Ascom MIRA Cordless Phone Compatible Battery 4.8V 1800mAh

Ascom MIRA — 4.8V Ni-MH Replacement Battery (GOB-3060)

This is a 4.8V, 1800mAh Ni-MH replacement battery for the Ascom MIRA cordless handset. It slots in place of the original GOB-3060 pack and restores power to the handset for daily DECT wireless communication. Capacity is 8.64Wh — matched to the original specification.

• MIRA handset compatibility: The MIRA handset uses a 4.8V Ni-MH pack with a specific cell arrangement to match the base station's trickle-charge circuit. A mismatched voltage or chemistry trips the base's charge termination early, so only a like-for-like Ni-MH replacement keeps the charging cycle intact.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on a DECT handset bench rig. The BMS accepted the NiMH charge curve without cutoff errors, and cell balance held across five full cycles.
• First-charge protocol for NiMH handsets: After installing, seat the handset in the base and leave it for a full 16 hours before first use. NiMH cells in cordless phones need a slow initial charge to reach rated capacity — skipping this leaves the pack underformed and talk time noticeably short from day one.

Base station showing no charge light on a new GOB-3060 pack

NiMH cells self-discharge during storage. If the pack voltage drops far enough, the MIRA base station's charge circuit won't recognise it as a valid battery and won't initiate the charge cycle. This is a threshold issue, not a faulty battery or base. Place the handset in the base and wait up to 30 minutes — the base circuit on most DECT phones will attempt a recovery trickle at around 1.0V per cell before switching to normal charge. If the light still doesn't appear after 30 minutes, remove the handset and reseat it firmly to ensure full pin contact.

Handset loses DECT pairing after battery swap

Removing the battery cuts all power to the MIRA handset, including the memory holding the base station pairing data. Some DECT handsets store pairing in volatile RAM, so a full power loss wipes it. After fitting the new pack and completing the initial charge, re-register the handset at the base using the subscription button — on most Ascom MIRA bases, hold the registration button for three seconds until the base LED flashes. The handset should detect the base within 60 seconds and prompt confirmation.