Yesterday I tested up-time by turning off WiFi, setting to 4G, and leaving the phone on the table all day. It took 7 hours to drain from 100% to 20%, with just an occasional peek to check the charge status, doing nothing else.
But I think at one point, it lost the network and was maybe scanning for it for a couple of hours, which could have affected the power usage.
Would you mind to repeat your test? Scanning for network for a couple of hours means your test result is useless. Every phones battery would be drained down in few hours in such a case. But I also trust more in your words about L5 than random people on YT.
I could repeat it, but I suspect the same will happen again; it seems to be a common occurrence.
Can the scanning for networks be disabled while you test?
Iām using it as Daily Driver, I can guarantee that it doesnāt last more than 9 hours, no matter how light is the usage. In fact a positive note about L5 is that the usage (in terms of phone calls) doesnāt affect dramatically the up time (much less than my old Android, that took advantage of the suspend functionality).
The only thing I could do is turn off mobile entirely. Iāve already done a similar test with everything disabled, which resulted in 14 hours.
And in fact, Iām only assuming the phone scans for the network after itās lost. It could be doing nothing at all, for all I know.
Yes.
So you need to use them. Cycle them through. (Each battery has a unique serial number so you have the option of various levels of rigour regarding battery health and maintenance.)
If you are going to use a second battery in order to double your time on battery each day then that wonāt be a problem.
Thatās putting a positive spin on it. 
That is hopefully a temporary situation.
Are you saying that the mobile network is unreliable where you are?
I think it is even more complicated than that. You are assuming that the state of the modem with respect to the mobile network makes any difference to its power consumption. Iām certainly not across what sleep modes the BM818 has and what the power consumption is in each mode and whether the sleep modes are being used at all and what conditions affect what sleep modes are possible.
Thatās a lot of unknowns.
As a blackbox modem, it is difficult to know what exact factors will influence power consumption. If you had a dedicated test rig, you could presumably measure it even though the modem is a blackbox.
Fairly obviously the modem is drawing enough power 24x7 to listen for transmissions from the tower.
I think you would have to be a 3GPP guru even to start to know what the expectations should be.
Just my 2Ā¢.
Well done for using it as daily driver and thanks for sharing!
No. Iām saying the modem loses connection to the carrier at times. The carrierās network is good.
Anything in a log file to correlate with that? I ask because then I could scan my logs to see whether I am seeing that too. I have never noticed such a problem but that doesnāt mean absolutely that it is not happening.
I havenāt looked for any logs yet, but I know itās happening when I find Iām unable to make or receive a call, at which point I take a look at the Mobile settings and discover the name of my carrier is no longer present. Re-selecting and setting the carrier again brings it back. Sometimes the ā4Gā is still present at the top of the screen.
Iām not sure what conditions trigger the behavior. Iām not too concerned yet, since itās not my main phone.
Perhaps a better title would be L5 Daily Driver dream
L5 is a device for very serious use. Do not touch it without a serious reason, otherwise you will get the message āBattery Aziz!ā (no more battery) at a crucial moment 
Letās see: approximately 10% of the battery every hour in ādo not touch meā mode without activating deep sleep - suspend mode. Ahā¦
My job is customer contact and the L5 still canāt get through my workday without me having to think about where my charger is."
Suspend device is in experimental and manual mode, subjectively it seems to me that it does its job, but I often forget to activate that option.
On the street where there is more noise, I can often barely hear the interlocutor.
The sound is relatively clear but not strong enough.
ok, there will be more upgrades and progress.
The fact that there is a GNU/Linux phone next to me at work and that it works solidly (could and must be better) makes me happy enough. A completely different eco system in a pocket edition as independent as possible, decentralized as possible. The device that changes the definition of a smartphone. IT is smart as far as I know, not as much as āthey willā
There has been progress since the creation of this post from 2+ years ago
