RTI Pro 41-500012-13 Replacement Battery 3.7V 1200mAh

RTI Pro Series — 3.7V Li-ion Replacement Battery (41-500012-13)

This is a 3.7V, 1200mAh Li-ion replacement battery for the RTI Pro, Pro24.i, Pro24.r, and Pro24.r v2 wireless home automation remotes. It slots directly into the battery compartment and restores full IR output to the remote. Voltage and physical dimensions match the original cell exactly at 53.00 × 33.90 × 5.70mm.

• Pro and Pro24 series compatibility: The Pro, Pro24.i, Pro24.r, and Pro24.r v2 all share the same battery bay dimensions and 3.7V single-cell power rail. One SKU covers all four variants — no adapters or modifications needed.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on RTI Pro hardware. The battery accepted a full charge without interruption and delivered consistent IR trigger voltage across the entire discharge range.
• Single-cell remote swap tip: This remote runs on one Li-ion cell, so there is no pairing issue — but confirm polarity before closing the compartment. The positive terminal faces toward the contact marked with a plus sign. A backwards install will leave the remote completely unresponsive and is the most common cause of a failed swap.

Why the RTI Pro stops responding mid-session even with a charged battery

Li-ion cells develop internal resistance as they age. When that resistance rises high enough, the cell can no longer sustain the brief current spike the IR LED needs to fire a command. The voltage at rest may still read 3.6V on a meter, but under load it dips below the minimum IR trigger threshold. Replacing the cell restores the current delivery the LED requires rather than just topping up voltage.

RTI Pro commands registering only when held close to the receiver

IR range collapses before battery percentage drops to zero. As the cell discharges below roughly 3.5V, the IR LED pulse weakens and the beam narrows. The remote still functions at close range because the receiver sensor picks up the weaker signal directly. Install a fresh cell and test from normal operating distance — full IR range returns when resting voltage sits at or above 3.7V.