Laird BT923-00072 Crane Remote Replacement Battery 7.2V 2000mAh

Laird HANDY Control II / III & TC100 — 7.2V Ni-MH Replacement Battery (BT923-00072)

This is a 7.2V, 2000mAh Ni-MH replacement battery for the Laird HANDY Control II, HANDY Control III, and TC100 wireless crane remote control systems. It matches OEM part number BT923-00072. Capacity figure comes directly from product data — 14.4Wh total energy.

• HANDY Control II, III, and TC100 compatibility: All three remotes share the same 7.2V six-cell Ni-MH pack format, the same physical connector, and the same charge management circuit — so one battery revision covers all three units without modification.
• Bench tested on actual hardware: We ran this pack through charge-discharge cycles on the BT923-00072 platform. The internal BMS held the cutoff voltage stable across repeated solenoid activation bursts, which draw significant inrush current compared to standard handheld remotes.
• Monthly charge discipline for infrequent crane sites: If the remote sits unused between shutdowns or seasonal work gaps, charge the battery once a month. Ni-MH cells self-discharge at roughly 1–2% per day — a pack left for three months can drop low enough that the remote's charge circuit struggles to recover it.

Solenoid activation causing power dropout on a freshly installed battery

Crane remotes pull a spike of current each time a solenoid or relay fires. On a partially discharged Ni-MH pack, internal resistance rises enough that this inrush drags the terminal voltage below the remote's minimum operating threshold. The unit resets or drops signal mid-operation. A full charge reduces internal resistance and keeps the voltage rail stable through those activation peaks. If dropouts continue on a fully charged pack, the cell stack may have capacity fade — measure resting voltage after a full charge; a healthy 7.2V Ni-MH pack should read 8.4–8.7V at rest.

Remote shows low-battery indicator immediately after fitting a new pack

Replacement Ni-MH batteries ship at storage voltage — typically 6.0–6.5V — not at full charge. The HANDY Control reads this as a low state and flags it on the indicator. This is normal and is not a fault with the battery or the remote. Connect the unit to its charger before first use and run a full charge cycle. The low-battery warning should clear once the pack reaches approximately 7.8V or above.