There was time when you could refill 5 times/20 day 25% OR 50% OR 100% OR 250% of your energy. What happened? I observed that for a time now this option is not available like it used to: FREE of charge. Anyone has any idea about this feature?

No actually, I have no idea what they are talking about.
One thing on screen is the Friend Packs, but there are 6 Six of them (5 small and 1 large) and those are 20%, 20% 20% 20% 20% and 100% of your Energy. They are there, as always. And like Alexis said perhaps most of your friends no longer diligently play the game anymore. I know mine used to all be filled in mere minutes of turning red, now some take hours, if I bother to care about them. But with nothing new for a while I have not used Friend Packs in weeks.

The other thing right there is the ability to buy from the Store, the quick energy bar. That too is still right there. But those are not limited to every 20 hours, they are only limited to your cash availability. You might have to click the tiny little triangle to make it appear. But it will appear on its own when you have near zero Energy.

Something else, but not right there, only available in the Store and near Sasha, is the ability to buy for Gold and Gems small amounts of Energy, and that IS limited to every 20 hours. That's from 25 to 500 Energy,

Perhaps your browser has blocking ability for specific screen things and YOU blocked those items from being displayed onscreen.

Other than that, like I said above, I have no idea what they are asking.

...what?? I am now confused...

Veress, there are 8 ways of adding energy:

1. Gaining energy over time. The amount depends on your level. The time rate depends on what options you may have purchased.

2. Level up. When you level up, your energy is automatically filled to the new max energy for the new level. If you are a member of the BW Club, the new max energy is added to your current energy (IF you purchase the option from the BW Club vendor).

3. Fruit whacks. Really nice is if you can get fruit on a multiplier.

4. Friend energy paks. There is 1 at 100% and 5 at 20% each (plus one from the BW Club at 20%, if you are a member).

5. Buying fruitbakets at the general store, paying for them with gems and gold. Your choices are:
----small fruitbasket (25 energy - cost 10 gold & 1 agate)
----medium fruitbasket (75 energy - cost 100 gold & 2 aquamarines)
----large fruitbasket (125 energy - cost 500 gold & 2 topazes)
----huge fruitbasket (250 energy - cost 1000 gold & 2 sapphires)
----massive fruitbasket (500 energy - cost 2500 gold & 2 rubies)

6. Buying energy drinks from either the general store or the quick energy store (pop-up) at the bottom of your screen, paying for them with bushbucks. Your choices are:
----tiny energy drink (25% energy refill - cost 4 bushbucks)
----small energy drink (50% energy refill - cost 6 bushbucks)
----medium energy drink (100% energy refill - cost 11 bushbucks)
----large energy drink (250% energy refill - cost 26 bushbucks)

7. Winning bread in the auction house, paying with store-won gold. All bread loaves are worth a 100% energy refill. The cost depends on how high the auction goes.

8. Some of the various contests, mini updates and seasons quests have offered energy boosts on occasion. Those are rare, and short-term.

There has never been another way to add energy for "free," except for the ways mentioned above.

Not confused, and I'm talking about this:
Buying energy drinks from either the general store or the quick energy store (pop-up) at the bottom of your screen, paying for them with bushbucks. Your choices are:
----tiny energy drink (25% energy refill - cost 4 bushbucks)
----small energy drink (50% energy refill - cost 6 bushbucks)
----medium energy drink (100% energy refill - cost 11 bushbucks)
----large energy drink (250% energy refill - cost 26 bushbucks)
For a period of time it was free. I clicked 5 times/20 hours i'm sure, cause i bought 2*5energy packs/day. I'm clicked for 50% just as a try and although it said it costs 6 BushBucks i got it for free. Same with the other energy drinks(25%, 100%, 250%). NO Bush Bucks paid whatsoever.

Hi5 player perhaps? There are a few differences there I think.

There are no differences that matter if you are from Hi5.
What he is describing is a glitch if it ever happened. Or it's like Alexis said he spent a lot of BB's not realizing that he was.