That’s not been my experience with the chargers I have, but I guess your experience has been different.
Yeh, that looks like the display and/or connector.
The leftmost “CHARGE” is “faded” towards the outside on the left, and the rightmost “CHARGE” is “faded” towards the outside on the right, ie, both nearest the edges.
Might be unglued or separated or something.
I’d try a run-down cell and just pop it in to automatically charge. Wait overnight, see if it comes out at 4.20V or so. If so, the innards would look to be good but the display’s hosed. Could still then be used as a generic charger as long as you don’t need any of the other functions.
But, that’s just me…
Charge works, at least with NiMH, still flawless.
But use it for other jobs is hard if you don´t see what you selecting
The charger itself or the cells warm it up?
TBH, at least my Nitecore UMS4 gets hotter than I would think it´s normal with 2x 2A NiMH D/C-cells. Dunno what happen if I would charge 2x2A with LiIon
However, my other chargers, except the very small AAA/AA-charger, usually don´t have this problem
Well #2 bank has 666 in the display so think that is the sign, She’s Possessed!
Tear the sucker apart if you have not already. Push around see if anything seems loose or if you see any cold solder joints, hot spots etc.
I’ve had 2 of these Opus 3100 and they have worked well for me. Still use one pretty much every day, stays plugged in.
First one I replaced the fan with a better one from Fasttech but they are not around anymore. Someone else here may know where to get that same fan as it was sold other places as well.
Could just have a bad ground inside as well,
Anyway good luck.
I’m giving mine the biggest workout it’s had in quite a while.
Got one of those bugzapper tennis racquets, and found that the momentary button got stuck on and cooked a pair of NiMH cells. One was at 0.2something V, and the other must’ve been driven negative, as the Ope didn’t even recognise it was in the slot.
So I gave the superdead one a few Frankenstein jolts with a Truly Dumb Charger to hit it with 4.2V spikes a few times. Eventually got enough decent charge for the Ope to start charging it. Both of them cooked up okay, and I’ve been frying flies left’n’right after one of my geniuses here ripped holes in the screen in back. Trap the target against the screen and keep frying it so that it sizzles and smokes. Then dump it into the sink and squoosh it into a gooey paste with a paper-towel. Otherwise those f’ers can sometimes revive in seconds.
So, those 2 cells are cooked and working fine in the racquet. Grabbed some loose 18650s and topped 'em off from the low 3s. All done. Working cells, so no need to cap-test them.
Aha, got a pair of 21700s that I never charged, so am doing a capacity test now on both.
I got the Ope propped up a bit for 2 reasons: to let hot air naturally convect up’n’out so the fan doesn’t get heat-stroke, and just to be able to read the display without leaning practically on top of it.
Both 21s are discharging now at 1A each, so that’s pure resistive and the fan’s doing a decent job sucking hot air out of it. Surprisingly quiet, not the usual Angry Bumblebee it usually sounds like.
So yeah, that’s generally why it’s still my go-to charger. It hasn’t yet let me down.
1 Thank
Yeah, some wall chargers with integrated power switching can heat even more, working at limit of bournout like cheap overdrive Led bulbs.
And heat isn’t good for both, charger and battery
That´s true, but most chargers don´t have active cooling.
Tried it but don´t help. So I would not use it any longer for normal charging, maybe only to revive some over discharged NiMH