my battery light back on on my 02 suzuki vitara

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had battery, starter and alternator checked at a parts house they said starter and alternator fine battery alittle low so we replace battery started car this morning for work let it warm up got in it to leave battery light back on wants to stall like before when i broke down a couple days ago it stalled and couldn't get started for about 15 minutes then it started as long as i kept foot on gas it keep running