look, if I'm not mistaken these are the same and use the bq24090 so there is an ideal manufacturer circuit in the datasheet: http://www.ti.com/lit/ds/slus968g/slus968g.pdf [img] https://adjuntos.yoreparo.com/imagen_post/0004/48/920682168bb2b16b2b6db2db2b2db1 img] 6 dollars leave here in Argentina, I don't know if it makes much sense to make it but well there I think you have data to do it ...