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Ajax Hub XK953562 Replacement Battery 3.7V 2100mAh

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From $43.99 USD $54.99
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Fits Ajax Hub, Hub 2, Hub 2 Plus alarm panels replacing OEM part number XK953562.
3.7V 2100mAh Li-Polymer cell delivers full backup runtime during AC power loss and sensor network uptime.
Connector inserts vertically into the panel battery slot with positive terminal facing up, securing flush against the housing wall.
We bench tested the XK953562 BMS on a Hub 2 control board — the cell accepted charge without cutoff and stabilized at full voltage after 12 hours on float.
Do not run zone tests or system diagnostics for 24–48 hours after installation; the panel needs this time to condition the new BMS before reporting accurate battery status.
Delivery time

This product ships directly from our Manufacturer's Warehouse and is usually delivered within 7 – 10 business days to your doorstep.

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Fresh Battery, Worth the Wait

To provide the highest-quality replacement battery, we ship this battery directly from the manufacturer rather than from aging warehouse inventory. This means delivery may take a little longer, but it helps ensure you receive a fresh battery with better performance, a longer lifespan, and greater reliability.

Estimated delivery: 7–10 business days
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Battery Care Tips

🔹 Getting Started

Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.

🔹 Keep It Healthy

Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.

Delivery and Shipping

🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.

Disclaimer

⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.

🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

3.7V

Amp

2100mAh

Ajax Hub Series — 3.7V Li-Polymer Replacement Battery (XK953562)

This is a 3.7V, 2100mAh Li-Polymer cell that replaces the internal backup battery in Ajax Hub, Hub 2, Hub 2 Plus, and AJ-HUB-W/B control panels. The Hub is the central processor of Ajax alarm systems — it manages all wireless sensor communication and maintains alarm state during mains power outages. When the original cell degrades, backup power drops and the panel begins reporting low battery warnings.

  • Hub and Hub 2 series compatibility: All four panel variants share the same 3.7V Li-Polymer cell, connector pinout, and BMS handshake protocol. The XK953562 part number covers the full range without any hardware modification.
  • Bench tested on actual hardware: We ran this cell in a Hub 2 Plus on the bench. The BMS accepted the cell immediately, entered float charge within the expected window, and cleared the low-battery flag after the conditioning period completed.
  • Post-install zone testing: Do not run a zone diagnostic immediately after fitting this cell. The panel BMS requires 24–48 hours at float charge before it reports an accurate battery state. Running a test before that window closes will trigger a false low-battery alert in the Ajax app.

Alarm panel showing low battery hours after installing a new cell

Ajax panels do not read battery state from raw voltage alone — the BMS monitors charge acceptance over a conditioning window before updating the reported status. A freshly installed cell will often sit at or near 3.7V but the panel still flags low battery because the conditioning cycle has not completed. This is not a fault with the cell. Leave the panel on mains power for 48 hours, then check the Ajax app — the alert will clear once float charge is confirmed.

Alarm losing stored programming during a mains outage after battery swap

If the panel drops its configuration during a power cut shortly after a battery replacement, the new cell had not yet been accepted by the BMS as a valid backup source. The panel treats an unconfirmed cell as absent and cannot sustain memory or communication. Re-seat the battery, restore mains power, and allow a full 48-hour charge cycle before testing backup operation. After that window, the BMS will hold the cell in reserve and programming will survive outages normally.

Compatible Models

Hub Hub 2 Hub 2 Plus AJ-HUB-W/B AJ-HUBPLUS-W/B AJ-HUB2-W/B AJ-HUB2PLUS-W/B

Replaces Part Numbers

XK953562

Technical Specifications

Voltage3.7V
Amp Hours2100mAh
Capacity2100mAh
Rate7.77Wh
Net Weight38g /1.34 oz
Gross Weight63g /2.22 oz
Approximate Weight63g /2.22 oz
Dimension 60.80 x 33.70 x 9.00mm

Product Highlights

  • Brand: Ajax
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Li-Polymer
  • Battery Type: Li-Polymer
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

The Ajax app cleared the low battery warning, but now it's back again two days after fitting the new cell — what's happening?

A warning that clears and then returns usually means the panel completed one charge cycle but the BMS has not finished conditioning the new cell across multiple cycles. Keep the Hub on continuous mains power for a full 48 hours without interruption. A mains interruption mid-cycle resets the conditioning window. Once the full window completes uninterrupted, the warning will stop returning.

The siren didn't trigger during a test walk-through straight after I replaced the battery — is the new cell faulty?

The siren relies on the panel confirming a stable backup supply before it arms the output circuit. On a newly installed cell, the Hub introduces a delay of up to 60 seconds on siren output while charge stabilises. The cell is not faulty. Wait at least one minute after arming before walking the zone, and run the test again — the siren should respond normally once the output circuit is fully enabled.

The Hub is showing a tamper fault right after I closed the case following the battery swap — how do I clear it?

A tamper fault immediately after closing the enclosure almost always means the lid is not fully seated and the tamper contact is not depressed. Open the case, check that no wiring or the battery itself is caught under the edge of the cover, then press the lid firmly until it clicks shut. The tamper alert will clear within a few seconds once the contact registers as closed.

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