In almost every case, using a PSU to charge batteries is a bad idea.

Charging lithium packs with anything other than a charger designed for the job is positively dangerous!

I am just changing thw psu part of the charger . The charging circuit is separate from it so.....

 

Charging lithium packs with anything other than a charger designed for the job is positively dangerous!

Actually with a properly set benchtop powersupply with current limit you should have no problems.

 

Actually with a properly set benchtop powersupply with current limit you should have no problems.

Do you think 1A is good for 3800 mAh battery pack ?only thing am worry about is how the charging circuit is going to react . the psu was a custom one and unfortunately lacks informations.

 

Actually with a properly set benchtop powersupply with current limit you should have no problems.

With lead chemistry; the bulk charging should be done at a fair bit above nominal voltage and then throttled back to avoid excessive gassing - a bench PSU doesn't even come close unless you constantly supervise and adjust. Even crude chargers just have deliberately poor regulation so the output voltage falls easily as the battery starts drawing charge current.

Nickel chemistry heats up as charge completes, and their negative temperature coefficient means the terminal voltage falls as they heat up - the very least you can get away with is a PSU with adjustable current limiting.

Lithium cells have a critical end of charge terminal voltage, with a steady hand you might adjust the output just so (assuming the meter is accurate) - if you charge series cells, you'd better make sure the pack has built in charge balancing!

 

I meant just for lithium cells, if you adjust the voltage with a voltmeter and the supply doesn´t drift too much, then all should be ok.

 

I meant just for lithium cells, if you adjust the voltage with a voltmeter and the supply doesn´t drift too much, then all should be ok.

The voltage is fairly critical - maybe a laboratory grade PSU with thumbwheels to set the output voltage.

It probably also requires current limiting for packs of series cells, just a guess - but I think the charge balancing circuitry is a shunt regulator per cell. This would have a maximum current rating that would be unwise to exceed.