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You really don't want to trickle charge li-ion cells...

104.12.45.20

Chris Garrett

In Reply to: RE: How to find Trickle Charger for LiFePO4 batteries (3.3V versions)? posted by chopper87@aol.com on December 03, 2015 at 10:54:38

LiFePO4 are nominal 3.2v cells that can come hot off the charger at ~3.6v, so keep that in mind.
Once any lithium-ion cell reaches its correct CC/CV state of charge (3.6v, 4.2v, or 4.35v,) the charge should be terminated. They're not NiMH, or Ni-Cads that can stand a maintenance (trickle) charge.
It can be unsafe.
If you don't know much about li-ion cells and chargers, you can kind of puruse this forum linked below.
RC forums are another good source, but those guys routinely explode their packs in a hurry to charge them back up, so they're probably not the best guys to follow when charging for a home HiFi component.
Chris

Li-ion stuff. (Open in New Window)

Edits: 12/03/15

Follow Ups:

RE: You really don't want to trickle charge li-ion cells... - chopper87@aol.com 12:04:44 12/03/15 (2)
Thanks for the info Chris.

Lance A
- RE: You really don't want to trickle charge li-ion cells... - jkeny 14:55:47 12/04/15 (0)
  Lance, I know you are getting conflicting advice but please take note - a LiFePO4 charger will charge the battery to 3.65V
  
  The max operating voltage of the chip (& probably the oscillator clock) in the Regen is 3.6V.
  
  I will say this again for the last time - This is not recommended!!!
- I don't design cells, or chargers, but... - Chris Garrett 12:26:27 12/03/15 (0)
  I do have a lot of lithium-ion cells and chargers here for my various flashlights and have learned the safety concerns over the almost 4 years of playing with them.
  
  LiFePO4 is a safer chemistry than both the older LiCoO2 (cobalt oxide) and LiMn2CO4 (manganese oxide.) We now have hybrid chemistries that are using nickel, aluminum and other combinations that are between the cobalt and Iron chemistries when it comes to thermal runaway temperature, resulting in venting with flame.
  
  Trickle charging just isn't something that li-ions like, so don't do it.
  
  Chris

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