Question 1

Will this function with a 2018 Apple iMAC?

Accepted Answer

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.

Question 2

How many outlets does the APC BE850G2 UPS have and what types are they?

Accepted Answer

The APC BE850G2 UPS has a total of 9 outlets: 6 NEMA 5-15R outlets for battery backup and 3 NEMA 5-15R outlets for surge protection.

Question 3

What is the battery recharge time for the APC BE850G2 UPS?

Accepted Answer

The battery recharge time for the APC BE850G2 UPS is 8 hours.

Question 4

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

Accepted Answer

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.

Question 5

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

Accepted Answer

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

Question 6

Difference between BE850G2 and BE850M2?

Accepted Answer

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.

Brand	APC
Series	Back-UPS
Model	BE850G2

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

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

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

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

Item#: 9SIC5N7KT67133