Landi A8 Payment Terminal Replacement Battery 7.4V 2600mAh

Landi A8 / E350 / E550 — 7.4V Li-ion Replacement Battery (LD18650D)

This 7.4V 2600mAh Li-ion battery replaces the original power cell in the Landi A8, E350, and E550 portable payment terminals. These are countertop and handheld POS devices used in retail and hospitality for card and mobile payment processing. The OEM part numbers covered are LD18650D and LD18650A.

• A8, E350, and E550 compatibility: All three terminals run on the same 7.4V two-cell Li-ion architecture with a shared connector pinout and BMS handshake protocol. Swapping between models on this voltage rail requires no hardware modification.
• Bench tested on actual hardware: We ran this cell through a full charge and discharge cycle on the A8 platform. The BMS accepted the handshake without fault codes, and the protection circuit triggered correctly at the low-voltage cutoff threshold during discharge testing.
• First transaction cycle after installation: After fitting the battery, complete one full transaction cycle — including a receipt print — before deploying in a live environment. The terminal maps battery capacity during normal operation and requires at least one complete power cycle to calibrate the charge indicator accurately.

Terminal rebooting mid-transaction after battery swap

The receipt printer motor draws a sharp current spike at the moment of printing — sometimes 1.5A or more for a fraction of a second. On a new cell that has not yet completed a full charge cycle, the BMS may read this spike as an overcurrent event and trip the protection circuit, cutting power momentarily. This causes the terminal to reboot mid-sale. Running one complete charge-discharge cycle before going live allows the BMS to set its baseline and tolerate normal print spikes without tripping.

Terminal not powering on after sitting unused in a drawer

Li-ion cells self-discharge at roughly 2–3% per month. If the terminal sat unused for several months, the cell voltage may have dropped below the BMS recovery threshold — typically around 2.5V per cell, or 5.0V at the pack level. At that point the BMS locks out the discharge path entirely to prevent cell damage. Connect the terminal to its original charger and leave it for at least 60 minutes without interruption; most chargers include a trickle pre-charge stage that slowly raises cell voltage back above the recovery threshold before switching to normal charge current. If the terminal still shows no response after that period, check charger output with a multimeter — target 8.4V at the charging port.