is this an OEM product?

Sorry, I don't know if it is an OEM product. But I can say we are still using it after a few years. I'd buy it again.

This product is CLEARLY advertised as APC officially branded and original from them, NEW. WHY are so many people receiving offbrand units?

FYI, I had 3 UPS devices with batteries that failed because the batteries were beyond useful life (around 4 to 5 years old) I had been told to look under the APC label to see who the MFR was, I doubted there was anything. Yet, I peeled back APC's label and found another company that actually produced the batteries. APC only slapped their name of another companies manufactured batteries. All 3 UPS were bought new, so they had the original APC batteries in them and all 3 had batteries with APC labels, but under the label was a different MFR. The rhetoric from APC is marketing for the most part. I ended up looking for the same company that mfg the batteries for apc for my devices (they were different mfr's (I had 2 different models) So I found the same batteries and mfr and they worked perfectly. note some mfr's produce different quality grades of batteries. That's why I looked for the same mfr and I could compare their stock numbers to ensure I was getting the same part replaced. In total I saved $140 for new batteries for the 3 ups devices.

how can be sure that the units that i bought are original? i need 35 pieces

Thank you for reaching out to us. All replacement RBC kits have a model and serial number on a white bar code sticker. If you need to check the age of the RBC kit you can contact out support center and we can determine the age by the serial number. http://www.apc.com/us/en/support/contact-us/index.jsp

Manufacturer	APC
Model	RBC7
Model Year	2005
Product Dimensions	10.16 x 30.23 x 3.56 cm; 11.66 kg
Batteries	1 12V batteries required. (included)
Item model number	RBC7
RAM Size	128000 MB
Computer Memory Type	DRAM
Additional Drives	DVD
Processor Count	1
Hardware Platform	PC
U-Rack Size	1
Graphics Card Interface	AGP
Standing screen display size	669.29 Inches
Colour Screen	No
Voltage	240 Volts
Power Source	battery powered
Battery Description	12v
Batteries Included	Yes
Batteries Required	Yes
Wireless Type	802.11b
Does it contain liquid?	No
Has Auto Focus	No
Includes Rechargeable Battery	No
Includes remote	No
Programmable Buttons	No
Manufacturer	APC
Item Weight	11 kg 700 g

Battery Cartridge**New Retail**

Details

Description

Specifications

Common Questions

Battery CartridgeNew Retail