Panasonic Battery BR-CCF2TH BRCCF2TH

BR-CCF2TH | Panasonic 6V 5Ah Lithium Battery — 2-Cell C-Size / FANUC Alpha ABS Servo Backup / Brown JAE Connector

C-Size Lithium Pack for High-Capacity Servo Backup

The BR-CCF2TH is Panasonic's twin C-size lithium battery for FANUC Alpha servo amplifier ABS (Absolute Positioning System) backup — the highest-capacity variant in the FANUC Alpha absolute encoder battery range. Two Panasonic C-size BR cells in series produce 6V at 5000mAh — a substantially larger energy reserve than the smaller 2/3A or A-size packs used in other FANUC servo systems.

The FANUC Alpha servo system requires the C-size pack's higher capacity to maintain the ABS encoder position data through extended machine downtime periods — prolonged plant shutdowns, extended weekends, or maintenance periods where the CNC may be unpowered for weeks or months.

Key Specifications

FANUC Alpha ABS — What BR-CCF2TH Protects

The FANUC Alpha servo system's absolute positioning circuit (ABS) maintains axis position data continuously — including while the CNC power supply is off. The BR-CCF2TH supplies the encoder's position counter and memory with the 6V standby current needed to maintain this absolute position data through power-off periods.

Without battery: On the next power-up, the CNC cannot read absolute position from the encoder — a reference (homing) run is required before any axis motion is permitted. For multi-axis machines, this adds significant time to every power-on sequence.

With BR-CCF2TH: Absolute position is retained through power-off periods as long as the battery remains charged — the CNC reads current axis position directly on power-up, no homing required.

Application Scenarios

Alpha servo ABS battery alarm: A FANUC CNC's Alpha servo axis displays an ABS battery alarm. The BR-CCF2TH (A98L-0001-0902) is replaced during planned maintenance — absolute encoder positions retained on all axes, homing run eliminated at restart.

Extended plant shutdown preparation: Before a three-week facility-wide shutdown, maintenance checks BR-CCF2TH battery condition across all Alpha servo amplifiers — ensuring no ABS battery depletion during the extended power-off period.

FAQ

Q1: What FANUC alarm indicates BR-CCF2TH needs replacement on an Alpha servo?

The CNC generates an ABS-related battery alarm (typically alarm 9F for Alpha series, or a system alarm indicating battery voltage low on the affected axis) — appearing at power-on when voltage drops below the detection threshold. Replace at the alarm to avoid losing absolute encoder positions.

Q2: Can BR-CCF2TH be replaced while the CNC is powered on?

Yes. With CNC and servo power on, the amplifier supply maintains ABS encoder memory — the BR-CCF2TH can be disconnected and replaced without position data loss. Connect the new battery before disconnecting the old one where possible. Replacement with power off risks absolute position loss if the gap exceeds the encoder's hold-up time.

Q3: What is the difference between BR-CCF2TH and the smaller BR-AGCF2W used in other FANUC servo systems?

BR-CCF2TH uses 2 × C-size cells for 5000mAh at 6V — the higher capacity pack for FANUC Alpha ABS servo amplifiers requiring longer backup duration. BR-AGCF2W uses 2 × A-size cells for approximately 1800mAh at 6V — for Beta series amplifiers with lower capacity requirements. Both use Panasonic BR chemistry and brown JAE connectors, but the physical sizes and FANUC systems they serve differ.

Q4: What is the shelf life of an unused BR-CCF2TH?

Approximately 10 years at room temperature. Panasonic BR-series Li-CFₓ cells have a low self-discharge rate — an unused BR-CCF2TH retains the majority of its 5Ah capacity over a decade of storage. Check the manufacture date when using stored stock — replace any battery showing the 10-year mark regardless of visual condition.