Recently on AliExpress, eBay, etc... I've been seeing these lithium ion battery chargers consisting of a server power supply normally an HP DPS-750/1200 or very similar and they have a module connected on the outside which must be a CC/CV controlling device...

They're littered all over AliExpress. I searched all over Google and github and I can't find anything similar whatsoever.

I've also looked for the module itself for sale anywhere but can't find anything.

I was just able to find a picture of the internals and the PCB. It looks fairly simple. 1 IC, and a couple pots....

If anyone understands how this thing is working or know where to find any information or where to buy one please leave a comment below.

 

is there some reason why you don’t just use some other 12V input charger connected to the PSU instead of the mystery box?

 

@Yaakov

price. these server psu's and this module are capable of about 50+ amps. A stand alone lithium charger that's capable of that much current is very... expensive.

this entire setup is also very cheap but the only place to order it is from china and if you even receive it will take 2+ months

 

@Yaakov

price. these server psu's and this module are capable of about 50+ amps. A stand alone lithium charger that's capable of that much current is very... expensive.

this entire setup is also very cheap but the only place to order it is from china and if you even receive it will take 2+ months

I am skeptical concerning the 50A rating. There are many CV/CC buck-boost converters generally available but they seem to limit their claims to 20A/300W.

The server PSUs are all over eBay, too.