TalentcellMini UPS Uninterrupted Power Supply 27000mAh 97.2Wh Lithium ion Backup Battery Pack with DC 12V/9V and 18W USB-A/USB-C PD Output for Router/Modem/LED Light, CCTV Camera, Smartphone and more

This is a great back up for my modem and router. Power outages in this area are frequent and short (normally less than 2 hours). This small unit can keep my WiFi router and modem both running for as long as has been needed in the past 2 years. I just needed to find the right cables to connect DC out from the Talentcell direct to the DC in. That's what makes it last so long! Great, inexpensive solution to keep the internet connection during an outage

I have wanted a way to keep my internet on during power outages for the security system to transmit alarms for about a decade. I was looking at possibly buying a small standby UPS which would have provided about 1 hour of backup time for around the same price as this product. I knew I had about 33watts at 120v when searching.I measured each of my 5 devices(Modem, Router/Gateway, Switch, AP, Smart Home Gateway) at DC and found they only consumed 14watts. That means the rest of the 19watts of power was wasted due to heat in the inefficient 5-1A power adapters. I also knew that it was all going to be less than 2A at 12V so this product would work. It actually comes out to be about 1.2A.Installation is easy and makes sense because now I only have 1 power supply VS 5 supplies. I have 3-12V devices, 1-9V device and a 48v POE injector. I am still waiting on a 12V to 48V DC-DC boost converter to be delivered so it has not been connected, but should work fine once it arrives.I decided to do a discharge test to verify the watt-hour rating and see if the supply could recover from a discharge. I disconnected the 12.6V in and connected a volt meter to the input jack. The input jack is directly connected to the cells so you can measure cell voltage regardless of the on/off switch position. As noted above I only had 4 of 5 devices connected for a total load of 10.5watts. The cell voltage started at 12.6v.I noticed that early in the test, about 1.25 hours, it went from 4 lights to 3 lights indicating only 75% charge remaining. The cell voltage was at 11.9v. It had only discharged just over 10.5watt-hours. The test continued for 3 hours without change and the voltage was still at 11.5v. At the 4.5hr mark the cell voltage finally reached 11.1v where I believe the 50% charge point should have been, but the 75% charge light remained on. With 10.5watts at 4.5hours it had discharged 47.25watt-hours which is also about half of the 98watt-hour capacity. At the 5 hour mark the cell voltage was 11.0v. Finally at the 5hour and 25min mark the cell voltage dropped to 10.9v and the 75% light started to flicker marking only 50% charge remaining. I then stopped the test since I did not want to too deeply discharge the battery or stress my electronics with under voltage.So one of my observations was the LEDs are really just a quick reference for if it is fully charged or partially discharged. I think whoever designed it might have not understood the nonlinear state of charge for a li-ion battery. It may be that they only had the option to design the LEDs to operate at 11.9v,10.9v, 9.9v, 8.9v with Zener diodes because that was all that was available. I don't know but it is something good to know during use. So 4 lights is around 100% to 85% and 3 lights is 85% to 40%. I did not test any further.I think 5 and half hours of backup is excellent and if I continued it looks like it would have continues past 8 hours before dropping to 9v. I don't think I will need it that long. If I have a long power outage I will run a generator. At least if I am away from the house the internet will continue to run during a power outage. Any security related messages can be passed.The other aspect I love about this is I now have less power adapters and the overall power consumption has dropped by consolidating power adapters. The power savings will pay for this device after about 4.5 years.

Delivered on time and great condition. Unpacking was easy and I could get to instructions quickly. Out the box the battery had a full charge. This works well as my primary backup for my cable modem. It has a few more jacks that can be used for other things like an ethernet switch. The unit is well made, looks good and is small enough to put alongside your equipment. I really like it, I think you will to.I highly recommend this, it does a good job.

The good: You get 12 x 18650 cells hardwired in a box. It provides power for a very long time.The bad: You don't see the battery level (or any indication of dead cells) unless you unplug the power supply. Also there is no indicator when the power supply is not connected or not providing power.My initial test when I first got the UPS showed very good results. It powered my cable modem, router and voip box for almost a full day.Incident 1: Accidental removal of the power supply was only discovered by a hard shutdown of everything after the batteries had run flat.Incident 2: During a power outage everything shut down. Since it was past the warranty period, I decided to take it apart for analysis. 12 18650 lithium cells wired with 4 cells parallel and the resulting three packs managed by a standard 3S 6A battery management board and connect back to the main board at 12V. The battery management board (see pic) had a visible fault with resistor R9 showing a bad solder connection. Not sure if that was the root cause of the problems or fallout. I took the cells out of the packs and 11 cells were completely dead not taking a charge. 1 cell showed ~3V and was rechargeable.Bottom line: I like the efficiency of this system doing away with a bunch of separate power supplies. I don't like that the cells are not removable. Putting in battery holders would have made the box a little bigger, but would have given the option of replacing cells when needed. Separate power and battery LEDs on the front of the box would make this system a lot more useful.