About this replacement
Newland N900 / SP600 — 7.4V Li-ion Replacement Battery (BL74V20L)
This 7.4V 2000mAh Li-ion battery replaces the OEM BL74V20L cell in the Newland N900 and SP600 mobile payment terminals. It restores full operating voltage to the portable POS unit used in retail and hospitality card-payment workflows. Capacity figures are sourced from the original cell specification — 14.8Wh total energy.
- N900 and SP600 shared battery platform: Both terminals run from the same 7.4V two-cell pack with identical connector pinout and BMS communication line. The charge IC in each device expects the same handshake protocol, so one cell fits both without modification.
- Bench tested on actual hardware: We cycled this cell through a full charge and discharge on an N900 unit. The BMS accepted the pack on first boot, the protection circuit tripped correctly at the low-voltage cutoff threshold, and the charge indicator tracked normally through all states.
- First-deployment calibration: After fitting the battery, run at least one complete transaction — including a printed receipt — before deploying the terminal in a live environment. The N900 maps battery capacity during normal operation and needs one full power cycle to align the charge indicator with the new cell's actual state of charge.
Terminal rebooting mid-transaction after battery swap
The N900's receipt printer motor pulls a short current spike — typically 800mA to 1A — at the moment it feeds paper. On a new cell that hasn't completed a full charge cycle, the BMS can read that spike as an overcurrent event and trip the protection circuit, cutting power to the terminal mid-sale. This is a BMS calibration issue, not a faulty battery. Charge the pack to 100%, complete one full transaction with a printed receipt, and the BMS will update its overcurrent baseline. Reboots during printing should stop after that first cycle.
Device won't power on after sitting unused in storage
Li-ion cells self-discharge at roughly 1–3% per month at room temperature. An N900 left unused for several months can arrive with a cell voltage below the BMS recovery threshold — typically around 2.5V per cell, or 5.0V total pack voltage. At that level, the BMS locks out the discharge path and the terminal shows no signs of life. Connect the original charger and leave it for 30–60 minutes without pressing the power button — the charge IC runs a trickle pre-charge mode to bring the cell back above the recovery threshold. Once pack voltage reaches approximately 6.0V, the BMS re-enables and the terminal will boot normally.