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--- electrical:12v:deep_cycle_battery [2020/12/03 19:15]
frater_secessus [premature failure]
+++ electrical:12v:deep_cycle_battery [2021/05/01 15:04]
frater_secessus [AGM]
@@ Line 25: / Line 25: @@
 ===== premature failure =====
+Lead batteries tend to lose capacity very gradually over time, and are typically replaced when they only have 80% of their rated capacity. If a dying battery still meets your needs feel free to [[electrical:severe_battery_use|use it until it croaks]].
 Lead batteries can fail prematurely from [[electrical:batterycide|abuse and/or undercharging]] (usually gradual), or physical failure like cells shorting out (usually sudden).  Shorted batteries will tend to overheat when charged/discharged.
@@ Line 139: / Line 141: @@
 This type of VRLA battery stabilizes the electrolyte in an Absorbent fiberGlass Mat (AGM).
   * PRO
@@ Line 160: / 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 ====
-This type of VRLA battery gelatinizes the electrolyte with SiO2 (silicon dioxide) to stabilize it.  While renowned for their duty cycles, they are rarely used in campers due to cost, limited charging max similar to flooded((C/5, https://www.trojanbattery.com/pdf/datasheets/Motive_T1275-AGM_DS.pdf and https://www.qsl.net/wb3gck/gel-cell.htm)), and sensitivity to overvoltage.
+This type of VRLA battery gelatinizes the electrolyte with SiO2 (silicon dioxide) to stabilize it.  While renowned for their exceptional duty cycle life, they are rarely used in campers due to cost, limited charging max similar to flooded((C/5, https://www.trojanbattery.com/pdf/datasheets/Motive_T1275-AGM_DS.pdf and https://www.qsl.net/wb3gck/gel-cell.htm)), and sensitivity to overvoltage.
 "Lead crystal" batteries may actually be gel, since they claim the electrolyte is made of SiO2.((http://azimuthsolar.ca/getting-silicon-dioxide-sio2-batteries-charging-instructions/)),((https://www.solarpaneltalk.com/forum/solar/the-pros-and-cons-of-solar-energy/22713-why-are-there-no-lead-crystal-battery-distributors-in-the-usa-or-canada?p=272482#post272482))

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