SkyGolf SkyCaddie SX550 Compatible Battery 3.8V 5000mAh

SkyGolf SkyCaddie SX550 — 3.8V Li-Polymer Replacement Battery (CXDHA 695776P)

This is a 3.8V 5000mAh Li-Polymer cell built to replace the original CXDHA 695776P battery in the SkyGolf SkyCaddie SX550 handheld GPS golf navigator. It powers the touchscreen display and GPS receiver through a full round of play. Capacity figures are taken directly from the product specification — 19Wh total energy.

• SkyCaddie SX550 fit: The SX550 uses a single flat Li-Polymer cell with a matching footprint of 75.20 × 57.10 × 7.00mm. The connector and cell geometry must match exactly — any dimensional mismatch puts pressure on the touchscreen assembly and can cause display damage.
• Bench tested on actual hardware: We cycled this cell through the SX550's GPS-active load profile. The BMS held 3.8V nominal cleanly through sustained GPS acquisition and display-on states, with no unexpected cutoffs at the protection threshold.
• Cold-start satellite acquisition after fitting: After fitting this cell, power the SX550 fully on outdoors and let it acquire a satellite fix before heading to the first tee. GPS performs a cold start after any full power interruption — first fix takes 5–10 minutes. Subsequent warm starts drop well under a minute once ephemeris data is cached.

GPS accuracy reduced at the low-battery threshold on the SX550

When the SX550 battery drops below a certain voltage, the device can reduce GPS receiver sensitivity to protect remaining power for a clean shutdown. This shows up as yardage readings that update slowly or satellite count dropping on the status screen. It is not a GPS signal problem — it is the device pulling back receiver power. Keeping the cell above 3.6V during a round avoids this behaviour entirely.

SX550 shuts off mid-round without any low-battery warning

A fresh replacement cell needs a full charge cycle before the SX550's battery indicator reads accurately. Until the device has calibrated its voltage-to-percentage mapping, the indicator can show two or three bars and then cut off abruptly when the BMS hits its undervoltage protection floor. Charge the new cell to 100% before the first use, then discharge it fully on a round. After one complete cycle, the shut-off warning will trigger at the correct level.