Yeacomm Z2000 Replacement Battery 7.4V 3350mAh Li-ion

Yeacomm M60 / S10 / S11 / S12 Series — 7.4V Li-ion Replacement Battery (Z2000)

This is a 7.4V 3350mAh Li-ion replacement battery for the Yeacomm M60, S10, S11, and S12 portable cable modems. It slots into the battery bay on these devices and provides backup power when mains supply drops. The OEM part number is Z2000.

• M60 / S10 / S11 / S12 compatibility: These four models share the same battery form factor, voltage rail, and connector pinout. The Z2000 part number covers all of them because the modem firmware reads the same BMS handshake across the series.
• Bench tested on actual hardware: We ran this cell through charge cycles on the M60 and monitored BMS communication with the modem firmware. The battery registers correctly and the modem transitions to backup power without tripping a fault state.
• First-use charge requirement: After installation, leave the modem plugged into mains power for at least four hours before testing backup function. The modem firmware will not commission the battery for emergency use until it completes its initial charge acceptance sequence — skipping this step is the leading cause of failed backup tests post-swap.

Modem showing battery error light after swapping the Z2000

A battery fault indicator immediately after installation is not a sign of a defective cell. Yeacomm firmware runs a charge-state verification routine when it detects a new battery and will hold a fault flag until the cell reaches a threshold voltage — typically around 8.2V at full charge. This process can take up to 24 hours on the first cycle. Do not pull the battery or reset the modem during this window; let the charge cycle complete and the error will clear on its own.

VoIP calls dropping during a power outage while data stays up

Cable modems like the M60 prioritise DOCSIS data when battery current is limited. VoIP requires a sustained higher power draw than basic data throughput, so if the battery cell is partially depleted or still in its initial charge cycle, the modem will shed VoIP load first. Check that the battery has completed a full charge cycle before the next outage test. If VoIP still drops after a confirmed full charge, measure the battery terminal voltage under load — it should hold above 6.8V; anything below that points to cell degradation.