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X2 18V Battery, 4.0Ah Starter Pack

SKU:S2K0B2-06

Includes: 2x X2 18V Battery, 4.0Ah + X2 18V Charger, 6.0Ah


Load up and get working with the SENIX X2 18V Battery, 4.0Ah Starter Pack. SENIX X2 18V batteries offer reliable power in a compact design.  Featuring a power level LED display for easy monitoring and a safety Battery Management System for protection, the batteries ensure both performance and safety - Perfect for efficient, uninterrupted work. The SENIX CHDX2-M-EU X2 18V Charger, 6.0Ah Dual Port provides rapid charging in as little as 24 minutes. The LED display provides real-time charging status, while the wall mounting hole design offers convenient storage options. When both batteries are loaded, the charger will charge one fully first, allowing you to get back to work faster. For use with SENIX X2 18V batteries. Backed by our 3-year limited warranty for your peace of mind.

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X2 18V Battery, 4.0Ah Starter Pack
X2 18V Battery, 4.0Ah Starter Pack
X2 18V Battery, 4.0Ah Starter Pack
X2 18V Battery, 4.0Ah Starter Pack
X2 18V Battery, 4.0Ah Starter Pack

X2 18V Battery, 4.0Ah Starter Pack

★★★★★ (5.0)

Includes: 2x X2 18V Battery, 4.0Ah + X2 18V Charger, 6.0Ah


Load up and get working with the SENIX X2 18V Battery, 4.0Ah Starter Pack. SENIX X2 18V batteries offer reliable power in a compact design.  Featuring a power level LED display for easy monitoring and a safety Battery Management System for protection, the batteries ensure both performance and safety - Perfect for efficient, uninterrupted work. The SENIX CHDX2-M-EU X2 18V Charger, 6.0Ah Dual Port provides rapid charging in as little as 24 minutes. The LED display provides real-time charging status, while the wall mounting hole design offers convenient storage options. When both batteries are loaded, the charger will charge one fully first, allowing you to get back to work faster. For use with SENIX X2 18V batteries. Backed by our 3-year limited warranty for your peace of mind.

Charger

Battery(Ah)


B20X2

B25X2

B40X2

B60X2

B80X2


2Ah

18650)

2.5Ah

18650)

4Ah

18650)

6Ah

21700)

8Ah

21700)

2.0A Charger

CHX2

65min

85min

135min

195min

260min

4.0A Charger

CHQX2

35min

45min

65min

105min

140min

6.0A Charger

CHQX2-M-EU

35min

45min

50min

75min

100min

6.0A Dual-port charger--

Charging two batteries at the same time

CHDX2-M-EU

80min

95min

100min

155min

195min

6.0A Dual-port charger--

Charging only one battery


40min

50min

55min

85min

110min

Note: The battery pack charging time error is ±5min







KEY FEATURES

  • Power Level LED Display – Easily check remaining battery life at a glance to plan your work without interruptions.

  • Compact & Lightweight Design – The battery is easy to handle, store, and swap, reducing fatigue during long tasks.

  • Advanced Safety BMS – Built-in Battery Management System ensures protection against overcharging, overheating, and short circuits for long-lasting performance.

Specifications

Model

B40X2

Voltage

18V

Battery Type

Lithium-ion

Rated Capacity

4Ah / 72Wh

Machine Weight

0.63kg

Series-parallel system

5S2P

Cell Type

18650

Recommended Ambient

Temperature for Charging

41°F~104°F(5°C~40°C)

Optimum Storage Temperature

in use

50°F~80°F(10°C~26°C)

Certification

UN38.3, UL 2595

Machine Size

119.9*76.5*68.7mm

Product Summary

  • Product Overview

  • Load up and get working with the SENIX X2 18V Battery, 4.0Ah Starter Pack. SENIX X2 18V batteries offer reliable power in a compact design.  Featuring a power level LED display for easy monitoring and a safety Battery Management System for protection, the batteries ensure both performance and safety - Perfect for efficient, uninterrupted work. The SENIX CHDX2-M-EU X2 18V Charger, 6.0Ah Dual Port provides rapid charging in as little as 24 minutes. The LED display provides real-time charging status, while the wall mounting hole design offers convenient storage options. When both batteries are loaded, the charger will charge one fully first, allowing you to get back to work faster. For use with SENIX X2 18V batteries. Backed by our 3-year limited warranty for your peace of mind.

  • Usage Scenarios

  • Compatible with all SENIX X2 18V and 2X2 36V Cordless tools. 

  • Unrecommended Conditions

  • Do not expose the battery to water, heavy rain, or extremely humid environments.

    Avoid charging or using the battery outside the recommended range (41°F–104°F / 5°C–40°C).

    Do not store in temperatures above 80°F (26°C) or below freezing for long periods.

    Not suitable for heavy-duty equipment requiring higher-capacity batteries.

  • SENIX Warranty at a Glance

  • Lithium Power Tools: 5 YEARS

    Lithium Batteries & Chargers: 3 YEARS

    Petrol Products: 2 YEARS (home) / 6 MONTHS (commercial)

    AC Corded Products: 2 YEARS

    Power Stations: 2 YEARS

    Covers defects in materials and workmanship under normal use. Full terms available in the SENIX warranty policy.

FREQUENTLY ASKED QUESTIONS

  • Q1: Can I use the 4.0Ah battery with all SENIX 18V tools?
  • Yes, the B40X2 is fully compatible with all SENIX X2 18V platform tools.

  • Q2: How does it compare to the 2.0Ah and 2.5Ah batteries?

  • The 4.0Ah offers significantly longer runtime, though it’s heavier (0.63 kg vs. 0.37–0.39 kg).

  • Q3: How long does it take to charge?

  • With a standard SENIX charger, expect 50-135 minutes depending on charger output.

  • Q4: Does the LED indicator show charging progress?

  • No, it shows remaining battery life when in use, not charging status.

  • Q5: Is the battery safe for professional daily use?

  • Yes, with its advanced BMS and certifications, it’s designed for both DIY and professional reliability.