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@SurixTM what I'd expect from them is pretty straightforward: admit the mistake, and update the specs on Amazon, etc.
Falsifying battery capacity can be a major reason for a (temporary) product ban. Regulations exist for a reason, namely so that companies can't just write whatever they want on the packaging. You can't sell a power bank that is 5000mAh as if it was 20000mAh (no matter how you twist the math). Thereby you also can't sell a projector that has an at best 9000mAh battery pack (at 3.6/4.2V as per it is customary to indicate) as a 17000mAh one.
I bought my Halo partly because it has a built-in battery. I expect the capacity to be as indicated on the packaging, not some random measurements that were done in a lab for "play time".
@Ari there's no confusion, I ran the numbers down already.
Your packaging, as well as the battery's packaging, claims 59.454Wh.
This is 17.000mAh at exactly 3.476V - which is not a standard voltage to measure capacity at, for batteries or power banks
At 3.6V (nominal voltage of Li-ion batteries) we get 16.500mAh, which is kinda close, but not close enough to be considered a marginal error.
At 4.2V, it's even less, 14155mAh
Then, the problem of battery cells. Again, the photos of the Halo interior clearly show it is a 3-cell pack, further confirmed by the voltage (~11Vnom), which is precisely 3x 3.6V (which is 10.8V, but we can take 11 if the cells in question have a slightly higher optimal maximum voltage).
So we are ought to believe that the combined capacity of the 3 cells is 17100mAh, which would put each cell at 5700mAh capacity - that is still over 50% higher than any actually verified 18650 cell on the market. Simply said, a 3.6V 5700mAh battery, in the shape shown on the interior photos, cannot exist.
And as I mentioned on Facebook, I did some measurements on the power usage of the Halo.
Brightness: Max
Image mode: Game
Power usage is ~52W with display on, ~14W display off
Brightness: Max
Image mode: Bright
Power usage is ~50W with display on, ~13W display off
Brightness: Power save
Image mode: Game
Power usage is ~18W with display on, ~14W display off
Brightness: Power save
Image mode: Bright
Power usage is ~16W with display on, ~12W display off
Brightness: Night
Image mode: Game
Power usage is ~40W with display on, ~14 display off
Brightness: Night
Image mode: Bright
Power usage is ~38W with display on, ~12W display off
Brightness: Office
Image mode: Game
Power usage is ~70W with display on, ~13W display off
Brightness: Office
Image mode: Bright
Power usage is ~70W with display on, ~13W display off
Brightness: Video
Image mode: Game
Power usage is ~57W with display on, 13W display off
Brightness: Video
Image mode: Bright
Power usage is ~55W with display on, ~13W display off
Brightness mode "Max" is my custom setup that sets every colour channel to 100% as well as the actual brightness.
Brightness mode "Night" is also a custom setup with 50% brightness, and colours tuned to be more realistic (R: 40% G: 40%, B: 50%)
I've taken multiple measurements in each mode, to make sure everything is correct and I didn't run into some sneaky drip charging of sorts.
I also tried video playback with max and half volume - the difference was almost negligible, 2-3W at most on max volume with local hardware decoding h.264 1080p stream from a local server.
Conclusion:
The board (with Android TV running, connected to WiF and the Bluetooth remote), depending on mode, eats around 12-15W
The projector assembly, depending on brightness, can eat up to 55W on its own (in Office mode). How Office mode can be more power hungry than my custom Max mode, I don't understand - maybe Ari has an explanation?
In power save mode, the projector assembly eats between 15-25W
When running from battery power, like most devices, the Halo most likely goes into a more power-saving mode (not display, but hardware!), such as lowering the fan speed, reducing the CPU frequency and not bumping it up to maximum unless needed, which would result in the board power usage going down to around 5-7W.
When running from battery power, the projector brightness is reduced, but not as much as the "Power save" mode. I'm guessing a ~20-30% reduction in brightness, which should lower power usage by as much as 50%, thereby giving an approx. power usage of 7W + 20W ~ 30W
Speaker volume (weirdly) does not affect power usage
This equals the rough estimate of 2 hours playback on battery power, as the battery would be almost 60Wh.
Generally, I think the current OS is badly optimised, and the projector assembly handling as well. The Anker Nebula Mars 2 Pro, for example, has a 48.642Wh battery (4 cell 18650 at 3350mAh capacity), and slightly worse brightness (500 ANSI lumen on battery vs. the 600 ANSI lumen of the Halo), and although it uses a different CPU (based on the specs, a Qualcomm Snapdragon 205), the board's power usage is negligible. So how can the Anker manage 3 hours out of that <50Wh battery, when our 60Wh one can barely push out 2 hours?
