Get more runtime out of your Dereelight DBS or CL1H! 

Allows you to use 2 x 18650 batteries with your 3SM pills (including 3SM MC-E).  When used with the 1SM-2 pills, you can also use 4 x CR123a or RCR123 batteries.  The 1SM-2 pills can handle up to 16 volts (4 RCR123 batteries under load would total around 14.8 volts).

Finished in black HA-III coating.

Requires button-top style batteries (on the positive end of the battery).  Flat-top batteries will not properly contact each other in an "end to end" configuration.