Yakumo Delta X 5BT GPS Compatible Battery 3.7V 1250mAh

Yakumo Delta X 5BT — 3.7V Li-ion Replacement Battery

This 3.7V 1250mAh (4.63Wh) lithium-ion cell replaces the original battery in the Yakumo Delta X 5BT portable GPS navigator. The Delta X 5BT is a handheld navigation unit used for vehicle routing and real-time positioning. Fit this battery when the original no longer holds charge or causes unexpected shutdowns during active navigation.

• Delta X 5BT cell match: The Delta X 5BT uses a single-cell 3.7V Li-ion pack with a low-current BMS suited to the GPS receiver and display load — not a high-drain tool cell. Voltage, physical dimensions (50.00 × 36.60 × 6.60mm), and connector orientation match the original bay.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge under GPS receiver plus display load. The BMS held cutoff voltage cleanly and did not trip early under the combined draw of active navigation.
• Cold-start satellite acquisition after fitting: After fitting this cell, power the unit on outdoors with a clear sky view. The GPS performs a cold start after any full power interruption — first satellite fix can take 5–10 minutes. Subsequent warm starts drop to under a minute once almanac data is restored.

GPS accuracy reduced when battery charge drops below 20%

Some GPS units, including compact navigators in this class, reduce receiver sensitivity at low battery to conserve power. This shows as position drift or a weaker satellite signal count on the status screen. The Delta X 5BT may report fewer satellites locked and show a wider accuracy radius. Keep the battery above 3.7V under load to maintain full receiver performance.

Device shuts off without a low-battery warning

This happens when the fuel gauge or voltage-threshold indicator is uncalibrated after fitting a new cell. The unit's internal counter still expects the old, degraded battery's discharge curve, so the visual warning never triggers before the BMS cutoff hits. Fix this by running one full discharge-to-shutdown cycle followed by a full uninterrupted charge. After that cycle, the indicator aligns to the new cell's curve and warning thresholds fire at the correct voltage — typically around 3.5V under load.