After 1 night the cell voltages looks like this.
Yesterday they had 16-16.5v (checked in hds)

Morning the gauge shows empty, and after starting the car it starts to recharge ima bettery.


What do you think, should i try grid charging? Would it help?

 

09-11 HCH2 battery is the worst hybrid battery ever made. 06-08 is the second worse ever made.

All resting voltages at all times should be almost identical. 16.0 to 16.5 is already a bad sign.

I can't quite read the voltages, but it looks like you have readings in the 13.xx to 15.xx range. Horrifying. 14.40V resting is EMPTY.

Primary failure mode is a complete loss of ability to hold charge. That's what I'm seeing.

Concerning grid charging, you have nothing to lose. Your battery is shot. Either it will work or it won't. If you do attempt grid charging, it is critically important that you force air through the pack.

 

And what is your opinion about chinese cells?

 

They are inferior to the original Sanyo cells by a large margin.

Their warranty is completely meaningless.

Any purchase of chinese-made cells should be executed under the assumption that they will not last, nor will they have a meaningful warranty.