DoubleDouble (DD) Stackable Extension || Comp Lyfe
The DoubleDouble is an extension tube that threads into ALL Comp Lyfe 21700 Sized Tubes. Included is a brand new contact that allows the stacking of batteries for a Series Setup. It can accommodate both 20700 and 21700, along with 18650 and 20650 Batteries with the use of an XL Donut Contact (sold separately).
NOTE: Color pattern may vary with Anodized Titanium finishes.
*PLEASE NOTE THIS PRODUCT WILL ONLY SHIP TO A VERIFIED DOMESTIC BILLING ADDRESS (Your U.S. Credit Card Billing Address) & WILL REQUIRE A SIGNATURE AT DELIVERY. INTERNATIONAL CUSTOMERS MUST PAY BY BANK WIRE TRANSFER. INTERNATIONAL INQUIRES CAN BE MADE >HERE<
*This product does not qualify for free shipping and it has a fixed insured shipping cost of $4.99 for U.S. addresses ONLY.
PLEASE NOTE: This mechanical tube extension is wired in series, meaning that your maximum voltage (4.2V) will be multiplied by the number of battery cells in series, which does the same to your amperage load as well. As such, series mechanical mods require extensive knowledge and familiarity with both Ohm’s Law and battery safety/amp limits in order to be used without risk of damage to yourself or your surroundings. If you are at all unfamiliar with these two subjects, feel free to drop us a line and we’ll be happy to either provide additional information on these matters or suggest comparable alternatives, such as an unregulated device wired in parallel.