Replacement internal backup battery for Ajax Hub 2 and Hub 2 Plus. This rechargeable Li‑ion / Li‑polymer battery pack restores autonomous operation after mains loss. It is the compatible/OEM style pack commonly referenced for Hub 2 (4G) and Hub 2 Plus units.

• Chemistry: rechargeable Li‑ion / Li‑polymer single cell.
• Nominal voltage: 3.7 V.
• Capacity: 3000 mAh (3 Ah).
• Connector: 3‑pin cable (used on hubs manufactured since mid/late 2022) — verify your hub’s connector before ordering.
• Typical runtime: up to ~15 hours (actual autonomous operation varies by hub configuration and communications usage).

Use cases: replacement internal backup for Ajax Hub 2 (4G) and Hub 2 Plus installations where the original battery has degraded or failed. Suitable for installers, maintenance engineers and end‑users replacing a worn battery.

Important: Confirm your Hub model, serial/manufacture date and whether it uses the 3‑pin connector before purchase. Follow Ajax’s official battery replacement procedure for safe fitting. Incorrect battery type or improper replacement may damage the hub or create safety risks.

Safety & disposal: Do not puncture, crush or expose to fire. Dispose of used batteries according to local e‑waste regulations. If unsure, consult a qualified installer or the Ajax support guidance.