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Small black handheld battery checker with 2.1 inch screen and balance connector ports

RCpow Langtu Cellmeter 7 Battery Checker 2.1" 0.001V

SKU CH-JW3Q-8CJ87

Checks LiPo, LiFe, Li-ion, NiMH and NiCd packs from two to seven cells with 0.001 V precision on a 2.1 inch display

  • Team affiliation1 Piece
  • Key featuresLipo Battery Checker, NIST, Battery Powered, false
  • Overall height10 L x 8 W x 3 H centimeters
  • Overall width10 L x 8 W x 3 H centimeters
  • Overall length10 L x 8 W x 3 H centimeters
  • Product weight50 g
  • Checks LiPo, LiFe, Li-ion, NiMH, NiCd packs
  • 1" screen shows cell, total, min, max, gap, capacity %
  • 001 V precision on every cell reading
  • Compact 8.4 × 5 × 1.6 cm, 45 g for field use
  • Includes servo test range 1000–2000 µs / 500–2500 µs

Purpose and audience

The RCpow Langtu Cellmeter 7 is a compact digital battery checker designed for hobbyists who fly or drive radio-controlled models. It reads individual cell voltages and total pack voltage for lithium and nickel-based chemistries. The 2.1 inch screen shows lowest cell, highest cell, voltage gap and remaining capacity percentage. The unit weighs approximately 45 grams and fits easily in a field box.

Compatibility check

Verify that your packs use JST-XH or equivalent balance connectors because the tester plugs directly into the balance lead. Confirm the cell count falls within the supported range: two to seven cells for lithium types and four to seven cells for nickel types. The device draws power from the pack under test so no separate supply is required. Ensure you have the balance lead accessible on each pack you intend to measure.

Upgrade context

This meter replaces guesswork with a 0.001 volt resolution display and adds a servo pulse tester covering 500 to 2500 microseconds. If you currently rely on a basic LED indicator or a multimeter without balance-plug access, the jump to per-cell data and capacity percentage is worthwhile. It does not charge, discharge or log data over time, so users needing cycle analysis will need additional equipment.

How it compares

Measured against everything we stock in Multimeters & Electrical Testers, at today’s prices. Recalculated every night.

Price $20.99
Cheaper than about 77% of the 971 comparable items (median $30.99).

Specifications

Product
Brand nameRCpow, Langtu
Product typeVoltmeter
Size & build
Overall height10 L x 8 W x 3 H centimeters
Overall width10 L x 8 W x 3 H centimeters
Overall length10 L x 8 W x 3 H centimeters
Product weight50 g
More details
Team affiliation1 Piece

Questions about this item

What comes in the box and do I need to supply any power source?

The box contains the Cellmeter 7 checker and a user manual. The unit is battery powered but no battery is included, so you must provide a suitable power cell before use.

Which cell-count ranges does this checker support for lithium and nickel chemistries?

It reads 2 to 7 cells for LiPo, LiFe and Li-ion packs, and 4 to 7 cells for NiCd or NiMH packs.

What does the 0.001 V precision mean when I am balancing a pack?

The tester resolves individual cell voltages to the nearest millivolt, letting you see the exact gap between the highest and lowest cells so you can stop charging when the spread is acceptably small.

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