E-Plus Pocket PDA Replacement Battery 3.7V 2800mAh WIZA16

E-Plus Pocket PDA — 3.7V Li-ion Replacement Battery (WIZA16)

This 3.7V Li-ion battery replaces the original WIZA16 cell in the E-Plus Pocket PDA. Capacity is 2800mAh (10.36Wh). It restores power to the handheld PDA used for contacts, scheduling, and information management when the original cell has degraded or failed.

• Pocket PDA platform fit: The WIZA16 part number ties this cell to the Pocket PDA's specific connector footprint and BMS handshake. The 3.7V nominal rail matches the device's power management IC directly — no voltage conversion in the chain.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a Pocket PDA unit. The BMS accepted the cell without fault codes, and the charge IC reached full termination current correctly without tripping overvoltage protection.
• Fuel gauge recalibration on first use: On first use after installation, disable any fast-charge accessory and run one full discharge-to-charge cycle. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging pushes load into an uncalibrated state.

Sudden shutdown at 20–30% on the Pocket PDA after a cell swap

This happens when the fuel gauge IC is still calibrated to the old cell's discharge curve. The new cell hits a voltage cliff under load — typically when the CPU ramps up or the backlight peaks — and the BMS cuts output before the percentage reaches zero. The device reads 25% but the cell voltage has already dropped below the safe threshold under that load spike. One full discharge cycle from 100% to automatic shutdown, followed by a full charge, resets the coulomb counter to the new cell's actual curve.

E-Plus Pocket PDA not powering on after sitting in storage

Li-ion cells self-discharge in storage. If the Pocket PDA sat unused for several months, the cell voltage may have dropped below 2.5V per cell — the threshold where most BMS circuits lock out to prevent damage. Standard charging will not wake a locked-out BMS. Connect the device to its original charger and leave it for 15–30 minutes without attempting to power it on — the charge IC uses a low-current recovery trickle below 3.0V to bring the cell back above the BMS unlock threshold before normal charging resumes.