Panasonic DMW-BCJ13 Lumix DMC-LX5 Replacement Battery 3.7V 850mAh

Panasonic Lumix DMC-LX5 / LX7 — 3.7V Li-ion Replacement Battery (DMW-BCJ13)

This is a 3.7V, 850mAh lithium-ion replacement for the Panasonic DMW-BCJ13 battery. It fits the Lumix DMC-LX5, LX5K, LX5W, and LX7 compact cameras. Dimensions are 41.70 × 35.60 × 10.05mm — a direct physical match to the OEM cell.

• LX5 and LX7 platform fit: Both cameras run the same 3.7V battery rail and use the same DMW-BCJ13 form factor. The connector and BMS handshake are identical across LX5K and LX5W variants, so one part number covers the full range.
• Bench tested on actual hardware: We cycled this cell through the LX7 body using an OEM charger. The BMS accepted the cell without flags, state-of-charge reporting stabilised after one full charge cycle, and the protection circuit tripped correctly at low-voltage cutoff.
• First-use charge protocol for the LX5/LX7: Charge the new cell inside the camera body or via the OEM DMW-BTC10 charger before your first shoot. The Lumix BMS maps the discharge curve during that first full cycle — skipping it can cause the battery-remaining indicator to read inaccurately for several sessions.

Why the LX5 battery-remaining display reads erratically on a new cell

The Lumix DMC-LX5 uses a voltage-threshold system to estimate remaining charge. A new cell has a slightly different discharge curve than an aged OEM cell — the camera's thresholds don't map cleanly to it until the BMS has seen a complete charge-discharge cycle. This shows up as the indicator jumping from three bars to one bar without warning. Run one full charge and full discharge cycle before trusting the display. After that cycle, readings settle to within one bar of accurate across the normal operating range.

Camera body shows "No Battery" with a freshly inserted replacement cell

This happens when the replacement cell's resting voltage is just below the LX5's minimum wake threshold — typically below 3.2V after storage. The camera interprets this as an absent or dead cell rather than a low one. Remove the battery, charge it externally for 15–20 minutes via the OEM charger to bring it above 3.4V, then reinsert. At that point the body recognises the cell and the charge indicator appears normally.