About this replacement
Sharp Zaurus SL-C1000 / SL-C3000 / SL-C3100 — 3.7V Li-ion Replacement Battery (EA-BL08)
The EA-BL08 is a 3.7V, 2000mAh lithium-ion cell for the Sharp Zaurus SL-C1000, SL-C3000, and SL-C3100 handheld PDAs. These clamshell pocket PCs share the same battery bay, connector pinout, and BMS handshake protocol across the three models. This replacement restores full power to aging units where the original cell has lost capacity or no longer holds a charge.
- SL-C1000, SL-C3000, and SL-C3100 compatibility: All three Zaurus models use the same 3.7V rail, physical bay dimensions, and four-pin connector with integrated thermistor — the BMS reads the same NTC resistance profile across every unit we have tested, so one cell covers the full trio.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on a Zaurus SL-C3100 and confirmed the BMS accepted the cell without error flags, the charge circuit reached full voltage cutoff correctly, and the SRAM backup rail stayed live throughout the transition.
- Sync before you swap: The Zaurus stores open files, application state, and unsaved data in volatile SRAM powered directly by the main battery. Remove the battery without first syncing to a host PC via USB or cradle and that data is gone. Run a full sync and confirm it completed before pulling the old cell.
Zaurus SL-C3000 not booting after battery installation
The SL-C3000 boot sequence checks the battery voltage before releasing the CPU from reset. A new cell that has self-discharged in storage can sit below the minimum threshold — typically around 3.0V — and the device will show nothing on screen or flash the LED once and stop. This is not a fault with the battery or the device. Connect to the AC adapter and allow the cell to charge for at least 30 minutes before attempting to power on. Once the voltage clears the boot threshold, the device starts normally.
Battery life noticeably shorter than expected during wireless sync sessions
The Zaurus wireless LAN card and the CF slot draw significantly more current than the CPU alone at idle — the radio can pull three to four times the standby draw when actively transmitting. If the replacement cell was not fully charged before use, this elevated draw accelerates voltage sag and the BMS may trip the low-voltage cutoff earlier than expected. Charge to full before any wireless session and check that the battery indicator reads maximum before starting a sync. A resting open-circuit voltage of 4.1V to 4.2V confirms a full charge on a healthy 3.7V Li-ion cell.