Vertiv Liebert Power-UPS Lithium, 400VA/240W, 120V, Lithium-Ion, Standby UPS, (4) NEMA 5-15R outlets (3 Battery Backup), Energy Star Certified, Compact Lightweight (PUL-400LVT)

Bought it about 2 months ago. Could not handle a desktop computer being plugged in. Finally was able to test during a real power outage. All it had to do was to power wifi equipment for about 10-15 seconds. The whole thing tripped and shut off. Not sure why and could have been the result of a surge, but definitely not acceptable. My larger APC unit worked without an issue. Disconnected it and returning it.

I deducted two stars because at the current price of $178 there really should be included an LED that shows the battery charge level. You will have no way of knowing how much battery power is remaining in the event the battery kicks in during a power outage. Also, it would be nice to just know the battery charge level in general, which would indicate in the future when it's time to consider replacement because we know that all rechargeable batteries lose capacity over time. I love the idea of a lithium battery UPS, but I feel not having some kind of battery level indicator is a big mistake and disappointment. I used to use the APC lithium battery UPS units that are no longer made and which was quite less expensive, and those units had a battery level indicator. So again, this unit should too. I bought 3 of these Vertiv UPS units because they are the only small lithium UPS units available as of this writing, but am unhappy Vertiv chose not to put battery level LEDs or percentage numbers on them, even if it would have added a small increase in the price.

I received the UPS in an undamaged box, on time delivery. The UPS unpackaged easily in well designed packaging with no damage. Plugged the UPS in and after several hours tested the UPS output. Note: there is no display to indicate fully charged. I plugged in a 250 watt ceramic space heater with an integral fan. Total rated capacity is 250 watts. I unplugged the UPS then started the heater with both UPS and fan in a room at 68 degF ambient. The UPS beeped per design indicating loss of power. Beep changed rate as battery dropped charge per design spec. UPS ran the load for 4 mins and 36 sec, then shut down. RMS voltage is within spec. Don’t have a way to measure waveform quality.

I purchased this because I felt a lithium-ion UPS would be more efficient and last longer than a regular acid battery UPS. My router, modem and Ooma phone base are connected to the three UPS outlets. I got this to keep the power going for the internet-based phone in case of an electricity outage in the house. For longer term power I have a couple of Bluetti power stations that can be hooked up if needed. I tested the unit when I had to switch some plugs around. The unit beeped to alert me to the power being disconnected, and the UPS kicked in without any interruption. We thankfully haven't had any power outages so I can't make any further comments. I just hope I never really have to make use of this UPS but it is good to have just in case.

My biggest concern with this was could I mute the alarm even if the alarm was not going off. The answer is YES. This is small, light, and just the right price point for my comm closet. Yes, I wish I could monitor it, but with the price, a 5yr warranty and 8-10 yr battery lifespan, I’ll be ok. I searched for the same battery supposedly in this (12.8V 3000 mAh (38.4Wh)), and the prices were 75+. Given that this package includes battery management and surge suppression, I consider the price a steal. It’s sealed with 4 Philips screws, I don’t see any anti-tamper tape, but not taking my chances of opening until after the warranty period. Have not tested runtime or anything else, but I will update this as I learn more. I’ll certainly be ordering another. UPDATE: The only negative is the smell. It has a very strong electronics smell.