O2 JADE160 XDA Guide Replacement Battery 3.7V 2200mAh

O2 XDA Guide — 3.7V Li-ion Replacement Battery (JADE160)

This is a 3.7V, 2200mAh lithium-ion battery for the O2 XDA Guide Windows Mobile PDA phone. It replaces OEM part numbers JADE160, 35H00118-00M, and BA S330. If your XDA Guide shuts down early, charges slowly, or no longer holds a useful charge, the original cell has likely degraded past the point where conditioning helps.

• XDA Guide compatibility: The XDA Guide uses a single-cell Li-ion pack at 3.7V nominal with a standard contact layout. This replacement matches that voltage rail and connector position, so no wiring modification is needed. The BMS handshake is handled by the device's charge IC, not the pack itself.
• Bench tested on actual hardware: We ran this cell through charge, discharge, and modem-active load cycles. The BMS held protection thresholds correctly under screen-on and radio-active draw, and the charge IC accepted the pack without fault flags on both cold and warm insertion.
• Fuel gauge recalibration on first use: On first installation, run one full discharge to automatic cutoff followed by an uninterrupted charge to 100% before pulling the cable. The XDA Guide's fuel gauge IC was calibrated to the original cell's discharge curve — one complete cycle realigns it to the new cell so percentage readings are accurate from that point forward.

Sudden shutdown at 20–30% on the XDA Guide after a cell swap

This is a voltage cliff issue, not a capacity problem. The XDA Guide's modem and display together pull enough current that a fresh cell — whose discharge curve the fuel gauge hasn't yet mapped — can drop below the BMS cutoff voltage under load before the reported percentage reaches zero. The device shuts off because real cell voltage fell under load, even though the gauge said 25%. One full discharge-charge cycle lets the fuel gauge IC build an accurate model of the new cell's voltage-to-capacity curve, and the premature shutdowns stop.

XDA Guide not powering on after the battery sat in storage

If a battery has been stored discharged for weeks or months, the cell voltage can drop below 2.5V — the point where the BMS locks out to prevent damage. The XDA Guide will show no response on the power button because the BMS is blocking current flow entirely. Connect the device to a charger and leave it untouched for 20–30 minutes without pressing anything. Most BMS circuits include a trickle-recovery path that slowly raises cell voltage back above the 2.5V threshold, after which normal charging resumes and the device powers on again.