HK DoubleDouble

Comp Lyfe


The Comp Lyfe HK DoubleDouble

Product Features:

  • 25mm extendo tube that allows you to add an additional 18650 battery to your Comp Lyfe mod (choice of classic or diamond knurl).
  • You only need ONE Comp Lyfe mod to make this DoubleDouble function.
  • Comes with 1 DoubleDouble extension tube + 1 delrin insulator (w/ copper contact) to connect the batteries.
Comp Lyfe Limited Lifetime Warranty: Applies to manufacturers defects only. This does not include normal wear and tear, cross-threading, broken magnets, abuse, loss or theft. If you have a question about our warranty policy (or you need to submit a claim) please email Cloned Comp Lyfe items are not valid under warranty. Please do not post on social media if you have an issue and expect your problem to be solved immediately. Refer to the bottom of our website for more information. Use this item at your own risk. Comp Lyfe LLC will not be held responsible for any misuse, damage or injury due to the operation of this item. Please research this device prior to operating. NOTE: the mod you own must have perfect threads. If you've ever slightly started to thread your button housing in a little off, this may cause the DoubleDouble to not screw on properly. The DoubleDouble is made to fit much tighter for enhanced conductivity. If you have an issue, please email

Available Options: HK 25 Classic DoubleDouble & HK 25 Diamond Knurl DoubleDouble

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