Logitech K830 Replacement Battery 3.7V 1100mAh Li-Polymer

Logitech Illuminated Living-Room Keyboard K830 — 3.7V Li-Polymer Replacement Battery (533-000112)

This is a 3.7V, 1100mAh Li-Polymer battery for the Logitech K830 Illuminated Living-Room Keyboard. It replaces OEM part 533-000112 and fits the K830 directly. The K830 draws power continuously for backlighting and wireless connectivity, which accelerates capacity fade in the original cell over time.

• K830 platform fit: The K830 uses a single flat Li-Polymer cell at 3.7V nominal. The connector and PCB footprint match OEM spec at 50.52 x 33.44 x 6.63mm. No modification needed — the BMS on the keyboard manages charging and cutoff directly.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the K830 board. The BMS accepted the cell without error, balanced to full charge cleanly, and cutoff triggered correctly at low voltage. No thermal events were observed.
• Backlight management on the K830: The K830's backlight is the single largest drain on this battery. Running backlight at full brightness while connected via Bluetooth will deplete the cell significantly faster than low or zero backlight. Dim or disable the backlight when the keyboard is docked or near its charging cable to extend each charge cycle.

Why the K830 stops charging before reaching full capacity

The K830's onboard BMS monitors cell voltage and temperature during charge. If the replacement cell's internal resistance is slightly higher than the original — common in aged or off-spec cells — the BMS may terminate the charge cycle early, interpreting the voltage rise as a full-charge signal. This leaves the battery at 80–90% rather than 100%. A genuine 1100mAh Li-Polymer cell with low internal resistance resolves this. After fitting the new cell, run one full charge via USB before first use to let the BMS calibrate to the new cell's voltage curve.

K830 pairing lost after battery swap

Removing the battery causes a full power loss to the K830's Bluetooth controller, which clears the active pairing state on some firmware versions. When this happens, the keyboard will not reconnect automatically — it appears online to the host but sends no input. Hold the Bluetooth pairing button on the underside of the K830 for three seconds to enter pairing mode, then reconnect via your host device's Bluetooth settings. Once re-paired, the connection is stable and persists through normal sleep cycles.