Yes you should be fine.
Now I may be wrong, I'm still not completely sure on these batteries. But batteries in series you add up the voltage, so 3X 3.8v (4.2 batteries but with voltage drops 3.8v is more realistic) for 11.4 volts max. With a 20amp battery if you maxed out the current there you'd have 228watts, so basically you have more at your disposal than you need/can use.
Make sure to continually buy good batteries and chuck them when they stop holding a charge, they do wear out. Always keep them in sets married, always charging together, always being used together, and thrown away together when they're done. And always of the same brand/type, no putting a 25r with a VTC4 and a HG2. Just keep them in sets always together.
VTC4's are best if you want to use higher power as it has a higher amp limit, and the more overhead you have the safer you are. So if you want to be going at 150w+ it's a good idea to get those.
If you're more concerned about the life of your batteries then stick to the HG2/25r's. There are other good ones out there, but those 3 are your general go-to's.
