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--- electrical:12v:drop-in_lifepo4 [2024/04/12 23:02]
frater_secessus [bluetooth]
+++ electrical:12v:drop-in_lifepo4 [2024/06/19 19:36]
frater_secessus [chargers]
@@ Line 85: / Line 85: @@
 Lithium can famously accept huge amounts of current;  this does not mean it is //good// for it to do so.
-  * Maximum((max for our drop-ins; EV packs can have much greater throughput)) - 1C (100A for 100Ah battery)
+  * Absolute maximum((max for our drop-ins; EV packs can have much greater throughput)) - 1C (100A for 100Ah battery)
-  * Manufacturer recommendation - ≤0.5C (≤50A for 100Ah battery)
+  * Manufacturer recommended maximum - ≤0.5C (≤50A for 100Ah battery)
-  * cycle rating (longest life) - 0.2C (20A for 100Ah battery)
+  * recommended / cycle rating (longest life) - 0.2C (20A for 100Ah battery)
 Lithium does not have a minimum charging current in the lead-battery sense.  Charge as slow as you like.
+If you choose to end Absorption based on current, you might start out with [[electrical:12v:battery_capacity|0.05C]] and see where that gets you.  Adjust as needed.
 === voltage ===
@@ Line 280: / Line 281: @@
   * to top-balance cells((to the degree this works))
+==== myth:  lithium batteries draw the full current until they are almost full ====
+  * both lead and li chemistry charge acceptance [[electrical:12v:directcharginglfp#current_demands_of_dc-dc_chargers_vs_isolators|will taper]] when charged by a [[electrical:12v:alternator|relay/isolator]], and
+  * both will charge ~at [[electrical:12v:b2b|a DC-DC charger]]'s rated output until Absorption voltage is reached
+If we observed closely we //would// see some differences:  the LFP taper is shaped a bit differently, and that lead Absorption tends to start earlier and last longer.
 ==== myth:  if you don't charge to 14.4v the cells won't balance ====

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