It's the same authentic APC battery as recommended on APC's Battery Replacement page (obvious APC web site, select UPS Batteries and Upgrades, enter your model number from the label on the bottom of the UPS (the actual model number, not the name embossed on the casing)

Everything, from voltage ratings on the battery to the model number, RBC32, are the same

I was careful to determine my exact APC model number before ordering, and comparing the dimensions and photos of the batteries for sale.