Our take
ASUS P3B is a portable projector whose strongest documented feature is a built-in 45 Wh battery. ASUS lists native WXGA 1280 × 800 resolution, DLP/LED imaging, a short 0.8:1 projection ratio, and battery runtime up to three hours. The 800-lumen figure is not labeled ANSI in the saved source, so it remains separate from explicit ANSI ratings. The compact setup can help with a client presentation, shared diagrams, or a small-group image when mains access is inconvenient. It is still a small projector rather than a bright-room auditorium solution. Runtime, focus, brightness, and battery health should be checked on the exact unit, especially if the product is being resold.
Portable work or small-group viewing where battery convenience and WXGA detail matter more than bright-room performance.
It is not for a large bright room, native Full HD detail, wall-adjacent UST installation, a current streaming-app guarantee, or a long session without verifying the battery.
Pros & cons
What could work for you, and what to consider before buying.
What works in its favor
- ASUS specifies native WXGA 1280 × 800 and a portable DLP/LED design.
- The 45 Wh internal battery is rated for up to three hours of operation.
- An 0.8:1 throw helps create a useful image from a short portable placement distance.
What to weigh up
- ASUS's 800-lumen figure is not labeled ANSI in the cited specification.
- Maximum runtime depends on conditions and battery age; it is not guaranteed for every unit.
- Its low-output portable role is not a substitute for a fixed bright-room projector.
The key details
| Model covered | P3B |
|---|---|
| Image format | Native WXGA 1280 × 800 DLP |
| Rated light output | 800 lumens; measurement basis not stated as ANSI |
| Placement | 45 Wh battery; up to 3 hours; 0.8:1 throw |
Performance figures are manufacturer claims. Source checked October 5, 2026. Regional models and included accessories can differ.
What the features mean for you
Battery operation is the defining convenience
ASUS specifies a 45 Wh internal battery for the P3B and lists operation up to three hours. That enables a presentation or short viewing session where an outlet is not immediately available, a more meaningful portability distinction than a light case alone. “Up to” is a best-case product claim and should not be treated as guaranteed runtime for an old battery or every brightness setting. Check charge behavior and battery condition on a used unit, and bring the power adapter for longer meetings. The battery makes the projector easier to move around a work setting, but it does not remove the need to plan for screen position, sound, and ambient light.
WXGA supports slides, but output stays modest
The P3B uses native WXGA at 1280 × 800, which provides more working pixels than SVGA and fits widescreen presentation material. It remains below Full HD, so small text and detailed video are not its strongest job. ASUS lists 800 lumens, but the saved specifications do not label this as ANSI; the profile therefore preserves ANSI lumens as unknown. For a presentation, test the intended slide font size at the actual screen width and room lighting. A higher input resolution will not increase the native pixel count. Do not equate a portable form factor with the ability to project a large image clearly in a lit conference room.
Short placement helps travel setups
ASUS lists an 0.8:1 projection ratio, a short-distance optical arrangement that can be useful on a small table or desk. It is not the same as ultra-short-throw: the image still requires a measurable projector-to-screen distance. A compact tripod or stable surface can reduce setup time, but start with physical alignment and focus rather than a heavily corrected angle. Measure the screen width and distance before a presentation so the image does not overrun the available wall. The P3B can move between rooms, but the 0.8:1 figure alone says nothing about brightness or the quality of the surface. Keep clearance around the case for air flow.
Use an external source and verify the power plan
The P3B is documented as a projector with external connectivity rather than a guaranteed current streaming platform. A laptop or media source can supply presentations and video, and the input list in ASUS's guide should be checked against the device and cable you intend to use. The exact model is LED-based, which is separate from battery behavior: the internal battery is documented, but battery age and charging condition are unit-specific. The saved ASUS sources do not establish a streaming-app catalog, so do not assume that Wi-Fi or file features are the same as a certified TV platform. Confirm adapter, remote, cable set, and any carrying case in the exact offer.
Make the compromise fit the occasion
P3B can be a sensible travel choice when a portable battery projector solves a practical problem and WXGA detail is sufficient. It is less suitable as a primary home theater or permanent meeting-room projector if brightness, large-screen detail, or long runtime is critical. Check start-up, focus, color, speaker function if used, ports, fan, and battery charge on the actual unit. Ask for the model label and compare the included charger to the guide. This assessment uses ASUS's specification page and manual; it does not claim personal testing, buyer-review analysis, current inventory, or a live price. Think of the P3B as a flexible small-room tool whose battery is valuable only if the exact unit still holds a useful charge.
What else to compare
For a smaller pocket projector, 3M MP180 trades down to SVGA and 30 ANSI lumens while retaining a battery. For Full HD home viewing and more output documentation, compare BenQ MH680, which is a mains-powered lamp model.
Before you buy
Does ASUS P3B have a built-in battery?
Yes. ASUS specifies an internal 45 Wh battery and lists operation up to three hours, depending on conditions and unit health.
Is the P3B's 800-lumen output ANSI?
The cited ASUS page gives 800 lumens without labeling the figure ANSI, so this review does not treat it as an ANSI rating.
Is the 0.8:1 P3B lens ultra-short throw?
No. It is a short placement ratio but still requires measured projector-to-screen distance; the saved source does not classify it as UST.
Where can I check the current price?
Use the Amazon link for current offers. Check the exact model, seller, product condition, delivery, and return terms. This page does not display a live price or confirm stock.
Sources & review basis
We use the following manufacturer documentation for the product features above. Our suitability notes and buying advice are editorial judgments based on those features, not measured performance results.
- ASUS P3B exact-model specifications and user guide ↗ — checked October 5, 2026.
- ASUS P3B product specifications ↗ — checked October 5, 2026.
- ASUS P3B user guide ↗ — checked October 5, 2026.
The decision
ASUS P3B is a battery-first WXGA projector for portable small-room use; confirm battery health and brightness expectations on the exact unit.
Is it the right fit?
Check the exact model and today’s offers on Amazon.