Honeywell Thor CV31 Replacement Battery 3.7V 3350mAh 1021AB01

Honeywell Thor CV31 — 3.7V Li-ion Replacement Battery (1021AB01)

This is a 3.7V Li-ion battery rated at 3350mAh (12.4Wh), built to fit the Honeywell Thor CV31 vehicle-mounted computer terminal. The CV31 is used in logistics, delivery, and field fleet operations where the terminal stays powered through ignition cycles and shift changes. This battery matches OEM part numbers 1021AB01, VE33-8020-A0, and 213-042-001.

• Thor CV31 vehicle terminal fit: The CV31 uses a dedicated hot-swap battery to bridge power during vehicle ignition cycles and docking transitions. The connector pinout and BMS handshake on this battery are specific to that hot-swap bay — it communicates charge state to the terminal's power management controller so the main unit stays alive during a 3–10 second ignition start gap.
• Bench tested on actual hardware: We ran this battery through the CV31's boot sequence and ignition-cycle simulation. The BMS held voltage through startup current spikes without tripping into protective cutoff, and the terminal recognised charge state correctly throughout the test.
• Hot-swap charge level before install: Fit this battery fully charged before swapping it into the hot-swap bay. The CV31 draws peak current during its boot sequence, and an undercharged hot-swap battery may not supply enough voltage to bridge that gap — causing the terminal to restart instead of staying live.

Why the Thor CV31 loses data during vehicle ignition start

When the vehicle engine cranks, the 12V or 24V vehicle supply drops momentarily — sometimes for 3–10 seconds. The CV31's hot-swap battery is supposed to carry the terminal through that gap. If the hot-swap battery is below roughly 3.4V, it cannot supply enough current for the terminal's active load during that window, and the terminal resets. A reset mid-transaction wipes any unsaved data in RAM. Keeping the hot-swap battery above 80% charge before each shift prevents this.

CV31 not booting when running on battery alone

The Thor CV31 has a minimum voltage threshold in its boot sequence — if battery voltage sits below approximately 3.2V, the terminal will not complete startup and may show a blank screen or loop at the splash screen. This usually happens with a deeply discharged battery that has been left unused for weeks. Connect the terminal to vehicle or dock power first to let the battery recover above the boot threshold, then attempt startup. Once the terminal boots, allow a full charge cycle before relying on battery-only operation again.