FK Irons Black LightningBolt Uni Battery Pack — Double Pack

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SKU 00925-00-D
Weight 0.280000
Brand Darklab

Double Pack of LightningBolt Uni Battery Packs by FK Irons — Bluetooth Compatible

Turn your favorite rotary tattoo machine into a wireless powerhouse with the LightningBolt Uni Battery Pack by FK Irons. Redesigned from the original LightningBolt, the Uni fits all major RCA tattoo machines and brands like a glove.

Compact but powerful as a lightning bolt, the battery maintains all your favorite features from the original design. It’s powered by a dynamic USB-C Li-Ion battery and operates for up to 10 hours after just one charge, making it super dependable for longer tattooing sessions. You can easily adjust the voltage with the quick press of a button and enjoy the advantage of LED indicators for voltage and battery life.

This robust battery pack is also Bluetooth enabled, allowing you to connect to the mobile app and access additional features like voice control, wireless footswitch use, voltage control, and eGive.

This listing is for one pack of two LightningBolt batteries.


  • Net Weight: 2oz (~58g) per battery
  • Automatic jumpstart feature
  • Features LED indicators for battery life and voltage
  • Fast charging speed up to 1.5 Amps with Darklab USB power units
  • Operates for 6 hours up to 10 hours after one charge; operation time varies based on artist’s parameters
  • Features a USB-C Li-Ion battery for dynamic power path management
  • Compatible with all major RCA tattoo machines and brands
  • Bluetooth enabled; can be paired with upcoming mobile app to unlock special features and update firmware
  • Firmware updates ensure this battery pack is “future proof”; will be compatible with future wireless devices
  • Available as a single battery

Size Table

Standard Body Jewelry Measurements

The following webchart is a quick reference guide for standard body jewelry measurements and how to measure basic body jewelry. Please print this webchart to help measure your body jewelry accurately.

Size Reference Chart

Visit our PainfulPleasures Infocenter for additional body jewelry information. There, you will find detailed articles on standard body jewelry sizes, how to measure body jewelry, basic body jewelry, and more.

Standard Body Jewelry Threading

Ensure compatibility between standard (non-custom) PainfulPleasures body jewelry parts using the tables below. More information on threading, including custom thread patterns, can be found in our Threading Infocenter article.

Internally threaded jewelry has a threaded post on the top and/or end, which is then inserted into a threaded hole in the barbell shaft.

Internal Thread Patterns by Gauge


18g, 16g

14g, 12g


Internal Thread Pattern

0.8mm or 0.9mm



Externally threaded jewelry has a threaded post on the barbell shaft, which is then inserted into a threaded hole in the top and/or end.

External Thread Patterns by Gauge


18g, 16g

14g, 12g, 10g

External Thread Pattern



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