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--- electrical:12v:deep_cycle_battery [2019/10/01 12:38]
frater_secessus [Non-LiFePO4 lithium-ion]
+++ electrical:12v:deep_cycle_battery [2020/01/07 21:22]
frater_secessus [flooded lead acid]
@@ Line 37: / Line 37: @@
-Common setpoints (check your manufacturer's recommendation):
+Common [[electrical:solar:charge_controller_setpoints|setpoints]] (check your manufacturer's recommendation):
   * charge [[electrical:12v:battery capacity|C/10 to C/5]]((10A-20A per 100Ah of battery capacity))
   * Vfloat 13.2v when not deeply cycled;  13.8v when cycled daily
@@ Line 147: / Line 147: @@
 ===== lithium chemistries =====
+Lithium battery banks are lighter and have higher energy density than lead-acid batteries.  The main drawback is price.
+Lithium banks come in three main forms:
+  * "drop-in" batteries that are the same size and general voltage range as the lead batteries they replace.  Example:  [[https://amzn.to/2oVGNWj|Battle Born]]  BMS is built in.
+  * DIY banks, often "bare" cells 3.2v cells in [[electrical:12v:parallel_serial|4S]] configuration, with or without BMS.  These are not the same size or shape as lead batteries
+  * manufactured complete banks that do not mimic the physical shape of lead batteries
+==== BMS ====
+Because of the very high energy density and sensitivity to temperature and voltage extremes, most Li banks are equipped with a Battery Management System (BMS) which monitors and controls the bank and the cells in it.
+Depending on the BMS, features may include:
+  * protection from overcharging individual cells
+  * "top balancing" cells, getting cell voltages to match when fully charged
+  * protection from over-discharge
+  * protection from excess current in charging and/or discharging
+  * prevention of charging when temps are too low((typically freezing or below))
 ==== 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.
-In theory **LifePO4 lithium batteries** should be near perfect for boondockers who [[camping:snowbirding|follow good weather]].
@@ Line 180: / Line 207: @@
   * 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]]
 ==== Non-LiFePO4 lithium-ion ====
@@ Line 200: / Line 230: @@
 **Con:**
   * overcharging or physical damage can cause a runaway condition (ie fire)
-  * voltage mismatch - FIXME
+  * voltage mismatch of 3S to nominal 12v systems

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