Sirius XM Lynx Compatible Battery 3.7V 1050mAh Li-ion

Sirius XM Lynx / SXi1 — 3.7V Li-ion Replacement Battery (SX-6900-0010)

This is a 3.7V, 1050mAh Li-ion replacement battery for the Sirius XM Lynx and SXi1 portable satellite radio receivers. It matches OEM part number SX-6900-0010 and fits directly into both models. Capacity figure is taken from product data — 3.89Wh.

• XM Lynx and SXi1 compatibility: Both the Lynx and SXi1 share the same battery bay, connector pinout, and BMS handshake protocol. A single cell swap covers either unit without any adapter or modification.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the XM Lynx. The BMS accepted the cell immediately, voltage held steady across the RF and display draw, and protection circuits tripped correctly at the low-voltage threshold.
• Station list recovery after swap: After installing this battery, let the XM Lynx complete a full auto-scan before manually selecting stations. The station list sits in volatile memory and is cleared on power loss — a fresh scan rebuilds it correctly rather than returning partial or blank station lists.

Radio cutting out mid-station at low battery on the XM Lynx

The XM Lynx DAB decoder needs a stable voltage supply to maintain the OFDM stream. When cell voltage sags under load — especially if the original battery has degraded — the decoder loses lock and the audio drops or stutters. This is not a reception problem; it is a voltage floor problem. A cell that reads 3.5V at rest can still sag below the decoder's minimum threshold under the combined draw of RF circuitry and display backlight.

Reception worse than expected after fitting a new battery

Weak satellite signal areas force the XM Lynx to push its RF front end harder, which draws more current. If the replacement cell has been stored long enough to self-discharge significantly, it may not deliver full RF output voltage even though the indicator shows charge remaining. Check resting voltage — it should read at or above 3.7V before first use. If it reads below 3.6V, run a full charge cycle before judging reception quality.