About this replacement
Clarke-Tech CT 2013 — 11.1V Li-ion Replacement Battery (HW18650-3S)
This is an 11.1V 2600mAh Li-ion battery pack for the Clarke-Tech CT 2013 handheld survey and diagnostic instrument. It replaces OEM part number HW18650-3S directly. The pack measures 69.40 × 55.20 × 19.50mm and carries a 28.86Wh energy rating.
- CT 2013 platform fit: The CT 2013 uses an 11.1V three-cell Li-ion architecture with a BMS that monitors cell balance and communicates pack state to the instrument firmware. Any replacement must match this voltage rail and connector pinout exactly — a mismatch at either point prevents the instrument from powering on.
- Bench tested on actual hardware: We ran this pack through probe initialisation sequences and sustained sensor logging loads. The BMS held stable across both — no nuisance cutoffs during the current spike at probe power-up and no voltage dropout during extended measurement cycles.
- Pre-deployment calibration cycle: After fitting this pack, run a full calibration sequence through the CT 2013 instrument menu before heading into the field. The instrument maps battery state during calibration — skipping this step causes the low-battery warning to trigger prematurely on your first measurement session.
BMS lockout after the CT 2013 sat unused in a carry case for months
Li-ion cells self-discharge slowly in storage. If the CT 2013 was left unused for several months, cell voltage can drop below the BMS recovery threshold — typically around 2.5V per cell. At that point the BMS enters a protective lockout state and will not respond to a normal charge attempt. To recover the pack, connect it to a charger that supports a low-current pre-charge or trickle mode and leave it for 30–60 minutes before attempting a full charge cycle. If cell voltage has dropped below 2.0V per cell, the pack should be replaced rather than recovered.
CT 2013 shuts down instantly when the probe module initialises
Probe and sensor modules draw a sharp inrush current at power-up — often 2–3× the steady-state draw — that lasts only milliseconds but is enough to trip a weakened or cold BMS. A new pack can also trigger this if the BMS has not completed its initialisation handshake with the instrument. Fit the battery, power on the CT 2013 without the probe attached, let it reach the main menu, then connect the probe. This sequence lets the BMS settle at operating voltage before the probe inrush hits. If shutdowns persist after this step, check that the battery contact pins on the instrument are clean and making full contact.