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Rectangular lithium-ion camera battery, light grey plastic casing, labelled 1400mAh 3.7V

Kastar

Kastar LI-42B 1400mAh 3.7V Li-Ion camera battery

SKU CH-YEHB-T7END

3.7 V, 1400 mAh lithium-ion pack replaces Panasonic N4FUYYYY part numbers 18, 19, 46, 47 and fits KX-TCA285, KX-TCA385, KX-UDT121, KX-UDT131, Attune II HD3, WX-CH455, WX-SB100, WX-ST100.

  • Total capacity5.18 Wh
  • Pack contents1 Battery
  • Battery chemistryLi-Ion
  • Product typeBattery
  • Product dimensions3 × 2 × 1 in
  • Key featuresHigh Capacity and Manufacture Price.
  • Longer shooting sessions with 1400mAh capacity
  • Safe operation thanks to UL1642 & CE certified cells
  • Built-in protection against over-charge, over-discharge and over-heating
  • Replaces Panasonic N4FUYYYY0018, N4FUYYYY0019, N4FUYYYY0046 and N4FUYYYY0047
  • Fits Panasonic KX-TCA285, KX-TCA385, KX-UDT121, KX-UDT131 and more

Replacement for Panasonic handsets

This Kastar LI-42B lithium-ion cell replaces Panasonic part numbers N4FUYYYY0018, N4FUYYYY0019, N4FUYYYY0046 and N4FUYYYY0047. It fits DECT handsets such as the KX-TCA285, KX-TCA385, KX-UDT121, KX-UDT131, Attune II HD3, WX-CH455, WX-SB100, WX-ST100 and WX-ST300. The 3.7 V, 1400 mAh pack delivers 5.18 Wh of capacity.

Upgrading from lower-capacity cells

If the original battery no longer holds a full shift's charge, this higher-capacity unit restores talk and standby time without changing handsets. The jump is worth it when the existing pack shows reduced run time or requires frequent top-ups during the day. Built-in protection circuits guard against over-charge, over-discharge, over-voltage, over-current and over-heating.

Check the handset model before ordering

Verify that your handset appears in the compatible list above; other Panasonic models may use a different form factor or connector. Confirm the battery compartment accepts a 3.7 V lithium-ion pack of this physical size. This pack is not suitable for devices that require a different voltage or chemistry.

How it compares

Measured against everything we stock in Camera Batteries, Grips & Chargers, at today’s prices. Recalculated every night.

Price $6.99
Cheaper than about 92% of the 5,900 comparable items (median $17.99).

Specifications

Product
Brand nameKastar
Model nameLI-42B
Part numberBA-1B-PS42B-A
Total capacity5.18 Wh
Product typeBattery
Power
Battery chemistryLi-Ion
Size & build
Product dimensions3 × 2 × 1 in
In the box
Pack contents1 Battery

Other versions of this model

5 more in the same range

Questions about this item

Will the LI-42B battery fit inside my Panasonic KX-TCA285 handset?

Yes — the LI-42B replaces Panasonic part numbers N4FUYYYY0018, N4FUYYYY0019, N4FUYYYY0046 and N4FUYYYY0047, which are the original packs for the KX-TCA285 and other listed models.

How do I install the LI-42B and what is the common mistake?

Power off the handset, open the battery compartment, remove the old pack, insert the LI-42B with the contacts aligned, close the cover and charge fully before first use; the step often missed is that initial full charge.

When will the LI-42B need replacing?

Replace the pack when talk or standby time becomes noticeably shorter or the battery no longer reaches a full charge after a normal charging cycle.

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