Pliant MicroCom M 900MHz Compatible Battery BT-11 3.7V 1100mAh

Pliant MicroCom M 900MHz — 3.7V Li-ion Replacement Battery (BT-11)

This is a 3.7V, 1100mAh Li-ion cell built to the BT-11 spec for the Pliant MicroCom M 900MHz and MicroCom M Beltpacks. It slots into the same cavity as the original and connects to the same BMS circuit. When the stock cell stops holding charge, this restores cordless operation at the original voltage and capacity.

• MicroCom M and Beltpack compatibility: Both the 900MHz speaker and the Beltpack variants share the BT-11 footprint and the same 3.7V single-cell architecture. The connector pinout and cell dimensions — 53 × 34 × 5mm — are identical across the range, so one part number covers both.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on a MicroCom M unit. The onboard BMS accepted the cell without fault flags, balanced correctly at 4.2V, and cut off cleanly at the low-voltage threshold without triggering an error state.
• Monthly discharge cycle for MicroCom M users: If the speaker sits on a desk and gets topped off constantly, run it below 20% at least once a month before recharging. Constant top-off charging without a full discharge causes fuel gauge drift on this cell, making the battery indicator unreliable.

Audio distorting before the battery indicator reaches empty on the MicroCom M

This happens when cell voltage sags under the combined draw of the amplifier and the 900MHz radio module. At high playback levels, instantaneous current demand spikes beyond what a degraded or partially discharged cell can deliver cleanly. The amplifier clips before the battery gauge registers critical — so the indicator still shows one or two bars when audio breaks up. A fresh cell with full capacity handles the peak draw without voltage sag, which eliminates the distortion at normal playback levels.

MicroCom M not waking from USB charge after sitting unused for weeks

A cell left discharged for several weeks can drop below the USB-C PD minimum acceptance voltage — typically around 2.5V for Li-ion. At that point, the charger handshake fails and the device appears completely dead. Connect it to a USB port and leave it for 20–30 minutes without expecting any response — the BMS needs time to trickle charge the cell back above the threshold before normal charging resumes. If voltage does not recover above 3.0V after 30 minutes, the original cell has failed and replacement is the only fix.