12V lithium pack with no balancing?

Most of these chargers do that and will slowly discharge the battery if left connected while not plugged in.

Big Clive

Noticed the led light came on when the charger was plugged into the battery. Does it back fliw to the plug terminals and if so how much did it affect the voltage output.

They're all standard protected cells. It may just have been cheaper to do it that way.

Big Clive

The charge current is regulated by the charger and equal through all cells.

Big Clive

Seems daft, all those separate little pcbs each with multiple chips & mosfets. Seems a single balancing chip would be cheaper - but cheap in China is different from what it is here in the west...

Gordo

If one cell did end up unbalanced and much lower than the others, wouldn't it charge faster and asymptotically approach the voltages of the others over time? Or would the per-cell regulators cause them all to charge at the same rate? Maybe another test to run - discharge one cell a bunch and then see how they charge.

George Dorn

I would expect the voltages to drift, not a safety concern but it would prematurely reduce the usable capacity of the pack in a daft way. Capacity is pretty crap but it depends on the price I suppose.

Matt Tester

not sure if the voltages will drift back and forth but it's a novel way the pack life is reduced.. using two cells to control max and min voltage... :)

Richard Boyce

The cells came in at 2,200mAh. So 12V at 2,200mAh or if cheating by adding all the cell capacities together 6,600mAh.

Big Clive

I wonder how the capacity test will work out? Did Clive blow it up and disturb the cats? ...again?? ;)

Michael Thompson

The risk of explosion increases exponentially in proportion to potential fault current and inverse proportion to safety features.

Big Clive

Remind me, when you connect potentially flaky Chinese cells in series do you multiply the risk of explosion by three, or divide it?

Phil Collins

very dodgey i have one like that which is just a 12volt output and dosen`t have anything in the circuit just switch ans led to say its on