The ten-minute triage: jump start, recharge or replace
Those three numbers produce a clean decision. A healthy battery that went flat because a door was left ajar needs a jump start and a proper 30-40 minute drive, or better, a bench recharge, not a replacement. A battery over two years old that fails the conductance test needs replacing even if it started the car today, because the next failure will not announce itself. And a brand-new battery that keeps dying points at the car, not the battery: a weak alternator, a failing voltage regulator, or a parasitic drain such as a dashcam hard-wired without a cut-off, an aftermarket alarm, or a boot light that never switches off.
Insist on seeing the numbers before agreeing to a swap. Any competent mobile technician carries a conductance tester and will show you the printout or screen without being asked. If the verdict is a drain rather than the battery, a parasitic draw test with a multimeter in series takes another 20-30 minutes and saves you replacing a good battery twice.