SciAps Z-200 XRF Analyzer 14.4V Li-ion Replacement Battery

SciAps Z-200 / Z-500 XRF Analyzer — 14.4V Li-ion Replacement Battery

This is a 14.4V, 3400mAh (48.96Wh) Li-ion replacement battery for the SciAps Z-200 and Z-500 handheld XRF analyzers. Both instruments use the same voltage rail and battery form factor, making this cell a direct fit for either unit. The Z-200 and Z-500 are non-destructive elemental analysis instruments used in field and clinical material testing.

• Z-200 and Z-500 shared battery platform: SciAps built both the Z-200 and Z-500 around the same 14.4V battery architecture. The connector, physical envelope, and BMS handshake protocol are identical across both models, so one cell covers either instrument.
• Bench tested on actual hardware: We ran this cell through charge and load cycles on XRF analyzer-class equipment. The BMS communicated state-of-charge correctly across all test cycles, and the protection circuit responded as expected under full instrument load.
• Post-swap self-test procedure: After installing this battery, allow the Z-200 or Z-500 to complete its full power-on self-test without interrupting the boot sequence. The instrument's BMS runs a verification routine at startup — cutting power during this phase logs a persistent battery fault that will not clear until the next complete reboot.

Device not completing boot sequence on a new battery

The Z-200 and Z-500 run a BMS handshake during startup that checks state-of-charge and cell voltage before allowing the instrument to reach the ready state. A new cell that shipped at storage charge — typically around 3.7V per cell — can sit just below the threshold the device expects for a confident boot. The instrument interprets this as a fault and halts the sequence. A single full charge before first use brings all cells to 4.2V and clears the condition on the next power cycle.

Low battery alarm triggering immediately after a confirmed full charge

This is a BMS calibration issue, not a cell defect. The Z-200's charge IC applies a conservative state-of-charge model during the first few cycles, and the instrument's low-battery threshold is tuned to the OEM cell's discharge curve. A replacement cell with a slightly different internal resistance reads lower on that curve in the early cycles. Run one complete charge-discharge-charge cycle under normal instrument load, and the BMS recalibrates its capacity estimate. After that cycle, the alarm threshold tracks correctly against actual remaining charge.