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Two small rectangular batteries and a compact USB charger with LCD screen

Kastar

Kastar LI-42B 2-pack battery & USB charger

SKU CH-SEF9-5GM77

Two lithium-ion batteries and a USB charger that powers both at once for Sony Bluetooth laser mouse models

  • Total capacity5.18 Wh
  • Pack contents1 Charger + 2 Batteries
  • Battery chemistryLi-Ion
  • Product typeBattery & Charger
  • Product dimensions5 × 3 × 2 in
  • Key featuresLCD USB Dual charger, can charge 2 batteries at the same tim
  • Dual-bay charger powers two batteries simultaneously
  • LCD screen shows real-time charge status and capacity
  • Micro-USB and USB-C inputs offer flexible power options
  • 1400 mAh lithium-ion cells deliver 3.7 V / 5.18 Wh
  • Compact 5 V 15 W adapter charges at 800 mA per slot

Two batteries and a dual-slot USB charger

The Kastar LI-42B pack supplies two 1400 mAh lithium-ion cells plus a charger that can fill both at once. Each cell stores 5.18 Wh at 3.7 V. The set targets owners of Sony Bluetooth Laser Mouse models VGP-BMS77, SP60 and SP60BPRA9C who need a spare pair and a compact way to recharge them.

Check your mouse takes the listed part numbers

Confirm the original battery is marked Sony 4-268-590-02 or one of the other codes shown above. The charger accepts only the supplied LI-42B format, so it cannot be used with other cell sizes or chemistries. Both Micro-USB and USB-C inputs are provided, but a power source capable of 5 V at 2–3 A is required for full 15 W input.

Charger runs from any 5 V USB supply

During a typical cycle the unit draws up to 15 W and delivers 4.2 V at 800 mA per slot. The intelligent LED display shows capacity and status while the compact enclosure stays warm but not hot. No fan is fitted, so operation is silent.

How it compares

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

Price $17.99
Typical for this category: the median of 5,900 items is $17.99.

Specifications

Product
Brand nameKastar
Model nameLI-42B
Part numberCH-LTD2-2B-PS42B-S
Total capacity5.18 Wh
Product typeBattery & Charger
Power
Battery chemistryLi-Ion
Size & build
Product dimensions5 × 3 × 2 in
In the box
Pack contents1 Charger + 2 Batteries

Questions about this item

What does the box contain and do I need to buy anything else to start charging?

The pack includes one dual-slot USB charger and two 3.7 V 1400 mAh lithium-ion batteries. A Micro-USB cable is supplied; you only need a 5 V USB power source such as a phone charger or power bank.

There is only one model listed — how do I know this is the right version for my Sony mouse?

The batteries replace Sony VGP-BMS77, 4-268-590-02, SP60 and SP60BPRA9C cells used in the Sony Bluetooth Laser Mouse, so this single SKU covers all those part numbers.

What does the 5.18 Wh rating mean for actual runtime in the mouse?

Each cell stores 5.18 Wh at 3.7 V, giving 1400 mAh; the charger delivers 4.2 V at 800 mA per slot and can fill both batteries in roughly the same cycle.

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