About this replacement
Hetronic NOVA XXL — 3.7V Li-ion Replacement Battery (68303600)
This 3.7V 7800mAh Li-ion cell replaces the original battery in the Hetronic NOVA XXL wireless crane remote control. It fits directly against OEM part numbers 68303600, 68108870, 68108875, and 68108880. The NOVA XXL is used to operate overhead cranes and hoists in manufacturing plants, warehouses, and construction sites.
- NOVA XXL platform fit: The four OEM part numbers listed above cover successive production batches of the NOVA XXL remote — same 3.7V rail, same connector pinout, same BMS handshake protocol across all variants. One cell covers the full range.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a NOVA XXL unit. The BMS accepted the cell without fault codes, solenoid activation drew current normally, and the remote held its radio link throughout load events without voltage dropout.
- Idle-period charge schedule: If the remote sits unused for weeks at a time — common on job sites between crane contracts — charge the battery once a month. Li-ion cells discharged below 2.5V per cell enter a BMS lockout state that a standard charger cannot reverse.
Solenoid activation causing power dropout on a freshly installed battery
When the NOVA XXL triggers a solenoid or relay command, the inrush current spike can momentarily drag cell voltage below the BMS low-voltage cutoff threshold. A cell at storage voltage — around 3.6V — has less headroom to absorb that spike than a fully charged cell sitting at 4.1–4.2V. The BMS then cuts power to protect the cell, and the remote shuts off mid-operation. Charge the battery fully before putting it back into active crane service — a full charge gives the cell the voltage buffer it needs to ride through inrush events without tripping the cutoff.
Remote showing low-battery warning immediately after cell swap
Replacement cells ship at storage voltage — typically 3.6V — not at full charge. The NOVA XXL firmware reads cell voltage on startup and flags anything below its low-battery threshold, which sits above storage voltage on most firmware versions. This is not a fault with the new cell. Connect the remote to its charger and bring the battery to a full 4.2V before use. The low-battery indicator will clear once the charge cycle completes.