Will this function with a 2018 Apple iMAC?

I use 2 of these to back up my entire home office - 2 computers, 3 screens, modem, router, switch, IP Phone, and it works flawlessly, I highly recommend. Should have no problems with your device.

Does the interface application work with Linux, specifically, Debian?

There is a package available for Debian called apcupsd that communicates with APC USB connected UPSes and manages system shutdowns. The PowerChute software from APC is available as an RPM from their website that you might be able to get working with alien to convert it under Debian but I'd recommend using apcupsd.

What is the watt-hour (Wh) rating of this UPS?

According to the APC website the rating is 102 VAh capacity 104 VAh runtime

Difference between BE850G2 and BE850M2?

This is a question for manufacturer. They look exactly the same. The difference might be in how audible alarm and when activates or some firmware improvements to the button control mechanism, perhaps even using new micro-controller chip inside. All to subtle for general description to mention. It does say M is the step up from G, so go with M when purchasing.

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Main image of APC BE850G2 UPS 850VA, 120V, 2 USB charging ports, 9 NEMA outlets(3 surge)- Tower - 8 Hour Recharge - 2 Minute Stand-by - 120 V Input - 120 V AC Output-Stepped Approximated Sine Wave - 6 x NEMA 5-15R

Alt view image 2 of 20 - APC BE850G2 UPS 850VA, 120V, 2 USB charging ports, 9 NEMA outlets(3 surge)- Tower - 8 Hour Recharge - 2 Minute Stand-by - 120 V Input - 120 V AC Output-Stepped Approximated Sine Wave - 6 x NEMA 5-15R

Alt view image 3 of 20 - APC BE850G2 UPS 850VA, 120V, 2 USB charging ports, 9 NEMA outlets(3 surge)- Tower - 8 Hour Recharge - 2 Minute Stand-by - 120 V Input - 120 V AC Output-Stepped Approximated Sine Wave - 6 x NEMA 5-15R

Alt view image 4 of 20 - APC BE850G2 UPS 850VA, 120V, 2 USB charging ports, 9 NEMA outlets(3 surge)- Tower - 8 Hour Recharge - 2 Minute Stand-by - 120 V Input - 120 V AC Output-Stepped Approximated Sine Wave - 6 x NEMA 5-15R

Alt view image 5 of 20 - APC BE850G2 UPS 850VA, 120V, 2 USB charging ports, 9 NEMA outlets(3 surge)- Tower - 8 Hour Recharge - 2 Minute Stand-by - 120 V Input - 120 V AC Output-Stepped Approximated Sine Wave - 6 x NEMA 5-15R

Alt view image 6 of 20 - APC BE850G2 UPS 850VA, 120V, 2 USB charging ports, 9 NEMA outlets(3 surge)- Tower - 8 Hour Recharge - 2 Minute Stand-by - 120 V Input - 120 V AC Output-Stepped Approximated Sine Wave - 6 x NEMA 5-15R

Alt view image 7 of 20 - APC BE850G2 UPS 850VA, 120V, 2 USB charging ports, 9 NEMA outlets(3 surge)- Tower - 8 Hour Recharge - 2 Minute Stand-by - 120 V Input - 120 V AC Output-Stepped Approximated Sine Wave - 6 x NEMA 5-15R

Alt view image 8 of 20 - APC BE850G2 UPS 850VA, 120V, 2 USB charging ports, 9 NEMA outlets(3 surge)- Tower - 8 Hour Recharge - 2 Minute Stand-by - 120 V Input - 120 V AC Output-Stepped Approximated Sine Wave - 6 x NEMA 5-15R

Alt view image 9 of 20 - APC BE850G2 UPS 850VA, 120V, 2 USB charging ports, 9 NEMA outlets(3 surge)- Tower - 8 Hour Recharge - 2 Minute Stand-by - 120 V Input - 120 V AC Output-Stepped Approximated Sine Wave - 6 x NEMA 5-15R

Alt view image 10 of 20 - APC BE850G2 UPS 850VA, 120V, 2 USB charging ports, 9 NEMA outlets(3 surge)- Tower - 8 Hour Recharge - 2 Minute Stand-by - 120 V Input - 120 V AC Output-Stepped Approximated Sine Wave - 6 x NEMA 5-15R

Alt view image 11 of 20 - APC BE850G2 UPS 850VA, 120V, 2 USB charging ports, 9 NEMA outlets(3 surge)- Tower - 8 Hour Recharge - 2 Minute Stand-by - 120 V Input - 120 V AC Output-Stepped Approximated Sine Wave - 6 x NEMA 5-15R

Alt view image 12 of 20 - APC BE850G2 UPS 850VA, 120V, 2 USB charging ports, 9 NEMA outlets(3 surge)- Tower - 8 Hour Recharge - 2 Minute Stand-by - 120 V Input - 120 V AC Output-Stepped Approximated Sine Wave - 6 x NEMA 5-15R

Alt view image 13 of 20 - APC BE850G2 UPS 850VA, 120V, 2 USB charging ports, 9 NEMA outlets(3 surge)- Tower - 8 Hour Recharge - 2 Minute Stand-by - 120 V Input - 120 V AC Output-Stepped Approximated Sine Wave - 6 x NEMA 5-15R

Alt view image 14 of 20 - APC BE850G2 UPS 850VA, 120V, 2 USB charging ports, 9 NEMA outlets(3 surge)- Tower - 8 Hour Recharge - 2 Minute Stand-by - 120 V Input - 120 V AC Output-Stepped Approximated Sine Wave - 6 x NEMA 5-15R

