How to recycle UPS battery pack

I have a UPS at home. Not that brown truck thingy.
I mean Uninterrupted Power Supply, UPS.

It's a small battery pack that goes between the power outlet and your computer, so when the wall outlet loses power you still have 3-4 minutes to save all your stuff and turn off the computer.
Brilliant!!!

Mine is 6-year-old one from APC. It's been working great until about a month ago.
It started beeping like nuts-day and night.
I checked out the customer support website and it was my old battery that's causing the problem.
The manufacturer says replacing the battery back every 2-3 years is recommended.

2-3 years. Hmm. I've been using it for 6 years.
So, I found the best price at Amazon, and got it in a few days.
Then, next question was, "what am I gonna do with the old one?"

This is the old one. Do you see the sides of the pack are burst open?

I couldn't just toss it in a dumpster because it's lead-acid battery, the same type as the car batteries.
So, I went to the local Waste Management place. They said, "Oh, we don't accept batteries here."
Oh, bummer.

Then I took it to the city recycling center. The guy working there took a look at it and said, "I've never seen this kind before. I don't know what to do with it. I can't accept this."
Bummer.

So, as any wise person should do, I Googled what to do with it.
And I found out that APC actually recycle these battery packs for free. I just tell them the model number and they generate the shipping label and I can just bring it to the local UPS store (yes, the brown guys).

I'm sending the old battery away tomorrow.
By the way, if it's not from APC, they don't accept it. So, if you have other brands like Belkin, ask them what to do with it.