inputs.text: great think works - works great think least car batteries dont last beyond 1 year due several deep unintended discharges car stereo electronics charging car parked happens less 10 times year last time happened 1 week agoi carry pac2500 jumpstarting car twice used jump start someone elses ctek 3300 supposed help health battery increasing lifetimeit smart charging process described manual opposed dumb brute force charging alternator car running ctek 3300 first manual description uses constant current 33 amps 08 amps use smaller sized battery 14amp hours ar 3 settings set either 1 08h 10amp hours 2 regular car battery 1450 amp hour kind 3 snowflake third choice temperatures 41 degrees fthe charging starts constant current 33 amps certain voltage reached supply changes constant voltage varrying current certain voltage reached pulsing bursts currentvoltage performedall supposed increase usable volume battery bring usable part battery 90 less whereas usual volume would quite lessdoes work one measure maybe using device measures abilities feel like something preventively accidental discharge point not able start carread instructions stress importance hooking first terminals changing setting 3 choices applying ac power say not look battery directly hook ac powermy current battery got new march 25 power depletions beyond point able start since carry pac2500 jump starter past 2 years not memorable even happens not intend combined time 20 hours charging across 36 hours reached green light charged ctek3300 interrupt unit gets hot use normal deal transformers converting ac wall power dc power used batterythis charger lead acid batteries 290ah amp hours