Alt view image 15 of 20 - APC BE850G2 UPS 850VA, 120V, 2 USB charging ports, 9 NEMA outlets(3 surge)- Tower - 8 Hour Recharge - 2 Minute Stand-by - 120 V Input - 120 V AC Output-Stepped Approximated Sine Wave - 6 x NEMA 5-15R

Alt view image 16 of 20 - APC BE850G2 UPS 850VA, 120V, 2 USB charging ports, 9 NEMA outlets(3 surge)- Tower - 8 Hour Recharge - 2 Minute Stand-by - 120 V Input - 120 V AC Output-Stepped Approximated Sine Wave - 6 x NEMA 5-15R

Alt view image 17 of 20 - APC BE850G2 UPS 850VA, 120V, 2 USB charging ports, 9 NEMA outlets(3 surge)- Tower - 8 Hour Recharge - 2 Minute Stand-by - 120 V Input - 120 V AC Output-Stepped Approximated Sine Wave - 6 x NEMA 5-15R

Alt view image 18 of 20 - APC BE850G2 UPS 850VA, 120V, 2 USB charging ports, 9 NEMA outlets(3 surge)- Tower - 8 Hour Recharge - 2 Minute Stand-by - 120 V Input - 120 V AC Output-Stepped Approximated Sine Wave - 6 x NEMA 5-15R

Alt view image 19 of 20 - APC BE850G2 UPS 850VA, 120V, 2 USB charging ports, 9 NEMA outlets(3 surge)- Tower - 8 Hour Recharge - 2 Minute Stand-by - 120 V Input - 120 V AC Output-Stepped Approximated Sine Wave - 6 x NEMA 5-15R

Alt view image 20 of 20 - APC BE850G2 UPS 850VA, 120V, 2 USB charging ports, 9 NEMA outlets(3 surge)- Tower - 8 Hour Recharge - 2 Minute Stand-by - 120 V Input - 120 V AC Output-Stepped Approximated Sine Wave - 6 x NEMA 5-15R

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APC BE850G2 UPS 850VA, 120V, 2 USB charging ports, 9 NEMA outlets(3 surge)- Tower - 8 Hour Recharge - 2 Minute Stand-by - 120 V Input - 120 V AC Output-Stepped Approximated Sine Wave - 6 x NEMA 5-15R

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VA: 850 VA

425 VA
550 VA
600 VA
650 VA
850 VA

850 VA / 450 Watts
6 x NEMA 5-15R (Battery Backup)
3 x NEMA 5-15R (Surge Protected)
2 USB Charging Ports
120V Input / 5 Feet Power Cord
Step-up model of BE850M2

Overview

Specs

Reviews (561)

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Best Seller Ranking	#15 in Battery Backup (UPS)

Model
Brand	APC
Series	Back-UPS
Model	BE850G2

Input
International Version	120V
Input Voltage Range	92 - 139V
Input Frequency	50/60 +/- 3 Hz (auto sensing)
Input Connection	NEMA 5-15P

Output
VA Rating	850 VA
Watts	450W
Output Voltage	120V
Output Frequency	50/60 +/- 3 Hz
Outlets	9
Outlet Type	(6) NEMA 5-15R (Battery Backup) (3) NEMA 5-15R (Surge Protection)

Battery
Battery Type	Lead Acid Battery
Battery Run Time	450W: 2 min
Battery Recharge Time	8 hour(s)
Battery Replaceable	RBC17

Details
Alarms	Alarm when on battery : distinctive low battery alarm : overload continuous tone alarm
Interface Port	USB

Surge Protection
Surge Energy Rating	354 Joules

Features
Features	Adjustable voltage sensitivity Provides the ability to adapt the UPS for optimal performance in specific power environments or generator applications. Audible alarms Provides notification of changing utility power and UPS power conditions. Automatic self-test Periodic battery self-test ensures early detection of a battery that needs to be replaced. Battery failure notification Provides early-warning fault analysis on batteries enabling timely preventive maintenance. Building Wiring Fault Indicator This LED informs users of potentially dangerous wiring problems in the wall circuit. Cold-start capable Provides temporary battery power when the utility power is out. Disconnected battery notification Warns when a battery is not available to provide backup power. Hot-swappable batteries Ensures clean, uninterrupted power to protected equipment while batteries are being replaced. Simple battery replacement Increases UPS availability by allowing quick, easy battery replacement. Transformer Block Spacing Connect bulky transformer block plugs without covering up other outlets. USB connectivity Provides management of the UPS via a USB port (not available on all models).

Dimensions & Weight
Dimensions	5.47" x 12.87" x 4.13"
Weight	9.04 lbs.

Package Contents
Package Contents	Includes: USB cable, User Manual

Additional Information
First Listed on Newegg	September 21, 2025

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APC BE850G2 UPS 850VA, 120V, 2 USB charging ports, 9 NEMA outlets(3 surge)- Tower - 8 Hour Recharge - 2 Minute Stand-by - 120 V Input - 120 V AC Output-Stepped Approximated Sine Wave - 6 x NEMA 5-15R

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Item#: 9SIC2YSKKP1705

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APC BE850G2 UPS 850VA, 120V, 2 USB charging ports, 9 NEMA outlets(3 surge)- Tower - 8 Hour Recharge - 2 Minute Stand-by - 120 V Input - 120 V AC Output-Stepped Approximated Sine Wave - 6 x NEMA 5-15R

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