Battery LA 120amp

PabloPicasso said:
Shaz 77 has a point. It does misrepresent the function.

Imagine buying a ketle that only raises water to 50degrees C, or a car advertised as a 4 seater that could only carry 2 people without damaging it.

I imagine its a throwback to an earlier time when LA was all there was and it was allowed.

Time for change, but nuffin like a bit of edumicating oneself prior to purchase

Go on Shaz77, complain to trading stadards and see what happens....
Click to expand...
To link to another thread....the three Moon Rover cars had non rechargeable batteries....so when they went flat you discard the whole multi million dollar vehicle and walk....but nonetheless they did have the potential to reach their stated range. So the batteries in question will (when new) give what’s written on the label....and the life of the product is expressed in a different way based on careful useage
 
I think the 120ah is just what it says. The misleading information is what people believe what it means.
A 120ah battery is , due to its design and internal resistance, capable of discharging at a max rate of 120a for a short period of time enabling it to sufficiently supply the device with its demand , such as a starter motor for example,
I think it's pretty obvious that trying to start a duff engine, the amount of cranking time and amps used would never be possible to equal the suspected theory that you could be cranking for one hour.
So it contains 120ah of energy, to enable it to discharge 120a for a short period....
No chance with a miss representing case.
 
billskip said:
I think the 120ah is just what it says. The misleading information is what people believe what it means.
A 120ah battery is , due to its design and internal resistance, capable of discharging at a max rate of 120a for a short period of time enabling it to sufficiently supply the device with its demand , such as a starter motor for example,
I think it's pretty obvious that trying to start a duff engine, the amount of cranking time and amps used would never be possible to equal the suspected theory that you could be cranking for one hour.
So it contains 120ah of energy, to enable it to discharge 120a for a short period....
No chance with a miss representing case.
Click to expand...
Sorry Bill, that isn't correct. The 120Ahr is it's capacity in total amps over time. Max current is on the spec sheet as CCA (cold cranking amps) and would typically be 800 amps or greater for this size battery and this depends on it's internal resistance.

The battery would empty in under 10 mins at that discharge rate. If it didn't boil first.
 
wonkywinch said:
Sorry Bill, that isn't correct. The 120Ahr is it's capacity in total amps over time.
Click to expand...
I agree...120Ahr is its total capacity, I said that, when you get down to the last 500ma I very much doubt you.will have 12v, so shazz77 could pick on that as miss representation,
If you buy a 120 ltr tank of compressed air at 50 psi it wouldn't supply 120ltrs of air at 50 psi.... its what is interpreted from the information that is either realistic or as in Shazz77 a miss understanding. (believing it to be miss representation).
 
billskip said:
I agree...120Ahr is its total capacity, I said that, when you get down to the last 500ma I very much doubt you.will have 12v, so shazz77 could pick on that as miss representation,
If you buy a 120 ltr tank of compressed air at 50 psi it wouldn't supply 120ltrs of air at 50 psi.... its what is interpreted from the information that is either realistic or as in Shazz77 a miss understanding. (believing it to be miss representation).
Click to expand...
Sorry to pick you up on this, you said that the 120Ahr rating meant it could deliver a max rate of 120A. This is not true. And even if on it's last legs, with only half an amp trickling into your load, I bet your power meter will reveal that you have discharged your 120Ahr from the battery. At a nominal 12v, that would be 1,440 watt hours total capacity whether that was delivered at a rate of 800A or 500mA.

From a typical 120Ahr spec, the battery will be considered fully discharged when it's voltage is 10.5v and fully charged at 12.73v, so the 12v spec is nominal. I can't find the discharge curve but it won't be a straight line and the total energy, volts times amps times time you can be pretty sure will be 120A x 12v = 1,440 watt hours with a load that takes a fully charged battery down to 10.5v.

If it didn't then there may be a case to argue.

EXV135 Enduroline Calcium Marine and Leisure Battery
 
You must log in or register to reply here.

Share this page

Top