Anritsu CMA-4500 Replacement Battery 10.8V 6600mAh Li-ion

Anritsu CMA-4500 — 10.8V Li-ion Replacement Battery

This 10.8V 6600mAh Li-ion battery replaces the internal power cell in the Anritsu CMA-4500 cable and antenna analyzer. The CMA-4500 is a portable RF measurement instrument used for verifying cellular network infrastructure, transmission lines, and antenna systems in the field. Capacity figures come from the product data sheet, not estimated values.

• CMA-4500 platform fit: The CMA-4500 draws steady current during sweep measurements and spikes briefly during transmit tests. This cell matches the voltage rail and connector pinout the instrument expects. The BMS handshake follows the same charge termination profile as the factory cell.
• Bench tested on actual hardware: We cycled this cell through the CMA-4500 charge IC and monitored BMS communication. The protection circuit responded correctly to the analyzer's charge termination signals, and cell voltage held within spec across the measurement load profile.
• First-use self-test on the CMA-4500: After fitting this battery, let the analyzer complete its full power-on self-test without interrupting it. The CMA-4500 runs a BMS verification pass at startup. Cutting power during this sequence stores a false battery fault in firmware that will persist until the next clean boot cycle.

Why the CMA-4500 charge indicator stalls below 100% on the first charge

The CMA-4500 charge IC applies a conservative current limit when it detects a new or recently stored cell. This is a deliberate threshold — the IC reduces charge rate until the cell's internal resistance reading drops within the expected range. On the first charge, this can make the indicator appear to stall at 90–95% for an extended period. The cell is still charging. Let it complete the full cycle without disconnecting power, and subsequent charges will follow the normal profile.

CMA-4500 showing low battery alarm immediately after a confirmed full charge

The CMA-4500 BMS compares the incoming cell's discharge curve against a stored OEM chemistry profile. A new cell that hasn't completed a full charge-discharge cycle yet produces a curve that sits outside the expected window, triggering a low battery warning even at full charge. This is not a fault with the cell — it is the BMS flagging an unrecognised profile. Run one complete charge-to-discharge-to-full-charge cycle, and the BMS will calibrate to the new cell. After that cycle, the alarm clears and the charge indicator reads accurately.