robot

[typhoon_driver]

You have to make sure that your charger can charge A123s. Lipos have a different cell chemistry to A123s.

[widow_twanky]

Depends how you configure them but those look like a123 1100mah cells.

Firstly they are an absolute sod to solder, secondly you'll probably need to double up on the packs/cells to run long enough.

We've been really pleased with A123's (Life-po4's) since we put them in hydra and dantomkia but the initial soldering is a real pain. the cells have large bits of aluminium on them which act as a heat sink and getting it up to temperature with less than a 100w soldering iron is hard

You may wish to look into a pre-manufactured pack - http://www.hobbyking.com/hobbyking/stor ... rentCat=85

That said NIMH's and Nicads are available in more configurations of pre-made packs and the chargers are cheaper.

[Laser]

ok might order some to test because theyre cheap

[Laser]

Spoke to my dad today about the batteries and he said I'm not alowed them because they're fom Hong Kong.
But what a bout this one: http://www.technobotsonline.com/haze-hz ... -12v-3.3ah
I'm bit confused i dont know what is better for 2-wheel drive 2 electronize 15a, 2 electronize 30a or a sabertooth dual 25a

[rallikas]

Spoke to my dad today about the batteries and he said I'm not alowed them because they're fom Hong Kong.

But whats wrong with the Hong Kong?

[Ellis]

I think the shipping is more expensive, might be wrong, I've also been taught to steer clear of items from Hong Kong.

[rallikas]

Hmm, hobbycity is in Hong Kong. Best place for cheapest rc stuff!

[widow_twanky]

Hmm, hobbycity is in Hong Kong. Best place for cheapest rc stuff!

Hobbyking are also a very good, very reputable company and yes they are cheap. Sometimes things aren't great quality but when you buy a 2.4ghz transmitter for 20 dollars can you really expect something to match the spektrum dx5e which retails at about 75pounds?

You do get what you pay for but in general most of the stuff is ok.

[typhoon_driver]

2-wheel drive 2 electronize 15a, 2 electronize 30a or a sabertooth dual 25a

I'm going to assume you are using two drill motors to provide your drive. The difference between the electronize is the rating or the amount of current that they can handle. The 30A electronize will handle twice the current of the 15A version although the 15A has nice additional processor chip magic in there that means it handles current fine. Basically either one of these controllers will happily handle drill motors all day long. I run 15A (or 12A as they are currently rated if you buy new) in all my machines with no problems even when overvolting. They will happily handle 5 times their rated current for a second or two.

The sabertooth is a more feature packed controller with some nice tweaking available. However it doesn't handle large stall currents or overvolting of motors very well. It should run a 12v drill on 12v source however if you run it at 18v or 24v you may get the magic smoke.

The electronize are single channel meaning you will need one for each motor whereas the sabertooth is a dual channel so two motors can run off one speedo. Cost wise theres not a huge gulf.

To sum up, electronize, not as many features (still give you all you need control wise) but more rugged. Sabertooth, more features, bit more delicate (if you start using it toward its limits).

Various people have their own opinions about controllers like with any hobby. The final decision is up to you.

[widow_twanky]

it is worthwhile noting that dimension engineering (manufacturer of sabertooth) will replace the controller if it blows within the first year (Even if you decide to screw on the wheel by powering the motor and making sure its tight by stalling it for a number of seconds ).

It is a no quibble guarentee and it works well (if they have the stock and you may also get stung for additional custom charges).

I would agree that for the 10A ones they can be very delicate but haven't heard that much in terms of this on the 25A ones.