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RE: How to find Trickle Charger for LiFePO4 batteries (3.3V versions)?

108.29.0.9

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

You can get get the same charger below. I know Abe is trying to be helpful :( but IMO what you really want to do is just be sure your battery is charged then use a 3.3V linear supply to just keep the battery charged as was mentioned if you want to follow what was originally suggested. I actually had a DAC a friend built using an Acko board that is powered EXACTLY the way JK mentioned and it works EXACTLY as described.

Maybe just use a small adjustable regulated supply from Ebay.

http://www.ebay.com/itm/LT1083CP-Linear-adjustable-voltage-regulated-DC-power-supply-kit-DIY-/201352936200?hash=item2ee191fb08:g:qcMAAOSweW5VWxK0

This one is overkill up to 7A. Maybe get one that can provide at least 2A.
http://www.amazon.com/D4-Rechargeable-Batteries-EdisonBright (Open in New Window)

Follow Ups:

More precisely...................... - AbeCollins 22:42:15 12/03/15 (9)
Since you're splitting hairs here, I will too.

With regards to the LiFEPO4 battery, jkeny (M) said,

" You want the ones with tabs already welded onto the battery ends as it makes it much easier to solder wires to."

So the charger + available accessories that I mentioned should be a better solution. The battery charger you linked to will not fit batteries with tabs attached to them... unless you pry the tabs off which defeats their purpose. ;-)
- RE: More precisely...................... - chopper87@aol.com 06:50:18 12/04/15 (7)
  Actually,
  
  I ordered a pair of these batteries with the tabs. The tabs thickness measures 0.02 mm, and these tabs, as they are on my batteries should not interfere with the charger at all. Unless I am missing something?
  
  Lance A
  - RE: More precisely...................... - AbeCollins 07:36:42 12/04/15 (6)
    I don't know what charger you ordered so I can't say if those tabbed batteries will 'fit'.
    
    The charger I linked to would be used with a pair of alligator clips (Red & Black) so you would simply clip to the tabs for charging rather than trying to 'fit' the battery into a charger.
    - RE: More precisely...................... - chopper87@aol.com 10:55:50 12/04/15 (5)
      Abe,
      
      I think that I may order your suggestion as well. Who knows when or if my D4 charger will ever show up.
      
      Thanks
      
      Lance A.
      - RE: More precisely...................... - adam@denderapartners.com 11:27:43 12/04/15 (4)
        
        In Reply to: RE: More precisely...................... posted by chopper87@aol.com on December 04, 2015 at 10:55:50
        
        Chopper...nobody here seems to have addressed the real question here--why do you think you need a trickle charger on the lithium cells in the first place? Lithiums have about the lowest self-discharge of any of the cell chemistries out there. A charged lithium battery can sit on the shelf for a long time before you get significant voltage drop.
        
        Leave a well designed Li charger hooked up to the battery. It will come on when the battery needs charging, and be invisible to the circuit when not charging. It's all you need. I've designed many kinds of commercial portable equipment this way, and it's pretty foolproof...
        
        RE: More precisely...................... - chopper87@aol.com 12:33:39 12/04/15 (0)
        
        In Reply to: RE: More precisely...................... posted by adam@denderapartners.com on December 04, 2015 at 11:27:43
        
        Adam,
        
        You are absolutely correct with your point. I think that I will do just as you suggested and drop the "Trickle Charger" hunt.
        
        Thanks,
        
        Lance A
        
        Thank you... - Chris Garrett 11:34:14 12/04/15 (2)
        
        In Reply to: RE: More precisely...................... posted by adam@denderapartners.com on December 04, 2015 at 11:27:43
        
        it's probably about 3% a month, at worst.
        
        The problem that I see is doing both at the same time: powering the Regen and then seeing the voltage drop to the point where the charger needs to kick in.
        
        I don't know if it's kosher to drain a cell AND charge it back up at the same time, hence my recommendation of a battery cradle and spares.
        
        Chris
        
        RE: Thank you... - adam@denderapartners.com 11:40:09 12/04/15 (1)
        
        In Reply to: RE: Thank you... posted by Chris Garrett on December 04, 2015 at 11:34:14
        
        Chris I like that idea a lot. The other challenge with leaving the charger connected in an audio application is that you might well be introducing noise from the charger...not a problem in the optical particle counters that I design, but definitely something to consider here...
        
        You obviously have a more in depth knowledge than I about this stuff... - Chris Garrett 11:49:53 12/04/15 (0)
        
        In Reply to: RE: Thank you... posted by adam@denderapartners.com on December 04, 2015 at 11:40:09
        
        but I have learned a lot from people like you hanging out on the flashlight forums, where we use li-ion all of the time and sometimes upwards of 10A-15A per cell.
        
        We're now taking a back seat to the E-Cig guys and their 'sub-ohm' builds, where they can place 20A+ loads on single 18650s, but it's a neat 'hobby within a hobby.'
        
        I actually like talking about the batteries, cells and chargers more than the lights, lol.
        
        Chris
- RE: More precisely...................... - Bob_C 01:21:46 12/04/15 (0)
  You could just use batteries without tabs, then place it in a holder when it is fully charged. But actually you don't need the charger in my opinion, that is correct.

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