HumanWare New Stream Replacement Battery 3.8V 2500mAh

HumanWare New Stream — 3.8V Li-Polymer Replacement Battery (BAPP-0006)

This 3.8V, 2500mAh Li-Polymer battery replaces the OEM BAPP-0006 pack in the HumanWare New Stream portable notetaker. The New Stream is an assistive technology device used daily by blind and visually impaired users to access information, manage tasks, and navigate digital content. Capacity is 9.5Wh — identical to the original specification.

• New Stream platform fit: The New Stream uses a single-cell Li-Polymer pack with a proprietary connector and BMS handshake tied to the device's power management controller. This replacement matches the original cell configuration, connector pinout, and BMS communication protocol so the device recognises the pack at first boot.
• Bench tested on actual hardware: We cycled this pack through the New Stream's charge and wake sequences. The BMS negotiated correctly with the device's power controller, held stable voltage under sustained audio and screen-refresh load, and triggered the correct low-voltage cutoff without locking the device into an error state.
• First-use initialisation on the New Stream: After fitting this pack, charge to 100% before switching the device on. The New Stream calibrates its battery percentage indicator against the cell's full-charge voltage on the first power-up cycle — starting from a partial charge causes the indicator to report inaccurate levels for several subsequent cycles.

BMS lockout after the New Stream sat unused in a carry case for months

Li-Polymer cells self-discharge slowly in storage. If a New Stream sits unused long enough, the pack drops below the BMS recovery threshold — typically around 2.5V per cell — and the protection circuit opens to prevent damage. At that point, the device will not power on and may not respond to a standard charger. Connecting the OEM charger for 15–30 minutes at a low-current top-up is usually enough to bring the cell voltage above the BMS re-enable threshold. Once the BMS closes the circuit, normal charging resumes and the pack recovers to full capacity.

New Stream powers on but shuts off during USB data transfer to a PC

USB data transfer draws current from both the processor and the USB controller simultaneously — a combined load the device's power rail doesn't sustain well on a degraded or partially charged cell. The BMS sees a voltage sag below its cutoff threshold and disconnects the pack to protect the cell. This is not a fault in the replacement pack — it is the BMS responding to genuine undervoltage under peak draw. Charge the New Stream to at least 80% before initiating a USB transfer session, and confirm charge voltage is at or above 4.1V before connecting to a PC.