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Matt, batteries of differing voltages and differing capacities may be used without trouble in series so long as one stops as soon as the lowest capacity battery is discharged.
In parallel batteries of differing capacities can be used together so long as they are all of the same voltage and of an appropriate chemistry. Don't parallel connect batteries types that exhibit a voltage drop at the end of the charge curve such as nimh or nicad.
And it's not just the faceplate voltage, but the actual state of charge which should match. ie, don't connect a fully charged 12 volt battery to a significantly discharged one or you might get fireworks.
Once slight downside of parallel connected batteries is that if one goes bad it will likely destroy all the connected batteries. Thus it is usually recommended to use batteries of a similar age or at least not connect a very old battery on its last legs to several fairly new ones.
Finally some lithium batteries contain integrated electronic BMS units. The BMS must be designed for parallel connections or you may have trouble such as one or more BMS's going up in smoke when approaching full charge or full discharge.
I read those. Different application, small sample.
Ask Alex. I like 'em in principal because they're so compact. They pretty much have to be class D at that size, meaning they'll have a good run time as well. I would not expect to get even 1/5 of the advertised output though.
Here it is (thanks Alex):
http://www.amazon.com/Lanzar-MNX450-Channel-Mosfet-Amplifier/dp/B00...
They sounded great! Since I was standing near Todd prior to the ride, I was wondering if that was you. :)
Sorry, I can't figure out which one it is. I thought he posted it here.
It was cheap ($80?) and very compact.
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