QED Environmental Systems 7.2V Replacement Battery 2011113

QED Environmental Systems — 7.2V Ni-MH Replacement Battery (2011113)

This 7.2V 3800mAh Ni-MH battery replaces the OEM pack in QED Environmental Systems portable field instruments. It matches the original form factor and connector on units using part number 2011113. Capacity is sourced from cell-level data, not estimated from the original label.

• QED Environmental Systems instrument fit: These instruments share a common 7.2V rail and battery bay spec across the platform. The connector keying, cell count, and BMS voltage thresholds match the original pack, so the instrument recognises the new battery without firmware complaints or charge-cycle errors.
• Bench tested on actual hardware: We cycled this pack through charge-discharge runs with a probe load attached. The BMS held regulation through sensor initialisation spikes and sustained logging draws without tripping into protection mode.
• First-use calibration tip: After installing, run a full calibration cycle through the instrument menu before field deployment. The instrument maps battery state during calibration. Skipping this step causes premature low-battery warnings on the first measurement session, even with a fully charged pack.

BMS lockout after a QED instrument sits unused in a carry case for months

Ni-MH cells self-discharge at roughly 20–30% per month under ambient storage. A pack left unused for three or more months can drop below the BMS recovery threshold — typically around 5.4V on a 7.2V six-cell pack. When voltage falls below that floor, the BMS enters sleep mode and the instrument sees no pack at all, not a flat one. Standard chargers may not wake a sleeping BMS because they expect a minimum response voltage before initiating the charge cycle. Connect the pack to a Ni-MH charger that supports a recovery or wake pulse, allow it to bring the pack above 6.0V, then transfer to your normal instrument charger to complete the charge.

Instrument readings drift or reset mid-logging session

Sustained sensor load — particularly when multiple probe channels are active simultaneously — draws more current than standby operation. If internal cell resistance has risen due to age or storage, voltage can sag under that load even when the displayed battery indicator looks adequate. The instrument's processor detects the voltage dropout and either resets or flags a measurement error to protect data integrity. Check cell resistance with a battery analyser; if internal resistance reads above 200mΩ per cell on a 7.2V pack, the cells cannot hold voltage under load and the pack needs replacement rather than recharging.