Li-ion Pcb Charger Not Working
Li-ion Pcb Charger Not Working
(OP)
I'm trying to charge 4 x #18650 4.2V 4.5Ah Li-Ion batteries. Like these:
http://r.ebay.com/zu9OjA
i'm using this charger:
http://r.ebay.com/6hk1Op
This charger does not appear to be working. Surely my own error. When i charge some good 18650's (not full, but have at least 3V charge), i do not see any of the batteries getting charged. After a couple hours, most of the batteries DROPPED a few tenths of a volt.
What am i doing wrong? Is it a mismatch between this board and the ultra fires? Or maybe these are just fake li-ions?
THANKS!
http://r.ebay.com/zu9OjA
i'm using this charger:
http://r.ebay.com/6hk1Op
This charger does not appear to be working. Surely my own error. When i charge some good 18650's (not full, but have at least 3V charge), i do not see any of the batteries getting charged. After a couple hours, most of the batteries DROPPED a few tenths of a volt.
What am i doing wrong? Is it a mismatch between this board and the ultra fires? Or maybe these are just fake li-ions?
THANKS!






RE: Li-ion Pcb Charger Not Working
Keith Cress
kcress - http://www.flaminsystems.com
RE: Li-ion Pcb Charger Not Working
the chip is one of:
S-8243A/B
S-8254A
S-8204A
S-8204B
S-8225A
S-8225B
S-8205A/B
(trying to determine which)
datasheets are here:
http://www.sii-ic.com/en/semicon/products/power-ma...
RE: Li-ion Pcb Charger Not Working
http://www.sii-ic.com/en/semicon/datasheets/power-...
http://datasheet.sii-ic.com/en/battery_protection/...
RE: Li-ion Pcb Charger Not Working
RE: Li-ion Pcb Charger Not Working
It showed your exact same setup on the ebay page with a 24V input supply...
Keith Cress
kcress - http://www.flaminsystems.com
RE: Li-ion Pcb Charger Not Working
"Input volt (between B+ / B- VSS-0.3~VSS+26 V"
see op
RE: Li-ion Pcb Charger Not Working
That's between B+ and B-, so that's describing the battery voltage, not the supply voltage.
You want: "Operating voltage 2.0 / 24.0"
Of course, this is just a linear charger, so no charging going to occur at 2V. 24V is a good place to be, but anything above 18V for 4 cells will probably suffice.
RE: Li-ion Pcb Charger Not Working
RE: Li-ion Pcb Charger Not Working
To discharge, i drove 3 computer fans in parallel off the pack. The controller properly turned off at about 3.5 V to prevent over-discharge. That's a pretty high cutoff, i've read the cells can be discharged to 2.5 V without problem. But future testing my prove me wrong about the behavior of this pcb.
On charging, the pcb stopped charging at about 4.1 V, a bit shy of the standard 4.2.
But hey, at least it works!
I had success with different brand cells than in my initial fail, which may have been the problem. The brand that worked is also an UltraFire knockoff-- one poster said you can get legit cells from some ebay outlets. More testing will be needed to determine how legit these are.
Thanks everybody for your comments!