【Junk】APC ES550 (BE550G-JP) UPS Uninterruptible Power Supply

APC ES550 (BE550G-JP) UPS with battery backup and surge protection. Connector is damaged.

- Model: APC ES550 (BE550G-JP)
- Features: Battery backup, surge protection
- Accessories: USB cable
- Condition: Connector is damaged

Thank you for looking.

This item was used for about 5 years when I was running a server at home.
I was using the genuine lead-acid battery, but it started showing an error, so I replaced it with an aftermarket one and continued to use it. After I stopped running the server, I connected it to my wireless router and other devices, but it showed an error again, and then I put it away.
I recently found it while cleaning out my warehouse and opened it up. I discovered that the internal connector had melted and the pin assignments were rusted.
The internal aftermarket battery also seemed to be slightly swollen, so I disposed of it. However, the casing remains, so I am listing it in case someone wants to repair it and use it.

The unit powers on, but since I do not have a working battery, its operation is unconfirmed.

According to the manufacturer's website, production of replacement batteries has already ended, so use of this item is entirely at your own risk.

Reference: https://www.se.com/jp/ja/faqs/FA53888/

Accessories include the main unit and the USB-LAN connection cable required for setup.
I have the manual from that time saved digitally, and I can print and provide it if requested.

Thank you.

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Added May 15, 2026

The aftermarket battery I previously obtained is still available on Amazon, so I am including the URL for your reference.

URL: https://amzn.asia/d/01ucSnoh