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Old 2018.11.26, 07:21 PM   #1
RFick73's Avatar
Join Date: Jan 2010
Location: Surrey, B.C., Canada
Posts: 432
Question Proper care & maintenance of your NiMH AAA's

So, this past weekend I was a little let down by the performance of some of my batteries. I bought the batteries about 1 1/2 years ago & use them typically once to twice a month or so year round. I'd say they have somewhere in the ballpark of ~50 cycles on them & that # is probably a bit high.

I currently charge my batteries in a SkyRC NC2500. The last few times I have purchased 5 sets of batteries, I have run them through the "Break-In" process labelled the batteries with their finished mAh & voltage levels. I then use that information to typically match them by mAh or by the voltage. What's the better way? I guess it depends on what I want. I used to be ALL about run time, but the brushless have an insane run time as it is, so I've been gravitating towards end voltage matching. I usually mark the groups with a letter or number & keep them together. Does any of this really matter?

It was mentioned that my care & maintenance may be the culprit, so, I wanna make sure what I have been doing is correct or change my bad habits.

Now, I swear I've read charging batteries at a lower amp rate is the way to go but is that the case? Maybe that's just for longevity sake? Do higher amp charging rates help with higher discharging rates. I really don't mind getting less cycles out of them if I get better performance, I know there has to be a tradeoff. I typically run my batteries & then store them for about a month or so until the next usage, at that point, because I'm in no hurry to use them, I charge them at .5amps. But seeing I only have 5 good sets & we run for like 8 hours, I typically run them, charge them & potentially use them again later that day.

I was asked how often I discharge my cells. Well, I don't.. Other than when I run them in my car. I knew it was a thing, but I've just never done it outside of my typical running the batteries through a 'Break-In" process every 6 months or so. The charger has a refresh setting, but I figured because I have the time, I would just use the Break-in process.

I typically bring 10 sets of batteries with me to the track. They are all the same but 5 sets are 3 years old, the others are all 1.5 years old. The set of 3 year old ones I really only keep in case others need a set to use or I really run low. I bring 2-3 chargers with me to the track so I can charge what I need how I need to. I try to go through the 5 newer sets & once I get to about the third set toss my original ones back in. I've often let them go at .5 amps or bumped them up to 1 or even 1.2amps if I knew I'd wanna use them sooner. What should I be doing, should I be discharging them first in the charger then charging up at 1-1.2amps? If I'm not using them should I discharge them, let them sit then charge them the day or two before using them? Should I be running them through the "Break-in" every 4-6 months or using the "Refresh" option more often?

What have others found worked for them? Help!
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