SpectraLink 7480 Cordless Phone Replacement Battery 3.6V 700mAh

SpectraLink 7480 / 7520 / 7540 Series — 3.6V Ni-MH Replacement Battery (84743411)

This is a 3.6V, 700mAh Ni-MH battery for the SpectraLink 7480, 7520, 7522, and 7540 wireless handsets, plus eleven additional models in the same series. It matches OEM part number 84743411 and fits the same physical slot and connector. Capacity figure is 700mAh (2.52Wh) as rated on the cell.

• 7480 / 7520 / 7522 / 7540 series fit: These handsets share the same battery bay dimensions, 3.6V single-cell Ni-MH voltage rail, and connector pinout — one battery covers the full range without any modification.
• Bench tested on actual hardware: We cycled this cell on a SpectraLink 7480 handset. The BMS accepted charge from a standard base station cradle on the first insertion, and discharge curves matched expected Ni-MH behaviour across the flat mid-range.
• First-charge conditioning on NiMH cordless handsets: After installing, seat the handset in the base and leave it for a full 16-hour charge before first use. Ni-MH cells shipped in storage state need a slow first charge to reach rated capacity — a quick top-up will not get there.

Base station showing a charging error on a new Ni-MH pack

SpectraLink base stations detect an incoming battery by measuring its resting voltage before starting the charge cycle. A Ni-MH cell that has sat in storage can drop below the base's acceptance threshold — typically around 3.0V — and the cradle flags an error instead of charging. This is a voltage floor check, not a fault with the battery itself. Reseat the handset, wait 30 seconds, and try again; most bases will retry and accept the cell once it registers above the cutoff.

Talk time shorter than the original battery after replacement

New Ni-MH cells do not hit rated capacity on the first cycle — it typically takes three to five full charge-and-discharge cycles before the cell reaches 700mAh. If talk time feels short in the first few days, that is normal conditioning behaviour, not a defective battery. Run the handset down to the low-battery warning, then return it to the base for a full charge each time. By cycle five, capacity should be at or close to the rated figure.