How to Replace a CyberPower 1500VA UPS Battery

photo of a cyberpower 1500va UPS

Is your CyberPower 1500VA (CP1500AVR/CP1500C) no longer supplying power to your devices when the power goes out? It may be time to replace the battery! I originally bought one about 4 years ago and during a short power outage a few weeks ago, the batteries no longer provided any power, so I had to replace mine which took about 15 minutes of effort. You can watch how to do it below, or continue reading on for a written guide on replacing a CyberPower 1500VA UPS battery:

Buy a replacement battery

First thing you need to do is buy a replacement battery (actually, it’s two batteries wired together). If you want to buy a CyberPower branded replacement, it comes with the two batteries already “put together”. You can also buy 3rd party replacement batteries considerably cheaper and appear to be just as good.

If you want the CyberPower branded replacement (comes as two batteries already taped/wired together), you’ll want part number RB1280X2A:

Or, you can save some money (about $30 less at the time of this post) and go with a different brand, such as two of these ExpertPower EXP1290 batteries:

If you buy 3rd party, you’ll need to re-use the tape and other easily removable parts from the old batteries. It’s easy to do and will be explained later in this guide. Also, while I’ve had good luck with ExpertPower branded batteries in the past for use in some PowerWheels and Verizon FIOS ONT boxes, this is my first time using them in a UPS. While I don’t expect any issues, I’ve only been using them for a few days, but general reviews on amazon appear to be favorable!

Remove the front cover

Once you have your replacement batteries, you need to first remove the front cover to get access to the old ones. Start off by turning off the UPS. To do so, press the main button on the top of the front panel, and go ahead and unplug it from the wall. Next, place the UPS on it’s left side (when looking at the front) and remove the single philips screw on the bottom of the front cover:

Then, slide the front cover down about an inch, and “rotate” it upwards as if there was a hinge at the top; the panel is connected by wires at the top, so you don’t want to simply pull the panel completely off:

animated gif showing the front panel being removed from a cyberpower 1500va UPS

Remove the old batteries

With the front cover out of the way, it’s time to remove the old batteries. First, unplug the positive (red) and negative (black) wires:

For me, I wasn’t able to get a good enough grip on the connectors. Therefore, I used two pairs of pliers to help pull them apart:

unplugging the battery cables, part of the How to Replace a CyberPower 1500AV UPS Battery article
With the wire connectors removed, grab the plastic tabs on the bottom of the batteries and pull them all the way out of the UPS:

Reuse the tape, wires, and plastic separator

If you decided to use CyberPower branded replacement batteries, you can skip this step since the new batteries are already joined together. If not, you’ll need to reuse the tape, wires, and plastic joiner from the old batteries.

Remove the tape

The tape on mine wasn’t particularly sticky or hard to remove, so it should peel right off. For what it’s worth, I started by peeling off at the tabs and then continued all around:

With the tape removed, you can now see how the two batteries are joined. There’s a plastic divider and three wires in total:

showing the two batteries pulled apart once removed, part of the How to Replace a CyberPower 1500AV UPS Battery article

Remove the wires

You will reuse the wires and plastic joiner between the batteries. I found it easiest to remove the wires from one battery at a time; remove them from one old battery then reconnect to a new one. To make following this guide easier, have the left battery with terminals at the top and the right’s at the bottom.

  • The left battery, will have the black wire with the plastic cap (wire with the green dotted line in the photo below) connected to it’s negative (black) terminal.
  • On left battery’s red (positive) terminal will be the other, longer, black wire. This one will go through the plastic joiner and connect to the black (negative) terminal on the right battery. This is the yellow lined wire in the photo.
  • Then, the red wire will have it’s non-plastic capped side connected to the red (positive) terminal of the left battery, and routed through the plastic joiner
diagram showing how the internal wires need to be wired to the batteries, part of the How to Replace a CyberPower 1500AV UPS Battery article

Next step is to route the plastic capped wires back through the plastic joiner. There is a notch along the top on the other side that they have to fit through. When pressing the batteries together, make sure the wires aren’t being pinched anywhere. It may take a bit of nudging and moving the wires around, but it can be done:

Reapply the tape

The batteries won’t stay tight against the joiner without being held with your hands, but that’s what the tape is for! I suggest turning the combined pack vertically to allow the weight of one battery hold them both tight against the plastic joiner. Start with one end of the tape and start to apply it to one of the long sides. Then, simply wrap it around until you have a fully assembled “battery pack” laying back on it’s side:

Put the CyberPower 1500VA UPS Battery back in

With the new battery ready, whether you bought the CyberPower branded or 3rd party one, it’s now time to put it back in the UPS. Slide it back in while making sure the red and black wires from the UPS remain out of the way:

Then, connect the wires together (red to red, black to black). Note that they’ll only connect in one orientation; if they’re not fitting together, try twisting one around and try again:

showing the new batteries installed and wires reconnected, part of the How to Replace a CyberPower 1500AV UPS Battery article

Now it’s time to put the front panel on. Start by holding the battery wires flat against the batteries in order to help make room for the front cover:

placing the front panel back on the UPS, part of the How to Replace a CyberPower 1500AV UPS Battery article

Then, hold the cover against the batteries such that it’s a little less than an inch past the bottom edge:

sliding the front panel back on, part of the How to Replace a CyberPower 1500AV UPS Battery article
Make sure the front cover is against the UPS on all four sides and then slide it to the top of the UPS. If all the clips from the front panel are properly attached to the UPS, there should be no gaps between the panel and UPS. If not, one of the sides may not be against the UPS as shown below:
showing what it looks like if the panel isn't correctly connected to all four sides, part of the How to Replace a CyberPower 1500AV UPS Battery article

With the front panel attached, put the single philips screw back in:

placing the screw back into the UPS, part of the How to Replace a CyberPower 1500AV UPS Battery article
And now you’re done! You can press the power button to test out your new batteries (assuming they have any charge):
powering on the UPS with the new batteries installed, part of the How to Replace a CyberPower 1500AV UPS Battery article


Reading this guide to replace your CyberPower 1500VA UPS battery will probably take longer than actually doing it! If you opt for the more expensive CyberPower branded battery replacement, it’ll take even less time; though even with the 3rd party batteries, it’ll add maybe 10 minutes to the job.

2 thoughts on “How to Replace a CyberPower 1500VA UPS Battery”

  1. You bought the wrong battery. Those are more work and never last as long. Ghetto battery and not proper. Sure you can go to a junk yard a take a battery out of a car and rig it to work as well.

    1. How did I buy the wrong batteries/what makes these not proper? The CyberPower battery is simply two 12v 9ah lead acid batteries (along with the plastic separator and wires, which you can reuse from the original batteries).

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