External Power for Series Bass (Wireless Freedom)

[smuprof]

And here it is strapped on.  I can easily reach behind me and access the transmitter to turn it on and off.
 

[smuprof]

The battery life with 4 new alkaline batteries is a solid 12 hours, powering LEDs and electronics.  I ran them all the way down to the point they stopped working (no LEDs, no sound).  They worked great right up until they stopped working.  No distortion, no loss, just dead.
 
The box was designed to make it easy to replace the batteries - pull it out of the holster, open both sides, pop out the 9v's and put in 4 new ones.  Probably less than 60 seconds.
 
Here's the cool part:  I play in church and so they died halfway through the service.  I didn't realize they were dead until I strapped on to play the special, so not enough time to replace the batteries.  No problem.  Pulled the 1/4 jack from the battery pack and plugged it directly into the bass.  Now the internal batteries are powering the electronics (no LEDs, but better than no bass for the special).  Worked great and carried me through the service.
 
Essentially, the internal batteries become the emergency back up for the external battery pack.  No more worrying about battery failure.

[smuprof]

One final thought:  I've switched pretty much exclusively to lithium polymer and lithium ion 9v rechargeables.  I consistently get the same 12 hour life (or more) as the 9v alkalines, only with the benefit of being able to recharge every couple of shows and knowing you're starting every event with plenty of battery power to get through the show.  
 
This battery life is pretty consistent in the battery pack, transmitter pack or wireless in-ear monitor pack.  Plus the benefit of not buying and trashing alkalines every week or so.  
 
I like the HiTech brand (higher current capabilities).  I recently bought some rated even higher from China, but have not had the chance to test them.  We've pretty much switched the entire band.  Here's the charging station I made:
 

[dannobasso]

Smuprof,
Though its been 10 years since the last post, Have you considered making any more for members here? I would be interested in ordering one if you are ever inclined.

Danno