Rii mini i24 Replacement Battery 3.7V 650mAh Li-Polymer

Rii mini i24 / i24T / RT-MWK24T — 3.7V Li-Polymer Replacement Battery (1507-030408)

This 3.7V 650mAh lithium-polymer battery replaces the internal cell in the Rii mini i24, i24T, and RT-MWK24T wireless keyboard. It matches the original dimensions at 52.30 x 33.53 x 3.90mm, so it seats correctly in the keyboard cavity without modification. When the stock battery swells or holds no charge, this is the direct swap.

• Rii mini i24 series fit: The i24, i24T, and RT-MWK24T share the same internal battery bay, connector orientation, and 3.7V supply rail. All three accept this cell without adapter wiring or connector rework.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the i24 platform. The protection circuit held cutoff at the correct low-voltage threshold and accepted charge from the keyboard's onboard charging circuit without fault flags.
• Connector orientation on reassembly: The i24 series routes the battery connector along the left side of the PCB. Reverse-seating the connector will trigger the protection circuit and the keyboard will not power on — confirm polarity before closing the housing.

Keyboard pairing lost after battery swap on the Rii i24

When the i24's battery drops to full depletion before replacement, the keyboard's volatile pairing memory loses its USB receiver link. This is not a fault with the new battery — it is a consequence of complete power loss to the onboard controller. After fitting the replacement cell, hold the pairing button on the keyboard for three seconds, then replug the USB nano-receiver to force a fresh handshake. The Rii i24T and RT-MWK24T follow the same re-pair sequence.

Keyboard input dropping characters at low battery voltage

As the Li-Polymer cell discharges toward 3.2V, the i24's wireless transmitter begins operating below its stable voltage window. The result is intermittent keystroke dropouts — characters appear missing or delayed on screen. This is not a USB receiver fault or driver issue. Charge the battery until the indicator shows full; dropouts stop once cell voltage returns above 3.6V.