Quote:
Originally Posted by sikeston34m
The Boombox came in today, and it's great. The thing really jams.
So...........on with the Battery Pack building.
We now know our compartment size and how many will fit.
We are using 42 cell phone batteries to make the big one.
See that little jewel in there?
Complete with their own pcb's, stacks of 7 are arranged in preparation to make parallel cells.
Then shrink is applied to the lower most portion of the stacks to hold everything while soldering.
Six of these stacks will be used. This fit the size shrink I had on hand.
I did some testing. A single cell discharged to 3.0volts, took back 950mah. This makes the large 3S pack's capacity, about 13,300mah.
When the box is really jamming, the power analyzer reports amp spikes around 1.3 amps. This will make for about 10 hours of extra loud tunes per charge! 
Much longer tunes at lower volume levels. As a moderate volume only pulls .5 amps. Moderate volume runtimes will be around 30 hours or so.
I'll report back as progress continues. |
Not sure how many of those batteries you have left, but if I decide to get one of these Ghetto Blasters, would you be willing to sell some?