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--- electrical:12v:deep_cycle_battery [2021/07/11 16:57]
frater_secessus [chain store batteries]
+++ electrical:12v:deep_cycle_battery [2021/09/28 16:45]
frater_secessus [LiFePO4]
@@ Line 163: / Line 163: @@
-Also see [[http://www.cheaprvliving.com/forums/Thread-Intro-Solar-Questions?pid=192023#pid192023|SternWake's advice on charging AGM batteries]].
+Also see
+  * [[http://www.cheaprvliving.com/forums/Thread-Intro-Solar-Questions?pid=192023#pid192023|SternWake's advice on charging AGM batteries]].
+  * this [[https://web.archive.org/web/20181024083504/https://www.practical-sailor.com/issues/32_3/features/Deep-Cycle-Battery-Test_5244-1.html|archived test]] of deep cycle AGM by Practical Sailor magazine
 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.
@@ Line 229: / Line 232: @@
 ==== LiFePO4 ====
 [[https://amzn.to/2oVGNWj|{{ https://m.media-amazon.com/images/I/61Z6qdh47cL._AC_UL320_SEARCH213888_ML3_.jpg}}]]
-In theory **LifePO4 (LFP) lithium batteries** should be near perfect for boondockers who [[camping:snowbirding|follow good weather]].
-[[https://amzn.to/2oVGNWj|Battle Born]] presently dominates the drop-in 12v lithium market.
-**Pro:**
-  * can accept significant current throughout charging, unlike lead-acid which accepts relatively current during [[electrical:12v:charging#absorption_stage|absorption]].
-  * can be cycled down to 80% [[electrical:depth_of_discharge|depth of discharge]] compared to lead-acid's 50%.
-  * higher number of rated cycles than lead-acid, perhaps 2000.((http://www.pbase.com/mainecruising/lifepo4_on_boats))
-  * half the weight, smaller size
-  * no mounting restrictions
-  * no venting required
-  * not rated over 20 hours like lead-acid;  LiFePO4 Ah are rated at .5C.((http://www.pbase.com/mainecruising/lifepo4_on_boats))
-  * 4S LiFePO4 cells are a good fit for nominal 12v systems.  They are fully charged at ~13.8v and 80% discharged around 12.6v.
-**Con:**
-  * much more expensive
-  * cannot be charged below freezing (use is ok)
-  * can be damaged by heat
-BMS-equipped LFP banks should be charged according to manufacturer's specs.  Bare cell charging is discussed [[electrical:12v:lifepo4_batteries_thread|on its own page]].
-Further reading:
+LiFePO4 drop-ins have moved to [[electrical:12v:drop-in_lifepo4|their own page]].
-  * [[electrical:12v:LiFePO4 Batteries thread|Synopsis]] of Cruisers and Sailing forums' LiFePO4 thread.
-  * CF [[http://www.cruisersforum.com/forums/f14/lifepo4-batteries-discussion-thread-for-those-using-them-as-house-banks-65069.html|LiFePO4 Batteries: Discussion Thread for Those Using Them as House Banks]]
-  * CF [[http://www.cruisersforum.com/forums/f14/lifepo4-batteries-okay-tear-me-apart-36530.html|LiFePO4 batteries]]
-  * CF [[http://www.cruisersforum.com/forums/f14/lifepo4-house-bank-using-smarthousepower-bms-40389.html|LiFePO4 house batteries]]
+LiFePO4 DIY info can be found on on Will Prowse's pages about [[https://www.mobile-solarpower.com/raw-lifepo4-deals-page.html|cells]] and [[https://www.mobile-solarpower.com/raw-lifepo4-deals-page-676969.html|BMS]], and in [[electrical:12v:lifepo4_batteries_thread|this distillation of a 10-year thread]] on the Crusisers & Sailing forum.

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