Battery problem

[Idlogin]

I've just received a battery from Battery space for my iBlaast light.
It's a 14.8v 4800mAh Li-on 4 cell unit.
http://www.batteryspace.com/index.asp?PageAction=VIEWPROD&ProdID=3346

Only it doesn't seem to be working.

I've tested it with a voltage meter and I'm only getting a reading of 8.4v.

I've also tested the charger which is pushing out 16.8v when not charging.
http://www.batteryspace.com/index.asp?PageAction=VIEWPROD&ProdID=2488

If I connect the charger to the battery and test the battery while it's being charged I get a reading of 8.4v, as soon as the charger stops charging but still connected to the battery I get a reading of 16.8v from the battery.

Please has anyone got any advice.:mecry:

 

[Szemhazai]

Connect it to 10W 6V halogen bulb when after one hour voltage drops to 7,7V or something about that, you have 7,2 4,8Ah pack with wrong label...

 

[HEY HEY ITS HENDO]

............

It's a 14.8v 4800mAh Li-on 4 cell unit.

it should have 8 cells

 

[Hack On Wheels]

............it should have 8 cells

2 parallel pairs of 4 cells in series?

Perhaps they wired it oddly and made it 4 parallel pairs of 2 cells in series?? Or if it actually is 4 cell, then just 2 parallel pairs of 2 cells in series?

 

[Idlogin]

2 parallel pairs of 4 cells in series?

Perhaps they wired it oddly and made it 4 parallel pairs of 2 cells in series?? Or if it actually is 4 cell, then just 2 parallel pairs of 2 cells in series?

The pack does have 8 cells but I think it must connected up wrongly.

It's s strange that the charger stops charging as soon as hits 8.42v.

 

[Szemhazai]

The overcharge protection in PCB should stop charging at 8,4V if it is 7,2 pack.

 

[HEY HEY ITS HENDO]

......... time to send it back!
at the very least they owe you an apology and a full refund of your return shipping costs as well as a replacement battery of the correct spec.

 

[Idlogin]

Good news I have spoken to Battery space and they are sending me a new battery pack and I don't have to send back the faulty pack.

They conceded that it is probably a 7.4v battery so now i have a spare battery:thumbsup: which i could use to power an AYUP light for my other bike or as a head light.

Any thoughts as to how long the pack would take to drain given it has 8 cells?

 

[Szemhazai]

It should be 4 x 2,4Ah = 9,6Ah ayup takes about 500mA, so about 18 hours