About this replacement
EXFO EX10 10G Ethernet Tester — 3.7V Li-Polymer Replacement Battery (01WQ0037-19)
This 3.7V, 12000mAh Li-Polymer battery replaces the OEM pack in the EXFO EX10 10G Ethernet Tester. It fits the EX10 platform directly, restoring full portable operation for field installation, troubleshooting, and maintenance work on high-speed Ethernet networks. Voltage and capacity match the original spec: 3.7V, 12000mAh (44.4Wh).
- EX10 10G Ethernet Tester fit: The EX10 uses a single large-format Li-Polymer cell pack with a dedicated BMS that monitors cell voltage and current draw across active test ports. This battery matches the physical footprint (132.90 × 67.50 × 9.70mm), connector pinout, and communication protocol the EX10's power management circuit expects.
- Bench tested on actual hardware: We ran this pack through power-up sequencing and sustained test-port activation on the EX10 platform. The BMS held stable across multi-port initialisation without triggering an overcurrent fault, and cell voltage remained consistent under the combined load of active RF and data processing tasks.
- First-deployment calibration step: After installing this pack, run a full calibration cycle through the EX10 instrument menu before field deployment. The instrument maps battery state during calibration — skipping this step causes premature low-battery warnings during the first live measurement session.
BMS lockout after the EX10 sat unused in a carry case for months
Li-Polymer cells self-discharge slowly in storage. If the EX10 was shelved with a partially depleted pack, the cell voltage can drop below the BMS recovery threshold — typically around 2.5V per cell — and the protection circuit latches off entirely. At that point, the instrument will not power on and the charger may show no activity. To recover, connect the EX10 to the OEM charger and leave it for 30–60 minutes without pressing the power button — the charger trickle-charges the cell back above the BMS re-initialisation threshold before normal charging begins.
EX10 shuts down mid-test when transferring logs to a PC via USB
USB data transfer adds a separate current draw on top of active test-port processing — on a degraded or partially charged pack, the combined load pulls cell voltage below the BMS cutoff threshold. The BMS trips to protect the cell and the instrument cuts out, often mid-transfer. This is not a firmware fault. Charge the pack to at least 3.9V per cell before starting a USB session, or transfer logs immediately after a full charge cycle before running further tests.