Late 2010 MBA 13" shuts down on empty battery

Late 2010 MBA 13" 1.86GHZ, 2GB RAM - Lion
On empty battery my MBA going to shut down instead of hibernate, and when I connect power cord I need to hit power button and it booted up like after normal switch off. Of course Lion keeps applications windows, but some apps and sites like Skype require paswords again.
I know MBA should sleep if I leave it without activity, but for some reasons it not happen every time what is caused empty battery.
Is it normal? How to fix?
Could someone check pmset -g on Late 2010 MBA 13" with Lion (please be sure your MBA on battery power when command executed) and tell me know hibernatemode value, maybe for some reason this parameter is incorrect on my MBA and it causes listed problem?
Also, I investigated that pmset -g displays hibernatemode 1, but man pmset explains that correct values for hibernatemode are 0, 3, 25
I have recognised that in folder /var/vm sleepimage file is exist, but as I have wrote on empty battery MBA going to simple switch off and switch on without restore state from hibernating.
I know it is possible to modify hibernatemode, but guess on MBA different power management system is used and better to know hibernatemode value from people who have no problem with MBA.
Could someone run in terminal pmset -g on Late 2010 MBA 13" with Lion (please be sure your MBA on battery power when command executed) and tell me know hibernatemode value?
Maybe for some reason this parameter is incorrect on my MBA and it causes listed problem?
Thank you in advance!

Take it in. Let them fix it. It's not normal for that to happen.

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