My alternator died and my batterie does not seem to want to charge off the wall charger. Because it ran flat will I need a new one. There's a setting on the charger to charge sealed gell batteries. Are the silver calcium sealed gell batterie. Do I need to use this or is the battery toast. Thanks guys

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dont know much about batteries tbh.... a sealed battery is meant for no maintenance, ie no filling of distilled water to the cells, or you cannot put in the cell rejuvenating tablets...

my calcium is sealed yes, if i charge a battery i put it in the kitchen, on paper, with charger set to low, and charge over night..... well try to get approx 12hrs out of it.....

why did it run flat due to alternator? just because it ran flat its not toast, unless it has faults....

Lead-acid batteries don't tolerate being run flat and if the battery was already a few years old and past its best running it flat could well finish it off. In this article it states they shouldn't be discharged below 25% of their capacity so I would say it probably is toast. There are chargers around using pulse technology that claim to be able to recover heavily discharged batteries but I think these are primarily aimed at badly sulphated batteries. As described in the article heavily discharging a starter-type battery (as opposed to a deep-cycle leisure type) tends to cause mechanical damage - the lead paste falls out of the grids - so these are basically unrecoverable.

these are fitted with calcium batteries..... not lead acid.... if you fit a lead acid it wil/may cause electrical fault with in the smart charge system, and maybe the car.....

A calcium battery is a lead-acid battery type, see here, and is still subject to the conditions I stated.

I followed the link though that you gave and I was particularly interested to read that Calcium batteries have a shorter service life. I have bought Calcium batteries from Halfords (with the 4 year guarantee for years for my previous cars) and I have found that after 4 or 5 years they`re on the way out. Yet my wife`s old Fiesta had, I believe, an original Motorcraft battery which was still going strong 10 years later. I`ve never understood this before, maybe I do now.....

motorcraft batteries are silver calcium the ford smart charge needs silver calcium batteries thats a must so the options are 4 year 5 year or 7 year service life most are 4 years some last longer some dont depending on driving ie short trips

the replacement has to be silver calcium or the smart charge will not work and the battery will fry in a few months easily if a silver calcium battery has been run flat and its a reasonavble age it wont recharge

I guess it would depend on the manufacturer. Yuasa seem fine http://www.yuasa.co.uk/info/technical/silver-calcium-batteries/