Battery issues

[Spencer87]

Okay. So... Quick question.
I have a pair of LG (Maybe HE2?)
Anyways the red ones that are 2500Mah 25 CDR
Married since birth.
Used them every second day since around marchish, Cant really remember.
Anyways, They have been married, Although when I pop them in the charger, I noticed usually one appears a little more charged. And sometimes when I wake up after having charged them, One finishes charging about 15-30 minutes after the other.
should I toss these then?

 

[TheKman]

They're use together in parallel? If so I find your first observation very strange. In series this isn't so strange, probably just a variation in capacity.

It's possible the charger isn't perfect also... Hard to k ow without some more systematic data.

As an aside, I habitually label my cells so I can identify any suspect cells and test them. Would be good to know if it's the same cell causing concern, or perhaps the same port in the charger.

 

[SupplyDaddy]

It is common for even parallel use batteries to be discharged unevenly. The contacts in your device may not be set in perfectly. Try rotating your batteries in the devices slots to see if you can get the discharge rate evened out. Like Kman says, mark your batteries so you can tell which is discharging faster and change the slots you use each in.

 

[Baditude]

LG HE2 18650

This? ^ (By the way, these are 20 amp CDR)

What mod are you using these in? In parallel or stacked inline? Might make a difference what order you place them in the mod by alternating the order they are placed in the mod (inline). The battery closest to the atomizer might become drained harder than the other battery.

 

[Spencer87]

Hey
Sorry they are used in series.
Sigelei 150 Watt.
And I have never really worried about which direction they go in, so I've just placed them in whatever way.

 

[TheKman]

That all makes sense now. What sort of variation are we talking about? Give me an example voltage for each cell the next time you charge them.

If the variation is greater than 200mV when they're below 3.5v this constitutes replacement in my view.