PowerBook shuts down before sleeping

I've tried to find similar post on the forum but none of the answers I found worked for my particular case... hence this post !!
I've just bought a brand new battery for my Power Book. This battery is not Apple branded.
The battery seems to work fine as I can use my PB for 3-4 hours without any particular issue.
I've got the low battery warning message but when the battery is nearly empty, my PB doesn't go to sleep and shut down directly.
I've already done twice the calibrating of my new battery, reset the PMU several times,rerun the latest battery updater, checked the power savings settings ...
None of the above seems to have a positive effect as the PB is still shuting down instead of going to sleep when battery is very low.
Does anyone have an idea of what I could do else ?
Is it possible that the issue comes from the battery itself and not the settings of the PB ?
Thanks for any answer that could help me.
If anyone

Hi, brastoin. Was this one of the $40-60 counterfeit Apple-branded batteries one finds advertised in lots of places online? If so, I suspect the maker just left out some control circuitry to save money, hoping the buyer wouldn't notice or wouldn't mind. You don't always get what you pay for in a Powerbook battery, but if you pay little enough, you always get junk.

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