Oppo made a live demonstration of its 125W
flash charge system. The phone used in the demo has a 4,000 mAh battery and the
new fast charger brought it up to from 0% to 41% in 5 minutes, a full charge
took 20 minutes. Compare that to the 65W SuperVOOC 2.0 from last year, which
would have needed 30 minutes to charge the same battery.
As you’ve probably noticed, the new system
isn’t twice as fast despite having twice the top power throughput. This is
because the charging speeds decrease as the battery fills up in order to
prevent heat accumulation and protect the battery.
Speaking of protection, Oppo has increased
the number of temperature sensors from 4 on SV2.0 to 10 for flash charge
phones. They ensure that the battery never exceeds 40°C. Also, the new power
bricks use 128-bit encryption to prevent hackers from flashing new firmware on
the charger, which could cause it to become unsafe.
The 125W charger puts out 20V at 6.25A,
which is converted to 10V 12.5A inside the phone via three charge pumps (which
boast 98% efficiency). The battery itself can charge at nearly double the
current of the previous generation – from 6.5A to 12.5A.
That’s a C-rate of 6, which suggests that
in theory the battery can be fully charged in 1/6th of an hour, just 10
minutes. In reality, it takes twice as long as the charge speed is reduced
towards the end. After the live demo of the new 125W system, Oppo announced
that the chargers have entered mass production. This means that the first
phones to support them will be unveiled soon as well.
