KPN Chicago 330 Micro Cordless Phone Compatible Battery 3.6V 500mAh

KPN Chicago 330 Micro — 3.6V Ni-MH Replacement Battery

This is a 3.6V 500mAh Ni-MH rechargeable battery for the KPN Chicago 330 Micro cordless handset. It slots into the handset battery compartment and powers the phone during cordless use away from the base station. When the original pack no longer holds charge through a normal day, this is the direct swap.

• Chicago 330 Micro fit: The 330 Micro uses a compact 3.6V single-cell Ni-MH pack. The physical dimensions — 47.36 x 34.20 x 7.49mm — match the cavity exactly, and the cell voltage matches the base station's charge circuit expectations.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on Ni-MH test equipment. The BMS accepted charge normally, voltage held steady across the discharge curve, and capacity tracked close to rated 500mAh by cycle three.
• First-charge protocol for Ni-MH cordless packs: After fitting the new battery, seat the handset in the base and leave it for a full 16 hours before first use. Ni-MH cells in cordless phones need that slow initial charge to reach rated capacity — skipping it can lock in a lower capacity ceiling.

Talk time shorter than the original battery after replacement

New Ni-MH cells ship in a partially discharged state and haven't been conditioned. On the first one to three cycles, measured capacity typically runs 15–25% below rated. This isn't a fault — it's the chemistry settling. Each full charge and discharge cycle builds capacity toward the rated 500mAh. By cycle five, most packs are performing at or near spec.

Base station not charging or showing an error light after swap

A new Ni-MH pack stored at low voltage can sit below the threshold the base station expects before it starts a charge cycle. The base reads the pack as faulty and refuses to charge, or shows an error indicator. Remove the handset, hold the power button for five seconds to fully discharge residual voltage, then reseat it in the base. The charger circuit should recognise the pack and begin the charge cycle normally.