Ricoh DB-90 GXR Compatible Battery 3.7V 1800mAh

Ricoh GXR / GXR-S10 / GXR-A12 — 3.7V Li-ion Replacement Battery (DB-90)

This is a 3.7V, 1800mAh lithium-ion replacement battery for the Ricoh GXR camera system. It fits the GXR body along with the GXR-S10 and GXR-A12 lens-unit configurations. Slot it into the same battery compartment as the original DB-90 — same footprint at 49.60 × 35.20 × 10.80mm.

• GXR system compatibility: The GXR body powers whichever lens-camera unit is mounted — S10 or A12 — from a single shared battery. All three configurations draw from the same 3.7V rail through the same connector, so one DB-90 cell covers the full modular lineup.
• Bench tested on actual hardware: We ran this cell through the GXR body with both the S10 and A12 units attached. The BMS accepted the cell on the first charge cycle and reported charge status correctly on the camera display without requiring a manual reset.
• First-charge protocol on the GXR body: Charge this cell fully inside the camera body or OEM charger before your first shoot. The GXR's battery-remaining display calibrates to the new cell's discharge curve during that initial cycle — skipping it can cause the indicator to drop suddenly at around 50%.

Why the GXR battery percentage drops sharply mid-shoot after a lens unit swap

The GXR body re-reads the battery state each time a lens-camera unit is detached and reattached. If the cell is partially discharged when you swap units, the body samples open-circuit voltage at a point on the discharge curve where small voltage changes correspond to large state-of-charge shifts. This makes the indicator jump — often 20% or more — in a single reading. It is not cell failure. The reading stabilises once the new unit draws current and the BMS refreshes its calculation under load.

GXR showing dead battery icon immediately after inserting a new replacement cell

A replacement cell shipped in storage mode can sit below the GXR body's minimum acceptance voltage — typically under 3.0V — causing the camera to display a dead battery indicator before powering on. Remove the cell and place it in an OEM or compatible standalone charger for 15–20 minutes to bring it above the 3.0V threshold. Once the charger shows activity, reinsert the cell into the camera body and complete a full charge cycle there. The body should recognise the cell and display a normal charge level after this step.