Hi mate, I have used a small 50mAh 5 cell pack for many years, with no problems at all. I did have a spare charger and it became second nature to charge that small pack (@.5 amp) whilst charging the main 4 cell pack.

I did recently try out a Novak booster, and found that it did not work with my Tekin RS with the 203 software. Strange things happened, like the turbo function would not work, for example. I uninstalled the 203, and used the older version software, and it ran fine, just not fast enough!

I have now got a TQ booster, and it is brilliant. No more worries about recharging the RX pack! All's I did was solder a very small connector from one of the battery posts on the esc, and the other end to the booster so that taking the electronics out for maintenance is made a little easier.

It's so small, you can install it anywhere on your chassis. That's my 2p worth, cheers!