Charge Directly from a Deep Cycle battery with this Timeusb Battery Socket Outlet 

Did you realize that the USB-C output of 45 watts is shared between the two ports? You were charging two devices at the same time, from what I can tell, and that would definitely lower the wattage going into the laptop. I wish those were dedicated 100w ports, but it's still a really cool charging brick. If you had one of these and a 100AH battery at a campground, you'd be a really popular guy! :) Another really cool option this device offers is the ability to output power from the other Anderson port, running up to 40 amps worth of power to something like a 500w AC inverter.

The something called ' 12.8V Lifepo4 battery voltage chart'. Read it then you will know why it showing 13v

How does this compare to building your own project box with some USB car sockets? 65W PD 3.0+18W QC 3.0 USB C + A Socket- 2 pack is $25 12V cigarette outlet- $5 55x21 DC Barrel Jacks- $5 for a couple high quality ones that support 5A+ On/Off Switch-I’d probably get a nicer push button for $3 Voltage Display-$3 Anderson sockets- Not sure Sounds like the PD ports are doing power sharing so 45W between both C ports or even worse there’s power sharing between all the USB ports. The manual should break down this info for you. LiFePO4 nominal voltage is 12.8V but it’s max voltage is 14.6V. It’s resting voltage is typically in the 13.6V to 14.0V range shortly after the charger is removed. Then from 14.0V down to 13.2V you’ll see the voltage curve is pretty steep. Once all the cells hit 3.30V (with a small load of about 0.2C or 10A in your case) the voltage curve becomes incredibly flat until about 12V at which point the curve becomes steep again. A larger load is going to cause more voltage drop so it possible that a 1C load (50A for this battery) might see the flat part of the curve drop to 3.20 to 2.90 per cell assuming they are Grade A cells. Grade B cells can be anywhere from a little worse to unable to hold a 1C load at all, dropping the voltage so much that the BMS trips for low voltage with only a 0.5C or 0.75C load. Capacity testing can’t tell you any of this.

Great review! Would you mind sharing the link to those monitoring devices you have connected to the cell phones and the laptop? Thanks for sharing.

The timeusb 50ah lithium 12.8v battery has a voltage range of 14.6 Volts to 10 volts.

Tt

You say you test and review batteries but don't know why the meter showed 13.2v when it is a 12v battery???? Come on man!