About this replacement
Hetronic ERGO-S — 3.7V Li-ion Replacement Battery (68303700)
This is a 3.7V, 2600mAh Li-ion cell that replaces OEM part 68303700 in the Hetronic ERGO-S wireless crane remote control. It fits the ERGO-S transmitter used in industrial crane, hoist, and material handling applications. Match the OEM part number before ordering — Hetronic makes several transmitter platforms with different cell formats.
- ERGO-S transmitter fit: The ERGO-S uses a single-cell 3.7V Li-ion pack with a specific BMS handshake and connector orientation. This cell matches the voltage rail and physical footprint of the original 68303700. Other Hetronic platforms such as the NOVA or MINI use different cell configurations and are not interchangeable.
- Bench tested on actual hardware: We cycled this cell through repeated solenoid-activation sequences, which draw brief inrush current spikes. The BMS held without false cutoff across all test cycles. Voltage at full charge measured consistently at 4.18–4.20V before load.
- Storage charge on idle remotes: Crane remotes often sit unused between jobs or seasonal shutdowns. If the ERGO-S will be inactive for more than three to four weeks, charge the battery first. Li-ion cells left below 2.5V for extended periods can trigger BMS lockout that a standard charger will not recover.
Solenoid activation causing power dropout on a new battery
When a crane remote triggers a solenoid or relay contactor, the current draw spikes sharply for 20–50 milliseconds. If the battery cell is at storage voltage rather than full charge, internal resistance is higher and voltage sags enough for the BMS to trip the output. This looks identical to a faulty battery but is a charge-state issue. Charge the cell fully to 4.2V before putting it into service — do not install and immediately operate.
Remote showing low battery immediately after fitting a new cell
Li-ion cells ship at 30–50% state of charge for transport safety compliance. The ERGO-S firmware reads cell voltage directly — at storage voltage around 3.6–3.7V, the transmitter interprets this as a depleted pack and flags low battery. This is not a fault with the cell. Connect the remote to its charger for a full charge cycle before use. Once the cell reaches 4.1V or above, the low-battery indicator will clear.