Samsung BP-90A Camcorder Replacement Battery 3.7V 800mAh

Samsung HMX-E10WP Series — 3.7V Li-ion Replacement Battery (BP-90A)

This is a 3.7V, 800mAh Li-ion cell built to the BP-90A specification. It fits the Samsung HMX-E10WP, HMX-E10BP, HMX-E100P, and HMX-E10 compact camcorders. The BP-90A form factor is slim — 49.50 x 34.05 x 4.90mm — and slots directly into the battery compartment on these pocket camcorders.

• HMX-E10 series fit: These camcorder models share the same battery bay dimensions, 3.7V rail, and BP-90A connector pinout. The BMS communication protocol is identical across the HMX-E10WP, HMX-E10BP, HMX-E100P, and HMX-E10 variants, so one cell covers the full family.
• Bench tested on actual hardware: We ran charge and discharge cycles through a Samsung HMX-E10 body. The BMS accepted the cell without error, reported charge state correctly, and held the cutoff voltage within the expected range at end of discharge.
• First-use charge cycle on the HMX-E10WP: Insert the new cell and charge it fully inside the camera body before your first recording session. Some Samsung camcorder BMS firmware maps battery-remaining percentage to an internal reference that calibrates on the first in-body charge — skipping this step can cause the indicator to read inaccurately throughout the cell's life.

Why the HMX-E10WP shows a dead battery indicator on a freshly charged replacement cell

The HMX-E10WP reads battery level by mapping the cell's discharge curve against a stored voltage threshold table. A new cell that hasn't completed an in-body charge cycle can present a resting voltage the firmware doesn't recognise as "full." The camera interprets this as a depleted or missing cell and shows the low-battery icon even though the cell holds a full charge. One complete charge cycle from inside the camera body resets this — after that, the indicator tracks accurately.

Battery percentage jumping erratically on the HMX-E10WP display mid-recording

This happens when the camera's voltage-to-percentage mapping doesn't align with the new cell's discharge curve during the first few cycles. The firmware is reading real voltage correctly, but translating it against a reference calibrated to the original cell. The percentage can jump from 60% to 20% without warning. Run two full charge-discharge cycles through the camera body — after that, the indicator stabilises because the BMS has enough discharge history to recalibrate its threshold mapping.