Logitech MX Keys Mini 533-000200 Replacement Battery 3.7V

Logitech MX Keys Mini — 3.7V Li-Polymer Replacement Battery (533-000200)

This is a 3.7V, 1050mAh Li-Polymer battery for the Logitech MX Keys Mini wireless keyboard (model YR0084, 920-010514). It replaces OEM part 533-000200 directly. The MX Keys Mini is a compact backlit keyboard with multi-device Bluetooth pairing, and this battery restores full wireless functionality when the original cell degrades.

• MX Keys Mini platform fit: The YR0084 and 920-010514 variants share the same 3.7V power rail, connector pinout, and BMS handshake as the original 533-000200 cell. The internal BMS communicates charge state to the keyboard firmware, so a matching voltage and capacity spec is required for the charge indicator to read accurately.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the MX Keys Mini. The BMS accepted the cell without fault flags, the backlight charging LED cycled correctly, and the keyboard reconnected to all three paired Bluetooth devices after the swap.
• Backlight management after replacement: The MX Keys Mini backlighting is the single largest draw on this battery. After fitting a new cell, set backlight brightness to auto or low in Logi Options+ — leaving it at full brightness permanently will accelerate capacity fade on any Li-Polymer cell, including this one.

Keyboard pairing lost after battery swap

A full power loss — which happens when the old battery is removed — clears the active Bluetooth session on some MX Keys Mini units. The keyboard does not always reconnect automatically. Hold the Bluetooth channel button for three seconds to force re-pairing mode, then reconnect from your device's Bluetooth settings. If the keyboard shows as already paired on the host device, remove it from that device first, then re-pair fresh. Pairing is stored in the keyboard's flash memory, so this is a one-time step after replacement.

Charge indicator stuck at empty after fitting new battery

This happens when the BMS on the new cell initialises at a low state-of-charge from storage and the keyboard firmware reads it as depleted. Plug in via USB-C and allow the battery to charge for at least 30 minutes before checking the indicator in Logi Options+. If the indicator still shows empty after a full charge cycle, check that the connector is fully seated — a partial connection can prevent the BMS from communicating charge state to the keyboard. A correctly seated cell should register above 4.0V at full charge.