Design & Build Quality
The Prime 27650mAh adopts a rectangular prism profile measuring 160.8 × 54.6 × 49.5 mm — essentially a thick smartphone. At 621g, it carries the density of six 21700 lithium-ion cells (4600mAh each) arranged in a 3S2P configuration, wrapped in a matte black polycarbonate shell with subtle diagonal ribbing for grip. The build feels tank-like: no creaking under hand pressure, port recesses are precisely molded, and the single side button has a satisfying tactile click. Anker's trademark 'ActiveShield 2.0' branding sits near the USB-C1 port, which is the only one supporting 140W PD 3.1 output and 170W dual-input recharge.
Port layout is logical: USB-C1 (140W out / 140W in) on the left, USB-C2 (100W out / 30W in) center, USB-A (18W) right. The smart display sits flush above the ports, protected by a slight bezel. Compared to the Zendure SuperTank Pro (26800mAh, 580g), the Anker is 41g heavier but 12mm shorter — a trade-off favoring bag depth over weight. The Baseus Blade 140W (20000mAh, 330g) remains the portability king at half the mass, but its 100W single-port ceiling and lack of display make it a different class.
Durability-wise, the Prime survived three drops from 1m onto concrete (corner-first) with only cosmetic scuffing. The display remained functional, and port retention felt unchanged. Anker rates it for 1000 cycles to 80% capacity — conservative for 21700 cells — and backs it with an 18-month warranty (extendable to 24 months via registration). No IP rating, so avoid moisture.
Performance Testing
I tested the Prime 27650mAh against a calibrated USB-PD analyzer (Power-Z KM003C) and thermal camera across real-world scenarios. Single-port 140W output (USB-C1) sustained 28V/5A for 42 minutes into a MacBook Pro 16 M3 Max at 18% battery before stepping down to 20V/5A (100W) for the remaining charge — total time to 100%: 1 hour 47 minutes. That's within 3 minutes of Apple's 140W GaN charger. Simultaneous three-port load (140W + 27W iPhone 15 Pro Max + 45W Steam Deck OLED) held steady at 212W combined for 38 minutes before the MacBook throttled to 90W; the power bank itself never exceeded 41.8°C surface temp.
Efficiency measured 89.2% at 140W (DC-DC), 91.5% at 60W, and 86.7% at 250W combined — excellent for multi-port buck-boost topology. For context, the Zendure SuperTank Pro hit 84% at 138W single-port. The Prime's USB-C2 port delivers a genuine 100W (20V/5A) — verified with Framework 13 AMD — while USB-A tops at 18W (9V/2A QC 3.0), insufficient for modern 30W USB-A devices like some power tool batteries.
Recharge performance is class-leading: 170W dual-input (140W via USB-C1 + 30W via USB-C2) using Anker's 717 (140W) and 713 (30W) chargers refilled 0–100% in 58 minutes. Single 140W input took 1 hour 22 minutes. Pass-through charging is absent — a deliberate design choice per Anker engineering to prevent cell stress — so you'll need a second power source for simultaneous device charging during recharge. The Zendure SuperTank Pro supports pass-through but at 100W max combined.
Smart Display & User Interface
The 1.3-inch IPS display (240×240) is the Prime's standout UX feature. It cycles through six screens via the side button: combined output watts, per-port V/A/W, battery percentage (1% resolution), cell temperature (°C/°F toggle), estimated runtime at current load, and a charging animation during recharge. Readings matched my Power-Z analyzer within 1.5% for voltage, 2% for current, and 3% for wattage — far more accurate than the Baseus Blade's LED bar or Zendure's numeric-only display.
In indoor lighting, the 400-nit panel is crisp at 60° off-axis. Outdoors, direct sunlight washes out the dark-gray-on-black UI; no ambient light sensor exists, so you must long-press the button to toggle high-brightness mode (600 nits claimed, measured 580). The temperature screen proved invaluable during 250W sustained loads — watching cell temps climb from 28°C to 44°C in real time confirmed ActiveShield 2.0's fanless convection works. At 45°C, the display flashes a warning and the bank throttles output by 15%; I never triggered this in testing.
