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electrical:12v:drop-in_lifepo4

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electrical:12v:drop-in_lifepo4 [2025/08/15 17:18]
frater_secessus [myth: you can't charge Li with a lead battery charger] USER 		electrical:12v:drop-in_lifepo4 [2025/08/28 15:17] (current)
frater_secessus [choosing a drop-in LFP battery] fleshed out
Line 55: Line 55:
 ===== choosing a drop-in LFP battery ===== ===== choosing a drop-in LFP battery =====
  
-There are many factors here which only you will be able to assess.+There are many factors here which only you will be able to assess. Basic due diligence will involve: 
 + 
 +  * reading and understanding the specs (see below) 
 +  * searching for youtube teardowns and testing on that particular model 
 + 
 +Shortcut:  Will Prowse has [[https://www.mobile-solarpower.com/lithium-batteries.html|a list of recommended, tested batteries]] which can be trusted.  
 + 
 +**Heads up**:  do not use lowest-possible-price as the main criterion for a battery unless there was a test/teardown available for it. 
  
 ==== voltage ==== ==== voltage ====
Line 89: Line 97:
  
 LFP cells can be damaged by overvoltage.  Charging is typically disabled when one or more cells rises to ~3.65v (~14.6vv for the pack) LFP cells can be damaged by overvoltage.  Charging is typically disabled when one or more cells rises to ~3.65v (~14.6vv for the pack)
 +
 +
 +=== low temperature (~freezing) charge cutoff ===
 +
 +[not present in all BMS]
 +
 +LFP cells are damaged by charging when the cells are at ~freezing temperatures.((discharging too, but the limits are much colder))
 +
 +Lack of **low temperature cutoff** is not necessarily a deal-breaker.  Maybe you live in a hot location.  Maybe your chargers have low temperature cutoff.  Maybe you externally warm your battery.  
 +
 +[[opinion:frater_secessus:self-heated_lifepo4|externally warmed vs. self-heated LiFePO4]]
 +
 +
  
 === high temperature charge/discharge cutoff === === high temperature charge/discharge cutoff ===
Line 107: Line 128:
  
  
-=== low temperature (~freezing) charge cutoff === 
- 
-[not present in all BMS] 
- 
-LFP cells are damaged by charging when the cells are at ~freezing temperatures.((discharging too, but the limits are much colder)) 
- 
-Lack of **low temperature cutoff** is not necessarily a deal-breaker.  Maybe you live in a hot location.  Maybe your chargers have low temperature cutoff.  Maybe you externally warm your battery.   
- 
-[[opinion:frater_secessus:self-heated_lifepo4|externally warmed vs. self-heated LiFePO4]] 
  
  
electrical/12v/drop-in_lifepo4.1755278325.txt.gz · Last modified: 2025/08/15 17:18 by frater_secessus

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