Great UPS devices. Would buy again. Currently own 3 of them.Make sure to open the panel on the bottom to connect the battery. I recommend keeping the test results receipt attached to the UPS, so that you know how old the device is, and can replace the battery when the time comes. estimate for most people is 5 years or so.from the moment I integrated the APC 850VA UPS into my setup, this uninterruptible power supply has proven to be a reliable safeguard against power fluctuations and unexpected outages, ensuring my operations run smoothly without interruption.I use this in a home office environmentPros:The efficiency of the APC 850VA UPS is unmatched. It provides ample backup power, allowing me to safely shut down my computer equipment or continue running essential devices when the unexpected occurs. The inclusion of two USB charger ports is a thoughtful addition, offering the convenience to charge my devices directly from the UPS.what sets the APC 850VA UPS apart is not just its performance but also its user-friendly design. The setup was straightforward, and the clear indicators keep me informed of the power status at a glance. It's evident that this UPS is built to cater to the needs of both home and office environments.Cons:packaging is mostly paper, but there's still some plastic involved.the spade plug for the battery is a little hard to plug inthere's a small spark when you first plug in the battery, so be aware.In summary, the APC 850VA UPS is a top-tier choice for anyone seeking a dependable power backup solution. It's a product that delivers on its promises and one that I confidently rate 5 out of 5 stars.