Only 50"-60"? That's no problem for the M6 on battery power, it is just about bright enough for 50"-60" screen with office lighting. I'm assuming that means you're presenting to small groups like 4 or 6 people with your own pop-up portable screen. If there's fluorescent lighting there's usually a power outlet anyway to boost the lumens and you'll be okay even at 75". Now, with the lights out, 50"-60" with your own tabletop screen is probably well more than bright enough, almost as bright as a flat panel TV. The ability to prop one up in any remote location, cafe, reserved room, etc, can possibly outweigh the power cord depending on what your use case is -- are you going to be presenting in remote locations with your tabletop screens with just a small circle of 6 or 8 people at a cafeteria-style table or other power-inconvenient locations?
I personally have the AAXA P300, which is dimmer than the M6 but actually is extremely bright by pico projector standards -- when plugged in, it is brighter than my old NEC XG135 CRT projector. More light output in 1 pound than a 100 pound CRT!
My experience is that the new multi-hundred-lumen battery powered projectors are adequate for impromptu presentations. They work excellently in cafe lighting (e.g. at the end of a reserved table) as well as slightly dimmed conference room (doesn't have to be full dark).
Be noted that the light output of most battery projectors (including P300 and the M6) is roughly halved on battery power.
Or ... One alternative is simply to be armed with both a cheap full powered 3000-4000 lumen light cannon projector (plug in) as well as the cheap 400 lumen Android projector like the AAXA P300 Neo Smart Android (not the Neo non-Smart), you can find the Neo Smart for approximately 300ish or thereabouts. Which leaves enough money to buy a cheap plug-in light cannon. Two projectors for the price of one AAXA M6! Use the corded for the bright lighting situations and use the cordless for those dimmer/untethered "field situations". Next, install the official Microsoft PowerPoint viewer from the Google Play Android store on the P300 Neo Smart, the 400 lumens Android battery powered projector, and you can playback any presentations without a laptop in a projector that's pocket size but powerful enough to display a 50-60 inch if you've got the ability to turn off the lights. It becomes a usable emergency backup projector when your corded projector fails too, since the P300 Neo Smart is only 1 pound yet 400 lumens is enough for 50-60" with the light switch turned off as long there aren't windows on a sunny day. Brightness of 50-60 inch is quite impressive when the lights are turned off.
I've got the P300 ancestor, I almost wish I had the "Neo Smart" edition with Android on the 1-pounder for all the yummy streaming apps off Google Play to my heart's content without needing a Fire TV Stick.
P.S. Beyond presentations, I highly recommend these 400 lumen battery Android+WiFi projectors for outdoor/campground Netflix streaming (i.e. streamed through your smartphone via WiFi Sharing).
Last edited by Mark Rejhon; 02-06-2019 at 11:23 PM.