About this replacement
Siemens CF110 — 3.7V Li-ion Replacement Battery (EBA-180)
This is a 3.7V 600mAh Li-ion battery for the Siemens CF110 mobile phone. It replaces OEM part numbers EBA-180 and EBA-190. The cell matches the original voltage rail and connector, so it slots directly into a CF110 handset without modification.
- CF110 compatibility: The CF110 uses a compact 3.7V single-cell architecture. Both the EBA-180 and EBA-190 share the same connector pinout and BMS handshake on this platform, so either OEM number points to the same physical cell format and charge profile.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the CF110 platform. The BMS accepted the charge current without flagging an incompatibility error, and the protection circuit triggered correctly at low-voltage cutoff rather than allowing an uncontrolled deep discharge.
- Fuel gauge recalibration on the CF110: After fitting a new cell, run one full discharge to auto-shutoff followed by a full charge before re-enabling any fast-charge option. This gives the CF110's fuel gauge IC one complete cycle to map the new cell's discharge curve — skipping this step is the main cause of erratic percentage readings in the first week.
Sudden shutdown at 20–30% on the CF110 after a cell swap
The CF110's fuel gauge IC stores a learned discharge curve from the previous cell. When a new cell goes in, the stored curve no longer matches the actual voltage-versus-capacity profile. Under load — an active call or screen-on burst — the phone's processor draws enough current to cause a brief voltage sag. If the gauge IC thinks 20% remains but the real cell voltage drops below the cutoff threshold under that load, the phone shuts down. One full discharge-to-shutoff cycle followed by a full uninterrupted charge resets the coulomb counter and eliminates this behaviour.
CF110 reporting a fixed percentage for several minutes before jumping
This is the fuel gauge IC interpolating from a stale discharge curve stored in flash. The counter has no reliable reference points for the new cell, so it holds a value until voltage change forces a correction — producing the visible jump. It is not a fault with the cell itself. Complete two full discharge-charge cycles without interruption and the gauge will anchor to accurate voltage reference points, after which the percentage steps smoothly. After the second cycle, check that the phone reads below 3.80V at the point it reports 100% charged — if it reads higher, the gauge is still recalibrating.