2003 Nissan Altima Q&A

2003 Nissan Altima Question: my 2003 alt will barely move after jumping mechanic said alternator was bad

the problem has occurred twice had it towed to a shop who got it started and ran fine after that he said the alternator was bad had it checked but was told it was ok had to jump it again it barely moves when in drive -
Answer 1
How old is the battery? Has it been tested? No bad cell(s)? -
Comment 1
its good its only 3 months old -
Comment 2
How was it tested? Even new batteries can be defective! -
Comment 3
alternator and charging system was tested on a machine -
Comment 4
Starting wityh a fully charged battery(assume 12.5 volts) turn on the high beam headlights (engine off), and let it sit for twenty minutes and re-test the battery.Might show a bad cell. -
Answer 2