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Small rectangular nickel-zinc battery with wire connector, green circuit board visible, 41 by 12 by 7 millimetres

Cameron Sino 20mAh 7.2V CMOS Backup Battery for Gateway Solo 2100/2200/2300/3300/3550

SKU CH-P2VT-MW18Q

Replaces the CMOS backup battery in Gateway Solo 2100, 2200, 2300, 3300 and 3550 laptops with a 20 mAh 7.2 V nickel-zinc cell

  • Battery pack size41.32 × 12.42 × 7.52
  • Battery typeNickel zinc
  • Battery capacity20 mAh
  • Battery voltage rating7.2 V
  • Details41.32 × 12.42 × 7.52
  • Product typeNickel zinc
  • Maintains CMOS settings with 20 mAh 7.2 V nickel-zinc cell
  • Direct replacement for Gateway Solo 2100, 2200, 2300, 3300, 3550 series
  • Compact 41.32 × 12.42 × 7.52 mm fits original battery bay
  • Built-in protection against overcharge, over-discharge and short circuit
  • ISO 9001, RoHS and CE certified for safety and quality

Compatible Gateway Solo Models

This nickel-zinc CMOS backup battery replaces the original cell in Gateway Solo 2100, 2200, 2300, 2300LS, 2300XL, 3300, 3350, 3350CS and 3550 notebooks. It supplies 7.2 V and 20 mAh capacity to maintain system time and BIOS settings when the main battery is removed. Builders servicing legacy laptops will find the part number matches 3E158 and 3R459. It is not for users needing a main power pack or higher capacity cells.

Bundled Protection and Packaging

The unit includes overcharge, over-discharge, over-voltage and short-circuit protection circuits built into the decoded chip. A shock-absorbing foam insert inside the package protects the cell during transit. No software, cables or additional chargers are supplied with this single battery.

Dimensions, Mounting and Daily Use

The pack measures 41.32 x 12.42 x 7.52 mm and weighs 7.5 g, fitting the original motherboard connector without modification. Installation videos are widely available online for reference. The chemistry is rated for storage up to 60 °C (140 °F) and meets ISO 9001, RoHS and CE certifications. Best performance is reached after two or three full charge cycles.

How it compares

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

Price $12.99
Pricier than about 60% of the 10,440 comparable items (median $10.99).

Specifications

Product
Brand nameCameron Sino
Model nameInspiron 2100, Inspiron 2800, Inspiron 500M, Inspiron 510M, Inspiron 600M, Inspiron 630M, Inspiron XPS M140, Latitude C400, Latitude C400 PP03L, Latitude D500, Latitude L400
Part number3E158, 3R459
Product typeNickel zinc
Power
Battery typeNickel zinc
Battery capacity20 mAh
Battery voltage rating7.2 V
In the box
Battery pack size41.32 × 12.42 × 7.52

Questions about this item

How often will the 20mAh CMOS backup battery need replacement?

The nickel-zinc cell is designed to last several years under normal system use; plan to swap it when the clock or BIOS settings start resetting on their own.

What is the first limit reached when the 7.2V backup runs continuously?

The 20mAh capacity is the limiting factor; once the stored charge is depleted the CMOS circuit loses power and settings revert to defaults.

Does the 7.2V nickel-zinc cell generate noticeable heat during all-day operation?

No, the tiny 0.14Wh capacity means current draw is micro-amperes, so the cell stays at ambient temperature with no perceptible warmth.

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