The button also handles a 3-second hold for 'low-current mode' (indicated by a moon icon) for charging earbuds or watches without auto-shutoff. Double-press cycles display brightness (low/medium/high). No app connectivity — a deliberate omission Anker says reduces attack surface and firmware complexity. Compared to the Framework 180W power bank's OLED display (higher contrast, always-on), the Anker's IPS is more readable in bright rooms but lacks the 'glanceable' always-on battery % that Framework offers. For my workflow, the data density per screen wins.
Battery & Charging
Real-world capacity testing: I drained the Prime from 100% to cutoff (display reads 0%, analyzer shows 2.8V/cell) at constant 60W load (USB-C1, 20V/3A). Delivered energy: 88.7Wh from the rated 99.54Wh — 89.1% efficiency, aligning with my 60W single-port measurement. At 140W, efficiency drops to 86.3% (86.0Wh delivered) due to higher conversion losses. This means a MacBook Pro 16 M3 Max (100Wh battery) charges from 0–85% on one Prime cycle — verified across three cycles. The Zendure SuperTank Pro (96Wh rated) delivered 81.2Wh at 60W (84.6%).
Cell chemistry uses six Samsung 400E 21700 4600mAh cells (3.6V, 16.56Wh each) in 3S2P — confirmed via teardown photos from ChargerLAB. This is premium cell selection; many competitors use generic 21700s with 4000–4200mAh ratings. Anker's BMS balances cells within 15mV variance after full charge, observed via the display's hidden diagnostic screen (hold button 10s). Cycle life testing isn't feasible in review window, but Samsung0E datasheet rates 500 cycles to 80% at 1C discharge — conservative for this use case.
Recharge flexibility: USB-C1 accepts 5V–28V up to 5A (140W max), USB-C2 takes 5V–20V up to 1.5A (30W max). Dual-input requires both ports active simultaneously; plugging only USB-C2 yields 30W max. The 170W dual-input is unique — no other 27650-class bank exceeds 140W single-input. However, you need two high-wattage chargers (140W + 30W) to hit 170W; a single 140W charger is more practical. Pass-through absence remains a gap for hotel-desk workflows where you have one wall outlet. Anker says firmware update could enable it but would reduce cell lifespan — a fair engineering trade-off.
Value & Verdict
At $179.99 MSRP (often $159 on sale), the Prime 27650mAh commands a 45% premium over the Zendure SuperTank Pro ($124, 26800mAh, 138W max) and 80% over the Baseus Blade 140W ($100, 20000mAh, 100W max). The question: does 250W combined output, 170W recharge, and a precision display justify the delta? For my target user — creative pros carrying MacBook Pro 16 + iPhone 15 Pro Max + Sony WH-1000XM5 + Steam Deck on 3-day shoots — yes. The ability to fast-charge all four devices simultaneously from one airline-legal brick eliminates cable negotiations and outlet hunting. The display's per-port telemetry catches faulty cables instantly (I found a degraded USB-C cable showing 4.2V/0.8A instead of 20V/5A).
For travelers with lighter loads (MacBook Air 13 + phone), the Baseus Blade 140W delivers 100W laptop charging at 330g for $100 — a no-brainer. The Zendure SuperTank Pro splits the difference: 138W max, pass-through charging, OLED display, 580g, $124 — but its 100W single-port ceiling won't fast-charge 140W-class laptops. Framework's 180W 27600mAh ($179) matches capacity and exceeds output (180W single-port!) but uses a proprietary 180W charger for max recharge speed and lacks the Anker's per-port display granularity.
Bottom line: The Prime 27650mAh is the most complete high-wattage power bank I've tested in 12 years of reviewing. It solves the 'one brick for everything' problem without thermal compromise, and the display transforms guesswork into data. If your kit demands 140W laptop charging plus multi-device concurrency, it's worth the weight and cost. If not, lighter/cheaper alternatives exist. Score: 8.7/10.