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      10-30-2010, 09:02 AM   #80
Second Lieutenant
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Drives: E90 325i ZSP, F30 320i ZSP
Join Date: Oct 2006
Location: Pembroke Pines, FL

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I'd like to chime in on why you probably need to register AGM...

AGM (absorbed glass mat) have an advantage compared to SLA (sealed lead acid) in that they lose less electrolyte in hot dry climates and they vent very little gas. However the technology has a disadvantage to SLA in that they have a higher internal source resistance and therefore less CCA (cold cranking amps) than SLA. Therefore you get larger voltage drops than you would with SLA. Methinks this is the reason for the registration process. To "register" the voltage drops somehow? I may be wrong just my educated guess...