Your piece of string is as long as you use it

In other words if you run your tank nonstop the thing wont last 20 minutes (You will know when it is going flat,The headlights start flashing,) And that is why some of us use Li-po battery's, size for size they outlast NiMhs and Ni-Cads,
These two types is what Heng Long used to supply as original equipment but no longer,
You will not have to worry about what a Li-po looks like because your two Heng Long Version 6.0 Tanks come with very efficient Lions,
The Heng Long and Taigen/Torro supplied Charger is quite literally a waste of time, It will take hours charging a tank battery whereas something like a "Turnigy Accucell 6" from "HobbyKing" will charge any rechargeable battery that you have including lead acid (Often used in Model r/c Boats) as well as those I have already named and it will do it safely in less than half the time and it is affordable,
Other aftermarket chargers are available and it pays searching,
About £30 is the kind of price you would expect to pay Assuming you are in the UK

You never got round to telling us where you are.
Quite a few of us use magnets to hold the Tank body to the Hull but Taigen sell a quick release kit that fits Taigen, Torro AND Heng Long Tanks,
The kit was and indeed still may be available from one of the best dealers in our hobby,
Dave of
www.forgebeartanks.com
If it is not on his site then E-Mail him and he will help you out.
Dom @
www.rctank.de/
will almost certainly have the Taigen quick release in stock,As Germany has just reduced VAT to 5% perhaps now is the time to think of buying from him
Dom is a very good dealer and just like Dave utterly trustworthy,
Hope that helps and keep asking the questions,
The only stupid question is the one you never ask.
