
Most people don’t care about voltage, amperage, and mAh...
Tim Cook: Hello! We have new battery cases for the XR/XS/XS Max. They provide X% more charge for this device!
How hard is that?
Most people don’t care about voltage, amperage, and mAh...
Tim Cook: Hello! We have new battery cases for the XR/XS/XS Max. They provide X% more charge for this device!
How hard is that?
Why would the public care about that? Apple gave clear guidance about how long you can expect to get with the pack on for various activities. That’s much more useful information.
I’m really not sure how they (Apple or anyone else) are getting those Wh specs.
Wh = mah * output v / 1000
So
iPhone 6/6s SBC - 1877mah * 5v / 1000 = 9.3wh
iPhone 7 SBC - 2365mah * 5v / 1000 = 11.8wh
iPhone XS/XSM SBC - 1369mah * 8.7v / 1000 = 11.9wh.
How are they calculating the Wh to get a lower no.?
Wh = mah * output v / 1000
So
iPhone 6/6s SBC - 1877mah * 5v / 1000 = 9.3wh
iPhone 7 SBC - 2365mah * 5v / 1000 = 11.8wh
iPhone XS/XSM SBC - 1369mah * 8.7v / 1000 = 11.9wh.
How are they calculating the Wh to get a lower no.?
It’s amazing how somebody who says good things about Apple is useless to you. It’s almost like you have an agenda.
I have never understood using amp-hours over watt-hours for battery measurements in any remotely modern situation. An amp-hour measurement is fundamentally less informative under virtually any real-world circumstance when comparing modern batteries, and can range from deceptive to utterly useless if you don't know what the voltage is.
Of note, for any products on which Apple reports battery capacity (iPads, Macs) they report watt-hours, so one can directly compare the battery capacity of, say, a MacBook Pro and an iPad Pro.
The sole exception is if you have something with a constant current--rather than power--draw, regardless of voltage, but such loads are rare at best.
Of note, for any products on which Apple reports battery capacity (iPads, Macs) they report watt-hours, so one can directly compare the battery capacity of, say, a MacBook Pro and an iPad Pro.
The sole exception is if you have something with a constant current--rather than power--draw, regardless of voltage, but such loads are rare at best.
You are using the wrong version output voltages. Most smartphone li-ion batteries have 3.8 to 3.85 output voltages. If you want to be sure, just look at an iFixit picture of an iPhone battery, the volts x amps = Watt, or WHr equivalent is printed right on the battery by regulations.
In the case of the Wirecutter person, it was particularly egregious as you can see the 10.1 WHr right on the case in the picture he posted on Twitter.
The smartcase does not show what output amps it can deliver though. Basic math with 10.1 WHr means it can deliver 1.37A with 7.4V or some lower amperage at 8.7V to expend 10.1 WHr of energy. Both the amps and volts can likely float for this case, where it can be used to power the phone and charge the internal battery, and it is going to be complicated.
The output voltage is written on the inside of the SBC.
Hence the voltages I used. I did wonder the disparity between what is written on the case vs what was shown in the iFixit tear down.
Seems to me the SBC only lists the input and output power (8.7V =~ 0.7A), not the amps and voltages for the battery itself, and the lettering only shows the mAHr or energy capacity of the battery inside in WHr (10.1 WHr). A tear down will be required to see what the batteries in them are rated at.
Lithium-ion batteries typically are 3.8 or 3.85 V. If the new SBC has 2 li-ion cells inside, looks like they would have to wire them in series with 4.35 V to hit 8.7 V, but 4.3V basically the limit for a single cell li-ion battery, and why would they do that? Or why even have two cells, and not use the gazillion batteries they have for iPhones in the first place. Will be interesting to see the tear down.
Mine had 1% when picked up today. These were imported after a very slow boat ride from China?