About this replacement
JAY A003 HAS / Remote UDE — 3.6V Ni-MH Replacement Battery (UDB2)
This is a 3.6V, 700mAh Ni-MH replacement battery for the JAY A003 HAS crane remote control and Remote UDE modular industrial radio remote. It fits wireless transmitter units used to operate overhead cranes and hoists in industrial environments. Swap it in when the original cell no longer holds a usable charge.
- A003 HAS and Remote UDE compatibility: Both units run on the same 3.6V single-cell Ni-MH platform with the UDB2 form factor. The transmitter's internal voltage regulator and RF circuit draw from this cell directly — a matched voltage profile keeps signal transmission stable under load.
- Bench tested on actual hardware: We cycled this cell through repeated charge-discharge sequences on the JAY remote platform. The Ni-MH chemistry handled the shallow cycling typical of crane remote use without voltage depression forming across the first five cycles.
- Infrequent-use storage protocol: Crane remotes often sit idle for weeks at a time. Ni-MH cells self-discharge at roughly 1–2% per day at room temperature. If the remote sits unused for more than three weeks, charge it before the next shift — cells left fully discharged for extended periods become difficult to recover even on a dedicated charger.
Solenoid activation causing power dropout on a freshly installed battery
When the operator triggers a lift or travel command, the remote's RF module draws a brief inrush of current to activate the relay or solenoid signal burst. A Ni-MH cell at storage voltage — typically around 3.4V — has less headroom to absorb that spike. The internal resistance of a partially discharged cell causes a momentary voltage sag that the remote's processor reads as a low-battery shutdown. Charge the battery fully to 3.6V before first use in the field to eliminate this.
Remote showing low-battery indicator immediately after cell swap
A new Ni-MH cell ships at storage voltage, not full charge — usually 3.3–3.4V. The JAY remote's battery monitor circuit compares resting voltage against a cutoff threshold, and a cell at storage voltage can sit close enough to that threshold to trigger the low-battery LED. This is not a faulty cell. Place it on the charger until the charge indicator confirms completion, then reinsert — the remote should clear the warning at or above 3.5V.