Toast TG200 Compatible Battery 3.8V 5450mAh Li-ion

Toast TG200 — 3.8V Li-ion Replacement Battery (1ICP9/69/65)

This 3.8V, 5450mAh Li-ion cell replaces the internal battery in the Toast TG200 mobile payment terminal. It fits the TG200 directly, restoring cordless operation for tableside and counter transactions. Voltage and capacity match the original specification from Toast.

• TG200 platform fit: The TG200 uses a single-cell Li-ion pack at 3.8V nominal. This replacement matches that voltage rail and the BMS handshake the terminal firmware expects on boot — a mismatch there will stall the PCI startup sequence before the home screen loads.
• Bench tested on actual hardware: We cycled this cell through simulated transaction loads — display on, wireless active, receipt printer firing — and monitored BMS overcurrent response. The protection circuit handled the printer motor's current spike without tripping into cutoff.
• First deployment tip: After fitting this battery, run one complete transaction from payment prompt through receipt print before putting the terminal into live service. The TG200 maps charge capacity during normal operation, and the charge indicator will read inaccurately until that first full cycle completes.

Terminal not completing PCI boot sequence after battery swap

The TG200's PCI boot process includes a firmware check that queries the battery's BMS for a valid response before proceeding. A freshly installed cell that hasn't completed a charge cycle may return an out-of-range state-of-charge value, causing the terminal to stall or loop at the boot screen. This is a BMS initialisation issue, not a fault with the battery. Charge the terminal to full — 4.2V at the cell — then power cycle it, and the boot sequence will complete normally.

Battery indicator stuck at 99% and won't move

On a new Li-ion cell, the terminal's charge IC enters a top-off mode where it trickles current to bring the cell to exactly 4.2V. During this phase the display holds at 99% — sometimes for 20 to 40 minutes — before the IC confirms full charge and the indicator updates. This is normal charge controller behaviour, not a faulty battery or a stuck sensor. Let the terminal remain on charge without interruption until the indicator clears to 100%.