I agree to everything you guys say but I already have the batteries. - thats the “problem” 
Throw caution to the wind, forget what these well reasoned experts say!
Just wire up a batterypack 30s20p with a 120 plug! enjoy life is short :evil:
Or take up a transportation hobby and use them for an (e) Velomobile, Bicycle, etc etc.
or seriously
take a look at
EVTV UPDATE #01 - Electric Microbus Project
you might want to start at the end with episode #42.
nice, but pricey
Have you tried checking those flashlight-taser circuits?
https://www.fasttech.com/products/0/10002230/1161100-4s1p-14-8v-18650-holder-with-battery-build-in-pcm
and
https://www.fasttech.com/products/0/10002230/1161200-3s1p-18650-11-1v-battery-holder-case-li-ion-pcm
specs:
- Can hold 3 pieces 18650 batteries
- Keep your batteries organized and protected
- Specially designed with modern build-in protection circuit module
- It’s flexible and convenient for various customized application
- Maximal continuous Charging current 4A
- Maximal continuous Discharging current 4A
- Over charge detection voltage 4.325±0.025V
- Over discharge detection voltage 2.4±0.08V
- Over current detection current 6±1A
Cool find but it doesn’t have balancing, only protection:
Specs from batteryspace.com
Some time ago I planned to build a “portable” solar generator, total price was about $1500. Never built it because I realized there was no need for it. (I live in the city and electricity hasn’t gone out in the last year or so). I did all the math and concluded that AGM batteries (70Ah+) would provide the best performance per dollar and would have the longest service life while causing the least hassle to operate.
My setup was going to be like this:
2x 125Ah AGM batteries and 1,000W inverter in a big enclousure. Almost 200lb, 2.4kWh capacity with AC/DC output.
4x 40Ah LiFepo4 calb cells with 20A MTTP controller in a compact pelican case. Portable DC standalone unit with 500Wh capacity.
2x 100W renogy foldable solar panel.
Although I might build the lifepo4 unit with a single renogy panel some day if I stop buying so many flashlights. :~ Compared to Li-ion, lifepo4 is much more forgiving with a way more efficient discharge curve for power storage purposes.
