Battery Pack for 12 volt starter - not enough juice (Full Version)

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jchumley -> Battery Pack for 12 volt starter - not enough juice (4/30/2008 1:48:36 PM)

I recently bought the battery pack that Sullivan sells to attach to a starter to make it more portable. It arrived without batteries of course. I bought 12 1700mA sub c batteries, installed them and charged them. The voltmeter reads 16.2 on the charged set. The starter runs but it won't turn over a .40 sized engine. You can lightly hold it with two fingers and keep it from rotating.

I am not a battery guy. It is like alchemy to me. What is wrong here? I am using a Sullivan heavy duty starter (The one shown on Horizon site attached to this battery case.

Jeff



pilotpete2 -> RE: Battery Pack for 12 volt starter - not enough juice (4/30/2008 2:14:55 PM)

Hi Jeff,
Exactly what cells did you get? It sounds as though they are possibly cells with high internal resistance.
Also, a fully charged 12 cell pack should be 12.8V fresh off charge, or very close.
With new Nixx cells it's also important not to try to use a peak detecting charger for the first charge, a 24 hr. charge at 170mA (C/10 rate) will form the cells and balance them.
Good luck,
Pete



jchumley -> RE: Battery Pack for 12 volt starter - not enough juice (4/30/2008 3:13:55 PM)

Thanks Pete. I will have to look at the cells when I get home. I got them from one of the online battery places and they are generic looking cells with slip on cardboard covers and cost $1.97 each. I'm thinking el cheapo here. Maybe I should buy some sanyo or panasonic or something.

Jeff



JustErik -> RE: Battery Pack for 12 volt starter - not enough juice (4/30/2008 5:24:29 PM)


quote:

ORIGINAL: pilotpete2

Hi Jeff,
Exactly what cells did you get? It sounds as though they are possibly cells with high internal resistance.
Also, a fully charged 12 cell pack should be 12.8V fresh off charge, or very close.
With new Nixx cells it's also important not to try to use a peak detecting charger for the first charge, a 24 hr. charge at 170mA (C/10 rate) will form the cells and balance them.
Good luck,
Pete



My 5-cell packs come off the charger with a voltage of 6.7 or 6.8 volts, which is about 1.35 volts per cell. If you have 12 cells, shouldn't the fully charged voltage be as reported, about 16 volts? Am I missing something?



KW_Counter -> RE: Battery Pack for 12 volt starter - not enough juice (4/30/2008 8:42:53 PM)

Eric,
You aren't missing anything. PilotPete is wrong in his statement.
NiCds and NiMhs have a nominal voltage of 1.25 per cell and freshly charged are higher.
My 8 cell xmtr packs read over 11 just after charge and my 4 cell rcvr packs over 5.5.

Jeff,
Cycle the batteries a couple of times at c/10 and then try it.
Make sure all connections are clean.
If that fails try the starter on a car battery and see how it performs.
This will help determine if the starter or pack is causing the problem.
I have a Sullivan starter and pack and it is a good piece of equipment.

Good Luck,
KW_Counter



pilotpete2 -> RE: Battery Pack for 12 volt starter - not enough juice (5/1/2008 1:58:47 AM)


quote:

ORIGINAL: KW_Counter

Eric,
You aren't missing anything. PilotPete is wrong in his statement.
Good Luck,
KW_Counter


No Pete is getting dyslexic methinks[8|]
I meant to type 16.8V, but his measured 16.2 is not too bad equaling 1.35Vpc
Pete



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