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A rectangular black charger with LCD screen and three battery slots plus one silver battery

Kastar

Kastar LI-42B 1400mAh battery & LCD triple USB charger

SKU CH-S37Q-RXMZX

A 1400mAh lithium-ion battery with a triple USB charger that powers three cells simultaneously and shows status on an LCD screen

  • Total capacity5.18 Wh
  • Pack contents1 Charger + 1 Battery
  • Battery chemistryLi-Ion
  • Product typeBattery & Charger
  • Product dimensions3 × 2 × 2 in
  • Key featuresLCD USB Triple charger, can charge 3 batteries at the same t
  • LCD shows charge level for each battery
  • Triple slots charge three packs simultaneously
  • USB power works from wall, car or computer
  • 1400 mAh lithium-ion cell replaces Panasonic originals
  • Fits KX-TCA285, KX-TCA385, KX-UDT121, KX-UDT131 handsets

Kastar LI-42B battery and triple USB charger

This set pairs a 1400mAh lithium-ion cell with a charger that accepts three batteries at once. It targets users of Panasonic DECT handsets such as the KX-TCA285 or Attune II HD3 who need a spare power source and a way to replenish multiple packs from a single USB port.

LCD triple charger with Micro USB input

The charger shows real-time capacity and status on an integrated LCD for each of its three slots. It draws 5 V 2 A from any standard USB wall adapter, car charger or computer port and outputs 4.2 V 0.5 A per channel, so all three batteries charge simultaneously without extra cables.

5.18 Wh cell for Panasonic DECT handsets

The 3.7 V battery delivers 5.18 Wh, matching the original packs for models including WX‑CH455, WX‑SB100 and KX‑UDT121. It will not suit devices that require a different voltage, higher capacity or a proprietary form factor outside the listed part numbers.

How it compares

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

Price $14.99
Cheaper than about 60% of the 5,900 comparable items (median $17.99).

Specifications

Product
Brand nameKastar
Model nameLI-42B
Part numberCH-LED3-1B-PS42B-B
Total capacity5.18 Wh
Product typeBattery & Charger
Power
Battery chemistryLi-Ion
Size & build
Product dimensions3 × 2 × 2 in
In the box
Pack contents1 Charger + 1 Battery

Other versions of this model

5 more in the same range

Questions about this item

How long will the 1400 mAh lithium-ion cell hold a useful charge before I need a replacement?

Lithium-ion cells of this chemistry generally retain usable capacity for several hundred full charge cycles; with typical daily charging you can expect one to two years before run-time drops enough to warrant a fresh pack.

What stops the LCD triple charger from running continuously when I charge three packs back-to-back?

The charger draws 5 V at 2 A (10 W) and delivers 4.2 V at 0.5 A per slot, so sustained use is limited by the USB power source’s ability to maintain that 10 W input without overheating or shutting down.

How hot or loud does the charger get when all three bays are working all day?

The unit has no fan and only low-current 0.5 A outputs, so it stays barely warm to the touch and is completely silent even during extended triple-bay charging sessions.

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