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Four rectangular lithium-ion camera batteries in blue wrap

Kastar

Kastar LI-42B 4-pack 3.7V 1400mAh camera battery

SKU CH-4C3R-A03K0

Four-pack of 3.7 V 1400 mAh lithium-ion batteries compatible with Sony VGP-BMS77, SP60 and SP60BPRA9C mouse models

  • Total capacity5.18 Wh
  • Pack contents4 Batteries
  • Battery chemistryLi-Ion
  • Product typeBattery
  • Product dimensions3 × 2 × 3 in
  • Key featuresHigh Capacity and Manufacture Price.
  • 4-pack delivers extended shooting time with 1400 mAh per cell
  • 7 V lithium-ion chemistry provides stable voltage for consistent camera operation
  • Built-in protection guards against over-charge, over-discharge and over-heating
  • UL1642 and CE certified cells ensure safe replacement for original battery
  • Compatible with Sony VGP-BMS77 and part number 4-268-590-02

Kastar LI-42B 4-pack camera battery

This set contains four lithium-ion cells rated at 3.7V and 1400mAh each. They are built as direct replacements for the Sony VGP-BMS77 battery used in Bluetooth laser mice. Photographers or office users who rely on compatible Sony devices receive a ready supply of spare power in one purchase.

Thermals noise and power draw

Each cell stores 5.18 Wh of energy and includes built-in protection against over-charge, over-discharge, over-voltage, over-current and over-heating. The lithium-ion chemistry delivers stable voltage during normal operation without audible noise or active cooling requirements. Safety compliance follows UL1642 and CE standards for reliable daily use.

Bundled value and protection

The four-battery pack reduces the cost per unit compared to single purchases and keeps spares on hand for continuous workflow. Integrated protection circuits extend cycle life by preventing common damage modes during charging and storage. Users gain longer run time between charges without needing additional accessories or software.

How it compares

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

Price $18.99
Pricier than about 55% of the 5,900 comparable items (median $17.99).

Specifications

Product
Brand nameKastar
Model nameLI-42B
Part numberBA-4B-PS42B-S
Total capacity5.18 Wh
Product typeBattery
Power
Battery chemistryLi-Ion
Size & build
Product dimensions3 × 2 × 3 in
In the box
Pack contents4 Batteries

Other versions of this model

5 more in the same range

Questions about this item

How do I install the Kastar LI-42B batteries in my Sony Bluetooth Laser Mouse VGP-BMS77, and what step is often missed?

Open the mouse battery compartment, insert each 3.7V 1400mAh cell matching the polarity symbols, then close the cover firmly; the step often missed is verifying the protection circuit seats flush so the mouse powers on.

What maintenance or replacement will these Li-Ion cells need over time?

The 1400mAh Li-Ion packs require no scheduled maintenance; replace all four when run-time drops noticeably or the built-in over-charge and over-discharge protection can no longer hold a full 5.18 Wh charge.

What limit appears first during sustained use of the Kastar LI-42B pack?

Under continuous drain the 1400mAh capacity is the first limit; once the 5.18 Wh rating is depleted the over-discharge protection cuts power until the cells are recharged.

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