Jump Starter Packs

[MB]

Do you reckon I should take mine back Craig mate? I thought 12.7ish meant fully charged on 12v batteries or are these little packs different somehow?


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[Plasnart]

Marko. Was that the same one you started that big dam pump motor with? That impressed the hell out of me. A running navara couldnt do it and that small thing zapped it to life.

Exact reason I went and bought one. Would not have believed it if I didnt see it. Such a small device, but that punch!

[the evil twin]

Just measured mine too after charging with it registering 100% and only reads 12.28. Not sure if I have a dud but started the tractor last time at 80% no problems.

Thats too low, mate... for a LiFePo 90 to 100% S.O.C. no load voltage should be up in the 13's or even very low 14's.

Did you measure that voltage at the "jump start" terminals or at one of the other pairs?
The "jump" terminals are 'hot' off the battery pack but on a lot of the various packs those 'aux' and 'test' terminals will have circuitry on them and you may not be seeing the battery itself

[MB]

Thanks mate, yeah I just stuck the multimeter straight into the units jump starter plug connection under the rubber flap.


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[TPC]

Thats too low, mate... for a LiFePo 90 to 100% S.O.C. no load voltage should be up in the 13's or even very low 14's.

Did you measure that voltage at the "jump start" terminals or at one of the other pairs?
The "jump" terminals are 'hot' off the battery pack but on a lot of the various packs those 'aux' and 'test' terminals will have circuitry on them and you may not be seeing the battery itself

I would have thought the maximum voltage would be 12.6V out of these.
I believe they are using 3.6V cells that have a maximum voltage of 4.2V and have 3 in series for a maximum of 12.6V fully charged.

[the evil twin]

Thanks mate, yeah I just stuck the multimeter straight into the units jump starter plug connection under the rubber flap.

Hmmm... OK... what sort/brand/part # pack did you buy?

I'm not convinced there is something wrong yet just curious
Mine has no output on the jump terminals unless I go to 'override' IE the pack can tell if there is a battery connected or not.
You could try putting it on Charge and see if the voltage changes then leave it a while and check volts again even tho it says 100% on the indication

[the evil twin]

I would have thought the maximum voltage would be 12.6V out of these.
I believe they are using 3.6V cells that have a maximum voltage of 4.2V and have 3 in series for a maximum of 12.6V fully charged.

Dunno... could be that some use 3 and some 4 maybe.
Mine definitely goes up around 14 when fully charged and for interest I just confirmed 13.6 at the terminals (last charged 2 months ago) with the lamp on as a load albeit a small one.

I also wouldn't have thought they would use the overcharge (4.2V) for the normal charging of the packs but maybe they do on some.
As mentioned, on mine I have to go to override which takes out the fault diagnosis and reverse protection circuits.

I asked MB what he bought so might shed some light on it.

[TPC]

Dunno... could be that some use 3 and some 4 maybe.
Mine definitely goes up around 14 when fully charged and for interest I just confirmed 13.7 at the terminals (last charged 2 months ago) with the lamp on as a load albeit a small one
I asked MB what he bought so might shed some light on it.

You may be right about some using 3 and some using 4, mine is a Laser brand and it uses 3.
Had a look online to look for specs of other brands but most don't have how many cells they use.

[the evil twin]

Apols TPC... I amended my post but got distracted and forgot to submit before you replied.

Agree the online specs are poor and indeed claims made for some are rubbish.
3 versus 4 would explain the price disparity among some of them that is for sure.

The model I bought for work (and one for myself) were around a couple of hunjy $ at the time and were the biggest I could get that were still legal for commercial air travel

[MB]

Hmmm... OK... what sort/brand/part # pack did you buy?

I'm not convinced there is something wrong yet just curious
Mine has no output on the jump terminals unless I go to 'override' IE the pack can tell if there is a battery connected or not.
You could try putting it on Charge and see if the voltage changes then leave it a while and check volts again even tho it says 100% on the indication

Cheers ET, I’ll have to try that soon mate, it’s not with me atm. It does have a little box thingy on the jumper + lead line that from memory on instructions required specific timing press I think during a jump.


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