Free Shipping on orders over 99*. Learn More
  $89.99  $69.99
Add to Cart
Add to Wish List
In stock online


Image for 4000mAh LiPo Transmitter Battery: DX8, DX9 from HorizonHobby
+ / - Hover over image to Zoom
4000mAh LiPo Transmitter Battery: DX8, DX9 4000mAh LiPo Transmitter Battery: DX8, DX9
  • Overview
  • Specs
  • Reviews
  • Parts & Accessories
  • Manuals & Support

Key Features

  • Built-in cell balancer
  • Built-in safety current prevents overcharging


The 4000 2S LiPo offers not only double the flight time as the stock DX8 battery but also advanced safety and features. It also includes a built-in safety current that shuts the battery off, to avoid overcharging and damaging the battery and radio. Plus, a built-in balancing system to make sure you get the longest life and power from your pack.

Compatible Products

Spektrum 4000mAh LiPo Transmitter Battery: DX8, DX9 SPMB4000LPTX is compatible with SPM20000
Battery Application: Transmitter Battery
Battery Voltage: 7.4V
Cell Configuration: 2S1P
Charge Protection Circuitry: Yes
Connector Type: White TX Plug
Wire Gauge: 20 AWG

Optional Accessories

In Stock
In Stock

Battery Safety Sheet


Will my JR receiver battery work with other systems?

Yes, JR receiver batteries have a universal type connector and is compatible with most current radio systems.

Can a battery be used after it was charged with polarity reversed?

This depends on the age and condition of the battery, performance may be lessened. Contact JR's Service Center if you're unable to determine the condition of your battery.

Does a JR receiver with a Futaba transmitter?

No. they are not compatible with one another.

Product Support Tips

Product Support

Technical questions about this Spektrum product should be directed to Horizon Hobby's Product Support Department:

Horizon Hobby, LLC.
ATTN: Product Support

2904 Research Road
Champaign, IL 61822

To place a Horizon Hobby Support Inquiry please visit our Inquiry Form Support Phone:(877) 504-0233
Fax:(217) 355-1552

Sales Support

If you would like to purchase this product, please go to the Store Locator or contact the Horizon Hobby Consumer Sales Department:

Horizon Hobby, LLC.
ATTN: Consumer Sales

2904 Research Road
Champaign, IL 61822
Email: Sales Phone:(800) 338-4639
Fax:(217) 355-1552