iPhone 5 battery life is significantly reduced by iOS 7
iPhone 5 battery life is significantly reduced by iOS 7
Apple’s iOS 7 debuted today to strong reviews and favorable reception.
The performance improvements are significant, even on older hardware, though
reviews indicate that the three year-old iPhone 4 struggles with the new
animations and transitions. But the odd thing here is that one phone — the
Verizon iPhone 5 — takes an absolute wallop in battery life. All of the phones
are negatively impacted by the iOS 6 to iOS 7 transition, but look what happens
to the iPhone 5 under WiFi compared to iOS 6 and iOS 7.
Original image courtesy of Ars Technica These tests were conducted as part of Ars Technica’s hugely
comprehensive review of the entireoperating system, and what they show
for the iPhone 5 is problematic for anyone looking to upgrade. We contacted
Andrew Cunningham, author of the Ars review, who confirmed that the Verizon phone was
tested twice, on both operating systems, with full factory resets in
between each test. The numbers came out identically in each case.
There’s some difference in how each website does phone testing
and it comes out in the various battery life figures. Anandtech
pegs the iPhone 5 at 8.9 hours of battery life for WiFi tests in iOS 7
— midway between Ars’ 11.01 hoursThe joy of corner casesCertain people have complained of poor battery life from iOS
7 since the OS went into beta, but no one appears to have built a database of
which devices were having the most problems. We know iOS 7 uses more battery
life in general — it’s possible that this problem is caused by specific test
characteristics and a bit of customized Verizon software.
Apple produces two versions of the iPhone 5 — the A1428 and the A1429. While
the underlying hardware is typically very nearly identical, carriers do install custom software on a device to identify it to
their own specific networks.
Alternately, it’s possible that a combination of webpage specific code, iOS 7
changes, or a WiFi bug have combined to keep part of the chip from dropping
into sleep mode. If the WiFi radio is sitting open constantly, or a CPU core is
spun up and looping rather than falling back to sleep after the page load, it
would explain why the chip is blowing through its battery life in dramatic
fashion. Unfortunately, it’s difficult to tell where the issue actually lies,
and whether or not the Ars results are an odd anomaly or an indication of what
Verizon iPhone 5 owners (or all iPhone 5 owners) can expect. Issues like
this, for the record, are why I personally don’t update my phone when Apple
releases a new operating system. I got burned with iOS 4 and the Apple 3G —
after the update, my phone was far slower, even when performing simple tasks
like launching applications immediately after a reboot. Even resets and full
installations didn’t help the problem. Each of Apple’s last few iOS launches
has had issues of varying degrees, so it’s not surprising that we might see
some problems here, as well. Rather than declaring one side “right” versus
wrong, I’d suggest a bit of practical caution. It’s obvious that in some cases,
iOS 7 is hitting iPhone 5 battery life hard. Whether that reflects a software
bug, corner case, or carrier oddity, it’s something that could make the upgrade
experience less fun for someone who grabs the newest version without checking
first. As always, your mileage may vary.
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