Blown engine or bad battery

I know my car needed battery sooner
or later I was driving temp never went
up didn't smoke or run hot car
started declining speed n like shut
down couldn't open or close
windows or move seat after short
period sitting there no smoke or
nothing tried instant jump start it but
small jump box and car dash lights
came on n tried turn on but not
enough power to battery I believe so
charging jump box blown motor or
battery just had oil change last
weekend n I always took care of
checking fuilds