toner297

ok my problem started saturday morning.The night before my brother moved my car to save himself some park so on saturday morning when i tried to leave my battery was dead. so for the past two days ive been having to charge the battery till i get enough money to buy one.
id charge the battery and once i shut it off it was dead.so today i notice i was low on gas and went to the gas station to fill up and i knew once i shut the car off i had to use the jumpers to start the car but once i filled up the car started like it had a new battery.the help i need from anyone familiar with hondas is what do you think caused this the whole day today my civic has started up with no problems any guess on what it may be
thxs in advance