Teletec AK5 Crane Remote Replacement Battery 3.6V 2000mAh

Teletec AK5 — 3.6V Ni-MH Replacement Battery (BA-0005)

This is a 3.6V 2000mAh Ni-MH replacement battery for the Teletec AK5 wireless crane and hoist remote control. It replaces OEM part numbers BA-0005 and 80201902. Voltage and capacity match the original cell specification exactly.

• AK5 remote compatibility: The AK5 uses a dedicated 3.6V Ni-MH cell — not a standard AA pack. The connector housing, voltage rail, and physical footprint (57.20 × 46.00 × 19.30mm) must match for the remote to recognise and draw from the battery correctly.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the AK5 platform. The battery accepted a full charge without fault, and the remote responded to all control inputs including solenoid activation without voltage dropout.
• First-install charge on crane remotes: Ni-MH cells ship at partial storage voltage — typically 30–50% charge. Do not treat this as a full charge. Crane remotes draw a sharp inrush current at solenoid activation; a partially charged Ni-MH cell can sag enough under that load to trigger a low-voltage cutoff. Charge fully before putting the remote back into crane or hoist operation.

Why the AK5 remote cuts out during solenoid or relay activation

Solenoid and relay coils draw a brief but sharp inrush current at the moment of activation — several times higher than the remote's steady-state draw. A Ni-MH cell at partial charge has reduced internal headroom to absorb that spike. Voltage sags below the remote's minimum operating threshold, and the AK5 drops out momentarily or resets. This happens even when the battery indicator shows charge remaining. A full charge before use eliminates this — target 4.2–4.5V measured at the battery terminals after a complete charge cycle before reinstalling.

AK5 remote not powering on after months of sitting unused

Ni-MH cells self-discharge faster than Li-ion — an AK5 left in storage for three or more months may have a battery sitting near or below 1.0V per cell. At that voltage the remote will not power on, and connecting a charger may show no response initially. Leave the battery on charge for at least 30 minutes before testing; most chargers will begin trickling current into a deeply discharged Ni-MH cell and recover it. If the remote still does not power on after a full charge cycle, measure voltage at the battery terminals — a healthy fully charged cell should read 1.35–1.45V per cell (4.05–4.35V total at the pack).