Id like to build a battery pack for a 12v 50w video light using protected 18650 cells since they have gotten so cheap (3.50$ each on DX). I found a 4 cell pack (2S2P so I think its running 7.4v, 4800mAh with 2400mAh cells).
http://mike.baikov.ru/18650/
What I'm having trouble finding is something I can put between the pack and the light that will lower the voltage from 14.8 (over 16v when fully charged) to 12v for the light. The cells individual protection circuits should protect them from being over discharged by the light, and roughly 5Ah should work find for most video work I'll be doing.
Any suggestions?
http://mike.baikov.ru/18650/
What I'm having trouble finding is something I can put between the pack and the light that will lower the voltage from 14.8 (over 16v when fully charged) to 12v for the light. The cells individual protection circuits should protect them from being over discharged by the light, and roughly 5Ah should work find for most video work I'll be doing.
Any suggestions?