Lifeline AGM and extreme temperatures?

They are more temperature resistant than flooded--but for longest life make sure any charger uses temperature compensation.

If Lifelines last years and years at underhood temperatures in ambulances at vehicle charging system voltages, then what say you to veritable battery paradise temperature and voltage wise?

The AGM temperature/voltage "kick" has gotten entirely out-of-hand on this forum. LIFELINES ARE LESS TEMPERATURE SENSITIVE THAN 5% ANTIMONY BATTERIES! I did not say VOLTAGE SENSITIVE. Imagine what happens to an AGM in Phoenix in July, underhood on a 120 degree summer afternoon. Yeah it's not going to live as long as a laboratory maintained AGM on float. But such a comparison twisted so make it sound as if the AGM is doomed, is worse than foolish.

Understand it clearly. Corcorde wants to brag it's expensive batteries have phenomenal lifespans. I tried to make float voltage maintenance have meaning on this forum by raising SG to maximum then reducing float voltage to absolute minimum to reduce maintenance current to next to nothing without having specific gravity start to slup. Lifeline, being perfectionists try to impress this philosophy upon customers without explaining PRECISELY how their philosophy fits into the overall scheme of reality. Their meticulous attention to detail just tickles me but the buying public adopts meticulous recommendations as gospel. Do not forget the same people who issue Mil-Spec bulletins and qualifications also construct user manuals for the public. Concorde demands their customers toe the line right to the millimeter. Other AGM companies have adopted a looser than a goose user manual. A German pre-war hunter's manual is a good parallel. It demands the shooter take an almost fencing grade degree of posture placing the feet, hands and fingers, just so. Remember, the game could care less, but etiquette demands it without compromise.

BuShips battery maintenance manuals for US submarines is similar. You would not believe the intense, rigorous level of goose-step grade maintenance and daily testing and proofing. Boats had to return to Mare Island to exchange batteries and the military demanded the crew baby those batteries as if their life depended on it.

This is definitely not an endorsement of going to extremes and getting sloppy with charging control - it is a reality check in which manufacturers of a premium priced product worry about images and perceptions. AGM manufacturing is not a lucrative profit endeavor, sorry, edeavour. Cost of materials, construction, and testing is pricey and profit percentage is around 150% that of a standard premium flooded battery. Remember base prices start at a higher figure. The quantitative production numbers are tiny compared to flooded batteries.

But skipping the purchase of an AGM brand because of a two-tenths of a volt disagreement between set maintenance charging voltage value and OEM battery recommendation, is just plain silly.

According to the lifeline manual they can be stored fully charged anywhere from -67f (-55c) to 122f (50c) They can be used in temperatures from -40 f&c to 160f (71c)

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