Ø People also recognize that AGMs seem to last longer in the real world and now the AGMs are cheaper in the long run.
It deserves mention that one of the most significant factors that kills AGM batteries but is generally not an issue with flooded batteries is intolerance and inability to recover electrolyte capacity after excessive overcharging. Most AGM batteries do not provide a way for the end user to rehydrate cells after they have “vented”. The only ones I have ever seen that do offer this capability are the Hawkers, which have snap-off tops, with rubber caps on tiny cell access ports. It is fairly easy to rehydrate over-charged, vented cells in a Hawker AGM. This is not the case at all with the Optima AGM batteries…
Given that, many people have ‘killed’ their pack of AGM batteries well before they delivered the expected cycle life. This is particularly the case for those who didn’t invest in a BMS, but even with a quality BMS, the AGM still suffers from undercharging effects as with floodies, yet they cannot tolerate much in the way of an equalization charge to reverse the sulfation effects.
From: electricboats@yahoogroups.com [mailto:electricboats@yahoogroups.com] On Behalf Of Eric
Sent: Monday, November 14, 2011 10:22 AM
To: electricboats@yahoogroups.com
Subject: [Electric Boats] Re: Where to even start
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