Why won't my eneloop charger charge other nimh batteries

Batteries and Chargers Chargers
1

I find that my eneloop charger will not charge my older Sanyo nimh batteries. When placed into the charger the charger stops after a few seconds. Why is that the case

Thanks,
Jerry

2

Smart chargers won't charge a cell if the internal resistance is too high. That could be what's going on.

3

Is that built into the battery or a result of age or??
I wonder if my Panasonic BQ 345A will charge eneloops. I will give it atry when I need to charge one.

Thanks,
Jerry

4

Mine were Sanyo 2100. I have also been disappointed with them.
Jerry

5

+1. Some years ago I tried a couple of sets of the 2700’s. Didn’t like them one bit.
Currently, I’m using THESE and THESE. No problems. So far so good. Use them in my Nikon speedlites (flashes). The eneloops are pretty good, too (some would say the best).

6

[I wonder if my Panasonic BQ 345A will charge eneloops. I will give it atry when I need to charge one.]

Yes.
Jerry

7

Some chargers won’t start charging if the voltage of the cell is too low (too much discharged).

8

I use a Bmax hobby charger, and it shows if the problem is to much discharge, and low voltage.
For some batteries I have managed to charge.

9

I found that my Panasonic BQ 345A will charge eneloops. It does take longer.
Jerry

10

This thread is a bit old, but if “smart chargers” won’t charge those old batteries, try putting them in “dumb” chargers for some time (about 30 mins to an hour perhaps?), then pull it out & charge em in your smart charger. If it was the voltage that got too low was the problem the procedure could fix that. If the problem is high internal resistance or impedance, then that’s another thing.

11

I’ve found that batteries that are too low to charge in a smart charger only need a minute or two in a dumb one to get their voltage up high enough to work in the smart one. Another way of doing this is to put a charged battery in parallel with the 0V to help bring the voltage up. That said, the chances are that the batteries have been damaged by being overdischarged and will have diminshed capacity and/or high self discharge.

Try charging them in the dumb charger and then setting them aside for a week or two before testing them for voltage and capacity. All of this is no good if high internal resistance is the problem; the only solution then is to recycle.

12

Elitism?

13

That charger has got a reputation to mantain :bigsmile:

14

those are quite old and probably tired.slow charge on a dumb charger and test.

15

I have a MH-C9000 smart charger. But having a lot op problems with my eneloop batteries. Most of my eneloops AA’s are 2 years old. The charger states that the internal resitance is to high and wont charge them. The batteries are not used often and are mainly laying around as backup. I could get some to charge by draining them a bit down. The claim about 2100 charge cycles is definitly fraud. My eneloops got maybe max 30 charge cycles! I am very disappionted about the eneloop batteries.

16

ouch!
clean the contacts on that charger.
it takes real abuse to kill REAL eneloops that fast.
counterfeits?bad charger?

17

fraud? do you know how they test them? I guess not..

18

The most likely fraud is getting fakes!

19

Since I discarded the old Sanyo I have not had any problem charging any nimh batteries. I guess they had just gotten too old and tired. I can relate to that.:slight_smile:
Thanks for all the comments.
HAPPY NEW YEAR TO ALL.
Jerry

20

Well, I’ve seen fake SonyCycle Energy with very high internal resistance they behave like alkalines. I doubt those Eneloops you mentioned are real, unless something’s wrong with the charger ow what-not.