Sanyo CLT880 Replacement Battery 3.6V 2000mAh NiMH

Sanyo CLT880 / CLT980 Series — 3.6V Ni-MH Replacement Battery (60AAM3BMU)

This is a 3.6V, 2000mAh Ni-MH rechargeable battery for Sanyo cordless phone handsets. It fits the CLT880, CLT980, CLT982, and CLT985 series. Use it when the original pack no longer holds a charge or drains too quickly during calls.

• CLT880 / CLT980 series compatibility: These handsets share the same 3.6V single-cell NiMH pack format, connector pinout, and charge circuit. The base station charges via a constant-current trickle matched to this chemistry — swapping the cell does not require any base reconfiguration.
• Bench tested on actual hardware: We cycled this pack through the CLT980 base station and monitored charge acceptance and termination. The BMS in the base correctly detected full charge and dropped to trickle without errors across repeated cycles.
• First-charge protocol for NiMH handsets: Place the handset in the base for a full 16-hour charge before the first use. NiMH cells in cordless phones need a slow initial charge to reach rated capacity — skipping this leaves the pack at 60–70% of its 2000mAh ceiling for the first several uses.

Base station showing no charge light on a new NiMH pack

NiMH cells lose voltage during storage. If a new pack sits long enough, its resting voltage can fall below the threshold the CLT-series base uses to detect a valid battery. The base charge circuit expects a minimum cell voltage before it initiates the charge cycle — too low and it shows no indicator at all. Place the handset in the base and leave it undisturbed for 30–60 minutes; the base will usually detect the slow voltage rise and begin charging normally. If the charge light still does not appear, remove and reseat the handset to trigger a fresh detection attempt.

Talk time shorter than original battery after replacement

New NiMH cells do not deliver full rated capacity immediately — 2000mAh is the figure after three to five full charge and discharge cycles. On the first cycle, effective capacity is typically 60–75% of rated. Each subsequent full cycle conditions the cell further and recovers capacity incrementally. Run three complete charge cycles through the CLT base station before comparing talk time to the original pack.