Timthetoolman1

My Feedback: (6)

I have a dismantled Dewalt A123 battery pack I bought a couple years ago and it's just sitting so I though I'd use it in my hand held starter.

How many of the batteries are you guys using? Aren't they 3.2v? Which means I could use 4s or 4s2p?

If you have some pictures of your conversion that would be great.

Thanks, Tim

4*60

My Feedback: (41)

I use a 3s lipo....12.6 charged. I think you could get away with 4s if you don't abuse the time used. 3.3x4

Timthetoolman1

My Feedback: (6)

12.6 sounds good.

Do they need a balancer? I would guess no.

wildnloose

I have a geared starter set up on 4s. Serious overkill but ultra-reliable. I did not even top it off from this winter and it still turned over a 30cc gasser with ease. Fully charged I can spin a 75cc gasser without a hiccup. Kinda like "giving a whale a tic-tac" Battery does know its being used, just not sure how long those motor leads will last starting the big stuff.

Those guys with big heavy lead acid batteries just hate to see me come around with my itty bitty starter

delateurj

I use 5s a123 on a Sullivan starter for few years now with success.

Went 5s instead of 4s to help drive YS 110.

- Joe.

Droiddr

I just bought 2 nano tech batteries from hobbyking. 4s 2200mah. I will probably only use 1 at a time.

Do you think that will do it for my 12v starter ?? Its a magnum (says high torque model engine.... doubt its for big engines though)
Nominal would be around 15.2V

Timthetoolman1

My Feedback: (6)

I would think that's too much. I was hitting for around 12v. But then again you're not going to run it all the time. Let us know how it goes.

Tim

pilotpete2

A 4 cell A123 pack will be around 13.2V nominal, which in the case of LiFE/A123 is pretty much their working voltage, don't worry about the full charge voltage since it drops down to 3.3V per cell so fast. At 13.2V, the A123's will be like using a fully charged 12V Pb battery, but with less voltage sag under load[8D]
Pete

Timthetoolman1

My Feedback: (6)

I thought he was using Lipo batteries. If they're Lipos it may heat it up good.

Droiddr

I did indeed buy a Lipo nano-tech turnigy 4s 2200mah (25-50c).
The nominal would be about 14.8 V (3.7*4). I am not sure what the current draw would be, at 2.2AH*25c = 55A. I would really doubt the starter motor will suck that much even under load.

By heat up good, you mean the motor itself heating up good?

I have seen many posts here where people showed photos of their starter / battery assembly and they would put 18V from a drill battery pack on it without issues to the motor.

I bought the Lipos since it costs me 20$ per battery. I know A123s are fantastic, but $$$$$$


Thanks

dirtybird

My Feedback: (5)

I used 8 A123 cells on a standard Sullivan starter equipped with a Miller Persuader for many engines up to a BME 102 The 3 to 1 speed reduction of the Persuader reduced the load on the starter motor to reasonable level so it was not overloaded.
I currently use a standard Sullivan starter with a 5 cell A123 battery. It probably would not stand up if you tried to start your engine for 1/2 hour like I have seen some do. But for short time use there is no problem.
Heat is what destroys an electric motor. So if it don't get hot there is no problem with what voltage you put on it as long as you don't exceed the breakdown voltage of the windings. That is many more than we use.

Timthetoolman1

My Feedback: (6)

Dirty Birdy said it best, you can set there and try starting a motor that isn't going to start by just holding down the trigger, that's what I mean by hot.
That Persuader at $140 seems like a cool product.

CaptDave2

My Feedback: (2)

How do/did you charge this 8 cell pack? Did you use a Dewalt DC9280 pack and a DC 9000 charger? That charger has balancer logic and contacts.
Thanks for info.