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--- electrical:12v:deep_cycle_battery [2021/04/18 17:32]
frater_secessus [Gel cell]
+++ electrical:12v:deep_cycle_battery [2021/07/11 16:42]
frater_secessus [chain store batteries]
@@ Line 141: / Line 141: @@
 This type of VRLA battery stabilizes the electrolyte in an Absorbent fiberGlass Mat (AGM).
   * PRO
@@ Line 162: / Line 164: @@
 Also see [[http://www.cheaprvliving.com/forums/Thread-Intro-Solar-Questions?pid=192023#pid192023|SternWake's advice on charging AGM batteries]].
+Historical note:  the original use for AGM was for long-term stationary floating on shore power for backup/UPS purposes, as one finds in industrial backups or in the bases of cell towers. In long-term stationary use the liquid electrolyte in flooded batteries can stratify, causing degradation.  The electrolyte in AGM(((and gel)) types cannot move freely and so will not stratify.  Telcos and other industries typically replace the batteries after X years on float duty and sell them on the surplus market.  They are not made for frequent cycling but still may represent a good value.
 ==== Gel cell ====
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-Having said that, if one is aware of the limitations of the battery it can play a role in the campervan, particularly as a "learner battery" that the [[electrical:batterycide|beginner often murders]].  Lifespan on these batteries can be maximized by cycling lightly, perhaps 20% [[electrical:depth_of_discharge|depth of discharge]].
+Having said that, if one is aware of the limitations of the battery it can play a role in the campervan, particularly as a "learner battery" that the [[electrical:batterycide|beginner often murders]].  Lifespan on these batteries can be maximized by cycling lightly, perhaps 20% [[electrical:depth_of_discharge|depth of discharge]].  They can also be used for people who are not away from shore power very long:
+> A drycamper's needs are quite different from the pedestal crowd. If heavily cycling a battery then most 12v jars are a serious compromise and require special charging treatment... The person who drives from [RV park] pedestal to pedestal and only occasionally camps without hookups might be well served by a 12v dual purpose battery... - landyacht318((https://www.rv.net/forum/index.cfm/fuseaction/thread/tid/28237856/print/true.cfm))
 **Pro**:  Local and 24hr availability in stores can be valuable.  Warranties are nationwide;  save your receipt as it is usually required.
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 **Con**: Significantly less capacity than a real deep cycle bank; a group 27 wally world battery has about 1/2 the Ah capacity.  Drastically reduced longevity when cycled to 50% DoD as with most campervan usage patterns.
+Further reading:  [[https://marinehowto.com/what-is-a-deep-cycle-battery/|this page]] with further explanation and teardowns to show the difference between deep cycle and "deep cycle" batteries.
 ===== lithium chemistries =====

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