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Two rectangular silver lithium-ion camera batteries side by side

Kastar

Kastar LI-42B 2-Pack 3.7V 1400mAh Li-Ion camera battery

SKU CH-4G59-BY50X

Two 3.7V 1400mAh Li-ion batteries replace Panasonic DECT handset packs with UL1642 and CE protection circuits

  • Total capacity5.18 Wh
  • Pack contents2 Batteries
  • Battery chemistryLi-Ion
  • Product typeBattery
  • Product dimensions3 × 2 × 2 in
  • Key featuresHigh Capacity and Manufacture Price.
  • Powers camera longer with 1400mAh high-capacity cells
  • Meets UL1642 and CE safety standards for reliable use
  • Built-in protection against over-charge, over-discharge, over-voltage, over-current and over-heating
  • Two-pack delivers extended run time and improved cycle life
  • Compatible with Panasonic KX-TCA285, KX-TCA385, KX-UDT121, KX-UDT131 and more

Kastar LI-42B two-pack lithium-ion batteries

This two-pack supplies two 3.7 V 1400 mAh lithium-ion cells rated at 5.18 Wh each. They serve as direct replacements for Panasonic DECT handsets including the KX-TCA285, KX-TCA385, KX-UDT121, KX-UDT131, Attune II HD3, WX-CH455, WX-SB100, WX-ST100 and WX-ST300.

Built-in protection circuits

Each cell includes over-charge, over-discharge, over-voltage, over-current and over-heating safeguards. The batteries meet UL1642 and CE standards, reducing the risk of damage to the handset and extending usable cycle life compared with unprotected alternatives.

Check your handset model

Verify that your handset appears in the compatible list or matches Panasonic part numbers N4FUYYYY0018, N4FUYYYY0019, N4FUYYYY0046 or N4FUYYYY0047. This pack is not suitable for devices requiring a different voltage, chemistry or physical form factor.

How it compares

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

Price $11.99
Cheaper than about 75% of the 5,900 comparable items (median $17.99).

Specifications

Product
Brand nameKastar
Model nameLI-42B
Part numberBA-2B-PS42B-B
Total capacity5.18 Wh
Product typeBattery
Power
Battery chemistryLi-Ion
Size & build
Product dimensions3 × 2 × 2 in
In the box
Pack contents2 Batteries

Other versions of this model

5 more in the same range

Questions about this item

How often will the LI-42B lithium-ion packs need replacing?

Each pack delivers 1400 mAh at 3.7 V; cycle life depends on charge habits, but the built-in protection against over-charge, over-discharge, over-voltage, over-current and over-heating helps extend usable lifespan.

What stops the batteries first during a long DECT handset shift?

The 5.18 Wh capacity sets the talk-time ceiling; once the cells reach their low-voltage cut-off the protection circuit shuts the pack down to prevent deep discharge.

Do the packs run hot or draw extra power when the handset is on all day?

The UL1642 and CE certified cells include over-heating protection, so temperature and self-discharge stay low during continuous standby or talk use.

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