RCA F8011A Cordless Phone Compatible Battery 3.7V 500mAh

RCA F8011A / F8021A / F8031A / F8041A — 3.7V Li-Polymer Replacement Battery (CPP-519Z3)

This is a 3.7V, 500mAh lithium-polymer battery for the RCA F8011A, F8021A, F8031A, and F8041A cordless phone handsets. It replaces OEM part CPP-519Z3. All four models share the same handset platform, battery bay dimensions, and connector — one battery covers the entire series.

• F8011A–F8041A series fit: These four handsets run off the same PCB layout and battery connector. The cell footprint is 33.30 × 27.20 × 7.70mm — identical across all variants. No adapter or modification needed.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the F8031A handset. The BMS accepted charge from the base station cradle immediately, with no fault flags on the charge indicator.
• First-charge protocol for Li-Polymer handsets: After installing this battery, seat the handset in the base and leave it there for a full charge cycle before first use. Li-Polymer cells in low-draw handsets come from storage at a partial state of charge — skipping this step will leave measured capacity short of the 500mAh rating on the first few uses.

Talk time shorter than the original battery after replacement

Li-Polymer cells shipped in storage are typically held at 30–50% charge to protect the chemistry during transit. When you install and use the battery immediately, the handset draws from a partially depleted cell — talk time will feel shorter than rated. Place the handset in the base for a complete charge cycle before first use. Capacity stabilises within the first two to three full cycles, and the 500mAh rating is reached consistently from cycle three onward.

Handset not pairing with the base after battery swap

Removing the original battery cuts all power to the handset's DECT module, which can erase the pairing registration stored in volatile memory. The handset powers back on but the base station no longer recognises it. To re-pair, press and hold the registration button on the base unit until the LED flashes, then initiate handset registration from the handset menu — the exact button sequence is printed on the base station label. This is a one-time step after any full battery removal.