I use Lipo batteries for all my motor projects. What matters is that it can supply the needed amps so you must use the correct battary to get the correct amps. Lipo batteries designed to run a tablet will only be rated for very small current/amps were as a battery desinged for a RC Hobby car will be designed to supply very high amps. These batteries have what is called a "C" rating, this is how many amps can be supplied per amp/hour capacity i.e a 1C battery with 1000mah capacity can supply 1 amp current. Most RC hobby Lipo battery are rated at least 20C so a bettery with capacity of 2000mah at 20C can supply 40amps where as a Lipo battery for a tablet is usually 1C so the same capacity battery will only be able to supply 2amps.I would definitely recommend a large LiPo cell, somewhere around 5 or 6 thousand mA should fit in the battery cavity.
Usually in engineering you would identify the problem then look for a solution to the underlying problem.Yes, C rating matters, however if OP gets a 5Ah cell or higher, the C rating will not matter (a 1C 5Ah battery is capable of 5A - wiring and boost module permitting)
Op is driving motors originally driven off four AA batteries. In addition, they also want to power a Pi. There is no need for a 100Amp capable hobby-grade RC LiPo pack.OutoftheBOTS wrote: ↑Thu Aug 02, 2018 9:20 pmUsually in engineering you would identify the problem then look for a solution to the underlying problem.Yes, C rating matters, however if OP gets a 5Ah cell or higher, the C rating will not matter (a 1C 5Ah battery is capable of 5A - wiring and boost module permitting)
The OP didn't have a problem of not enough capacity but rather had a problem of not being able to supply enough current. So the best solution is to use a battery that is capable of supplying more current i.e a battery with a higher C rating.
RC hobby batteries are designed to drive motors that require high current where as batteries designed to for low power devices like tables and phones are designed for very low current output.
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The ONLY way I would recomment to charge a LiPo pack, would be with a proper charger designed for such use (i.e. remove it from your Pi, plug it into the charger)