loses battery charge very quickly,multiple times have to have

I bought this car thinking it would be reliable, yet even when still under warrently and the 60,0000 mile final check cost me 800.00 dollars Mike Shaw / Ryan said the battery tested fine,,, maybe low on water seriously even the Fellow from subaru roadside Assistance, said he has had to jump multiple Subaru's x 7 all forresters what the hell is wrong with the battery,should I not drive with my lights on . I went into the postoffice today for 3 min,left keys in ignition came out no start....nice fellow from subaru assistance came 45 minutes later and jumped ...started right up, everyone says its not the battery, what the hell is wrong with subaru!!!:(I bought this car to have few recurring problems my 2000 was better so angry everyone should know this is total sh*t....also sending Consumers reports a message everyone should know this is sh*t!