Search found 410 matches

by Mark
Wed Dec 07, 2016 10:20 pm
Forum: Ultimate Dream Charger/Analyzer
Topic: Features I think would be usefull - now or in future.
Replies: 7
Views: 1568

Re: Features I think would be usefull - now or in future.

The voltage is measured both during charging and like yours, during a "brief off-charge", or in my case a 1.5 seconds discharge So it does use discharge during charge. I don't recall reading that in the forums here. Super. Paul's original firmware did do that, but my firmware just pauses ...
by Mark
Wed Dec 07, 2016 1:47 am
Forum: Ultimate Dream Charger/Analyzer
Topic: Features I think would be usefull - now or in future.
Replies: 7
Views: 1568

Re: Features I think would be usefull - now or in future.

Unfortunately, the page that you linked to doesn't actually provide any reason to believe that it's much more than just someone's opinion. At best, it was written before low self discharge LSD cells existed. The claim that the coulometric efficiency when charging NiMH is only 67% is completely false...
by Mark
Tue Dec 06, 2016 11:27 pm
Forum: Ultimate Dream Charger/Analyzer
Topic: Features I think would be usefull - now or in future.
Replies: 7
Views: 1568

Re: Features I think would be usefull - now or in future.

The UltraSmartCharger already does a lot of those things. To be honest with you, I'm dubious about a lot of the things that you're suggesting that the charger doesn't already do. Do you have anything that you can point me to that indicates a benefit to any of your specific suggestions that aren't al...
by Mark
Tue Dec 06, 2016 11:23 pm
Forum: Battery Test Results & Reviews
Topic: Eneloops: 5000 cycles and still going...
Replies: 11
Views: 9716

Re: Eneloops: 5000 cycles and still going...

Any progress? Sorry - I haven't got to it yet... I have previously look at IEC testing methods - If I recall correctly, the biggest hurdle in implementing them is to maintain consistent room temperature. Another difficulty was that the testing that I was looking at was at relatively low rates and f...
by Mark
Tue Dec 06, 2016 11:16 pm
Forum: Battery Testing Discussion
Topic: Would this slow drain damage an LSD battery - or good idea?
Replies: 1
Views: 803

Re: Would this slow drain damage an LSD battery - or good idea?

I haven't done any specific testing with regards to this (although I have thought about doing testing) Based just on my own anecdotal experience, I would say that slow deep discharging NiMH cells can help to reduce IR and improve capacity on cells that have developed high resistance. The improvement...
by Mark
Mon Nov 21, 2016 11:14 pm
Forum: General Discussion
Topic: 2AA charger availabilty
Replies: 11
Views: 11218

Re: 2AA charger availabilty

Unfortunately, it looks like Paul has stopped selling the chargers - sorry.

It has been a while since I've been in contact with Paul, so I'll try getting back in touch and see if he's planning to start offering them again in the future...
by Mark
Sun Nov 20, 2016 10:36 pm
Forum: Ultimate Dream Charger/Analyzer
Topic: Features of the BQ-CC55 charger "peak sensing tech"
Replies: 1
Views: 4764

Re: Features of the BQ-CC55 charger "peak sensing tech"

Thanks for that - it looks like it's using pretty much the same method as the UltraSmartCharger!
by Mark
Mon Nov 07, 2016 1:42 am
Forum: General Discussion
Topic: How to keep NIMH cells from turning to the Dark Side.
Replies: 4
Views: 1078

Re: How to keep NIMH cells from turning to the Dark Side.

Yes, the cells are used in sets and charged together. The kids are too small to change the batteries in their toys yet, so I'm the one doing that.

All of my cells are labelled, so I can track how they're going and how many cycles they've been put through, etc.
by Mark
Mon Nov 07, 2016 12:37 am
Forum: General Discussion
Topic: How to keep NIMH cells from turning to the Dark Side.
Replies: 4
Views: 1078

Re: How to keep NIMH cells from turning to the Dark Side.

Working in the other direction, I think it's useful to look at what actually kills cells - and then try to avoid doing that. From my own experience, I would say that damage is done to cells at both high charge and low charge states - the actual damage done is possibly different in each case, but the...
by Mark
Mon Nov 07, 2016 12:28 am
Forum: General Discussion
Topic: Current status of NIMH knowledge re heat and %/C chargin
Replies: 3
Views: 2158

Re: Current status of NIMH knowledge re heat and %/C chargin

The way that the UltraSmartCharger works is to use high frequency PWM to step down the voltage (and increase the current) from power supply - the effective output that the cell should be seeing is a constant current with a little bit of ripple. I don't think that I've done any charging at 1400 mA, s...

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