Question 1

So this UPS gives the power (210W) but not the capacity, i.e. how long it will run at 210W (or at some lower wattage). It doesn't give the capacity of the battery either, which makes me think it must have really poor capacity if its not declared ?

Accepted Answer

You can check out the runtime chart at APC's site for this item (Newegg does not allow links).
At 210W, the published runtime is 5.6 minutes.  
At half load, you should get 20.7 minutes.
It is a small UPS, so you won't get a lot of runtime from it.

Question 2

Can this be used for sump pump backup?

Accepted Answer

For most small home sump pumps this would likely be fine, but it would depend on the power requirements of your specific pump.

Question 3

Is the RJ45 protection for 10/100 or Gigabit?

Accepted Answer

Not clear on your question, since I do not think this unit has "network" protection.   
the RJ45s on the back are only for protecting your incoming phone/fax/modem/DSL line, and then from the UPS to your DSL modem, etc.    The manual states "All speeds of DSL", which I would guess is in the 1-10Mbps range.  no where near the 10/100/1000 speeds of Ethernet.

But I use only Fiber networks, so I have never used this feature.

Note that the 3rd RJ45 port is for connection to a USB port for their monitoring software.

What you need is most likely their PNET1GB "ProtectNET" product.

Question 4

I am looking for a replacement battery for this model. Please advise?

Accepted Answer

It's often cheaper to buy a replacement batteries for UPS's than to buy a new UPS, unless you feel that the surge protection is not up to snuff. Surge protection typically will not be as effective starting 3 years of active use and later.

I do not have the exact model number, but once you do, there are several outlets online that sell replacement batteries.

If you have further questions, let me know.

Question 5

how many ouitlets are battery backed up and how many are surge protected only?

Accepted Answer

There are six outlets total, three are just surge protection and three are battery backed up.

Question 6

When the batteries go bad will this ups go into a bypass for the equipment to stay powered or will it shut down completely?

Accepted Answer

Yes! But Batteries will last for years if not ran down and always plugged in to charge, Similarly to auto batteries. Check unit voltage, one ask about is European voltage.220, USA is 120 voltage.

Brand	APC
Series	Back-UPS
Model	BK350

International Version	120V
Input Voltage Range	98 - 140V
Input Frequency	50/60 Hz +/- 3 Hz (auto sensing)

VA Rating	350VA
Watts	210W
Output Voltage	120V
Output Frequency	50/60Hz +/- 3 Hz
Outlets	6
Outlet Type	(3) NEMA 5-15R (Battery Backup) (3) NEMA 5-15R (Surge Protection)

Battery Type	Sealed Lead Acid
Battery Recharge Time	8 hour(s)
Battery Replaceable	RBC2

Alarms	Alarm when on battery : distinctive low battery alarm : overload continuous tone alarm
Interface Port	USB
Management Software	YES
Approvals	California (CEC) Battery Charger, ENERGY STAR (USA), FCC Part 68, TUV

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APC BK350 Back-UPS CS 350 - UPS - External - Standby - AC 120 V - 210 Watts / 350 VA - Interfaces : 1 x management - RS-232 - 9 pin D-Sub (DB-9), 1 x USB - 4 pin USB Type B - 3 x NEMA 5-15R

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Data Line Protection	Analog phone line for phone/fax/modem/DSL (RJ-11 connector)
Surge Energy Rating	1020J

Dimensions	6.50" x 11.20" x 3.60" (H x W x D)
Weight	12.50 lbs.

Item#: 9SIA1K656B2878