Two things tend to make or break a phone’s day-to-day feel: how good the screen looks and how long the battery survives your actual usage. Long web scrolls, back-to-back Reels, and hours of OTT streaming; a phone lives or dies on these fronts far more often than on any spec-sheet number.
POCO is positioning the X8 Power around exactly this: a 10,000mAh Silicon Carbon battery backed by 100W charging, and a 6.83-inch 1.5K AMOLED panel with 120Hz adaptive refresh rate and 3,840Hz PWM dimming rate.
We don’t take marketing copy at face value at 91mobiles TestLab, so we ran the POCO X8 Power against two closely priced rivals, the vivo T5 Pro and the Realme P4 Power, on our standard lab setup under matched conditions to see whether the numbers hold up.
Table of Contents
Test Methodology
Every device went through the same checks. On the display side, we skipped the spec sheet and went straight to a calibrated lux meter to measure actual indoor brightness and separately logged the PWM dimming frequency and minimum brightness output. On battery, our benchmark trio was PCMark’s Battery test, a straight one-hour YouTube playback run, and a 20-100% charging cycle, all with brightness, volume, and network settings locked identically across devices.
Display: What the Lux Meter Actually Shows
Look at the spec sheet alone, the POCO X8 Power seems to lose this round; its 3,500-nit peak brightness rating (at 25% APL, i.e., 25 percent of the entire screen can hit the peak brightness level, in comparison to just 1 percent of the display on competition devices) sits well below the vivo T5 Pro’s 5,000 nits and the Realme P4 Power’s 6,500 nits. But peak-brightness ratings are typically hit only in narrow, best-case conditions, they rarely tell you what you’ll actually see on the screen day to day. That’s exactly why our lab runs its own lux-meter check instead of relying on the box.
Here, the story flips.
Device | Display spec | Brightness measured on lux meter |
POCO X8 Power | 6.83-inch 1.5K AMOLED | 1,019 lux |
Realme P4 Power | 6.8-inch AMOLED | 713 lux |
vivo T5 Pro | 6.83-inch AMOLED | 394 lux |
The POCO X8 Power topped the group by a wide margin on measured brightness. It also tied the realme P4 Power for the highest PWM dimming rate on test, 3,840Hz, nearly double the vivo T5 Pro’s 2,160 Hz, a factor that typically means less visible flicker and reduced eye fatigue during long sessions, particularly at dim settings. Its rock-bottom minimum brightness of 0.04 nits (against 0.18 nits on the vivo T5 Pro) is another point in its favour for dark-room viewing.
Put together, strong measured brightness, high-frequency dimming, and a low display floor, the POCO X8 Power’s screen is built more around how it’s actually used than what its spec sheet claims.
Battery: Built to Outlast the Competition
Display quality only matters if the phone can stay powered through a real viewing session, and this is where the POCO X8 Power separates itself further.
Its 10,000mAh cell is essentially matched by the Realme P4 Power’s 10,001mAh but comfortably ahead of the vivo T5 Pro’s 9,020mAh. On PCMark’s Battery benchmark, a workload that mimics typical daily use, the POCO X8 Power ran for 24 hours straight, topping both rivals by a clear margin.
The pattern held in our real-world streaming check too: a one-hour YouTube session cost the POCO X8 Power just 3 percent battery, matching the realme P4 Power and edging out the vivo T5 Pro’s 4 percent drop.
Device | Battery | Charging test (20-100%) | PCMark Battery Test | 1-hour YouTube drain test |
POCO X8 Power | 10,000mAh | 78 mins | 24 hours | 3% |
Realme P4 Power | 10,001mAh | 80 mins | 21h 8 mins | 3% |
vivo T5 Pro | 9,020mAh | 55 mins | 18h 39 mins | 4% |
One caveat worth flagging: the POCO X8 Power’s 100W rating is the highest on paper, yet its measured 20-100% charge time of 78 minutes trailed the vivo T5 Pro’s 55 minutes. Rated wattage clearly isn’t the full charging-speed story here. That said, where it counts most for entertainment use, how long the battery actually lasts, and how efficiently it handles streaming, the POCO X8 Power is the clear frontrunner.
What earned it the TestLab certification?
A phone built for entertainment needs to nail two things: a screen worth watching for hours and a battery that doesn’t force you to hunt for an outlet halfway through. The POCO X8 Power delivers on both counts in our testing: the highest measured display brightness in the group, flicker-friendly PWM dimming, a 24-hour PCMark score, and the lowest streaming drain in our tests.
Taken together, this is the strongest display-and-battery combination we measured in this segment.
Bottom Line: POCO X8 Power Takes the Display & Battery Crown
Once you move past the spec sheet and into real-world lab numbers, the POCO X8 Power comes out ahead in the two things that matter most for everyday entertainment use: screen brightness in real-world conditions and battery life that goes the distance.
Between its lux-meter-topping display, flicker-reducing dimming, and its 24-hour PCMark score paired with best-in-test streaming efficiency, the POCO X8 Power earns its 91mobiles TestLab certification as the “Segment’s Best Display & Battery Experience.”
Disclaimer: Verified by 91mobiles TestLab based on comparative evaluation of display quality and battery performance under controlled lab conditions. The “Segment” refers to smartphones priced between ₹30,000 and ₹40,000 in India, as of September 4, 2026.
