Question 1

Hi, is it normal that the display blinks on every 3 seconds? or should it stay on when it's actively charging?

Accepted Answer

I did not use it long enough to note whether this occurs or not.

Question 2

Double click needed to start charging external USB-C device (e.g. phone). Is this normal? Also, starts at around 5V/2A and switches to 9V/1A

Accepted Answer

I don't know. I purchased it and returned it without ever using it.

Question 3

How good is the self-discharge? i.e. if left in my pack with two batteries inside but not charging anything, will the unit deplete itself?

Accepted Answer

It is very low. It's not as good as just a battery protection circuitry, because this also has to detect when something is connected, but it barely uses any power to do that. Most devices and backup battery packs I have used, including much more expensive ones use much more, especially when they are always ready to output on the 5V only ports all the time, but this is very clever in using a tiny amount of power to check the connection status and not in a constant on state, but it seems like in a pulse state to lower the power use even more. It also won't trigger if the load isn't high enough unless you switch it to the new mode of low drain devices that will just keep it outputting even if yhe device(s) don't draw enough current. Which is so useful. The device also shuts off and stops looking for a trigger if once the plugged in device either stops drawing enough current or says that it's full via handshake. The device has to be used in a different port or have that charging device unplugged and a new device plugged in for it to look for a trigger. The power saving on this little pack is actually quite impressive and a fairly significant improvement over the last generation which was already really good. I haven't had the chance to do a long term test, but so far for a week or two, the charge drop is identical to what the batteries would lose on their own if left alone. This pack really doesn't use power unless it is providing power and then it isn't really using much for itself at all. The tested capacities I get from the batteries into a meter is almost identical to what I am getting put into my devices being charged, which makes sense, dc to dc conversion is super efficient. I have noticed that the percentage shown tends to drop faster on the 5V for the USB A port than anything on the USB C port. Sometimes it's necessary to use the USB A port because using the QC is the only way to use a lower voltage and provide a slower charge to a device without having to get a separate pd trigger, which would also take a little bit of power, but it seems like the buck and voltage regulation on the USB A are just a little bit less efficient at least when not using a QC protocol. When charging my phone, it will pull the same amount of watts at 5V from the USB A port or 9V on the USB C port. It's still taking the same amount of power from the batteries to get the same amount of power out to the phone, and higher amperage does tend to be lossy as a result of higher heat, BUT... The device isn't really running hot. I haven't opened it up to see if there is a specific component that is heating up and losing power to heat, but touch tests and thermometers are showing that the device is getting to the same temperature overall in each side of the buck/vrm. Also... The efficiency is better on the USB C port when it is running at 5V at the same amperage or 9V at the same amperage... I think that I just got a unit that lost the silicon lottery and I don't expect this to be a problem for anyone else, but I wanted to put it out there just in case the QC components and buck converter/vrm are not as good as the PD buck converter/vrm. It does lead to a fairly significant difference in the amount of charge I can get into my phone although it isn't exactly a problem. As far as maximizing efficiency goes, the device does provide all of the protection that you need for batteries, so additional battery protection is not really an issue if you are only going to use this for charging and discharging or if you are going to use another device with protections, good and reliable ones, for charging and you plan on using the lowest current to charge them which is what's best for your batteries. Additional protection is great when the batteries are in storage or if they are dropped, because they could end up touching some stuff that causes a short, but if you are careful and really know what you are doing,then go unprotected 21700's THAT ARE RATED FOR HIGH DISCHARGE

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18650 Battery Charger XTAR 2023 PB2S USB C Charger (NOT Included Battery)

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