hutcheezsad2 Posted September 19, 2004 Report Share Posted September 19, 2004 Just got the MZ-NH700 and i had a MZ-R55 before that - same problem on both. On both machines u start it charging by pressing "Stop", so when i plug in and its says "Charging" i leave it - naturally, then i come back in a few hours and the screen is blank - its finished chargin yeh? - Not so when i press "stop" again it says "Charging" again - what the hell?! When does it stop charging - as in how do u know if the battery is full? Quote Link to comment Share on other sites More sharing options...
Bananatree Posted September 19, 2004 Report Share Posted September 19, 2004 When the screen turns off, it should be charged. Pushing stop again will try add some juice to the battery as the rechargable cell can never be fully charged. So the unit will always try and give it some juice. I suggest against hitting the charge button after you've charged it up as this could lead to over charging and killing your battery. Quote Link to comment Share on other sites More sharing options...
aeriyn Posted September 19, 2004 Report Share Posted September 19, 2004 Nickel Metal-Hydride batteries are not "smart" batteries like Lithium-Ions are. They charge for a specified amount of time as determined by the device charging them (either a standalone battery charger or an MD unit itself). The unit actually doesn't "know" when the battery is fully charged. This is why it's bad to put a NiMH in the charger when it's not completely drained or mostly drained; the battery becomes slightly overcharged and a memory effect shows up. Quote Link to comment Share on other sites More sharing options...
doclloyd Posted September 19, 2004 Report Share Posted September 19, 2004 OK, so here's a question from someone going from lithium ion to NiMH... how close to the end of a battery's charge is it safe to recharge? One bar on the display? Two bars? I have a NH900. Should I deliberately kill the battery by playing a disc continuously once in a while? Quote Link to comment Share on other sites More sharing options...
What Happend Posted September 19, 2004 Report Share Posted September 19, 2004 Yes, NIMH batteries are not smart batteries like some Lithium but good chargers don't use time to determine when charging is complete. The good charges like all the fast chargers use charging IC that are based on delta V and delta T (voltage difference over time and temperature difference over time.) Temperature is not always practical for separate cells so they rely on the voltage change over time. Battery packs (like laptops use) contain thermistors that are feed to the charging IC to provide the delta T input. Trying to charge a fully charged battery will slowly over charge it. But since the IC is able to detect this condition the charge should stop in a few minutes. As long as the battery is completely cooled down before attempting to recharge and you don't do attempt this like 20 times in a row no damage should be done. NIMH batteries don't need to be drained completely to avoid memory effect. You just have to fully cycle the battery once every 30-60-days and any temporary capacity loss will be undone. Always draining a battery before charging (like letting a disc play and not listening to it) will prematurely wear out your battery. Nickel Metal-Hydride batteries are not "smart" batteries like Lithium-Ions are. They charge for a specified amount of time as determined by the device charging them (either a standalone battery charger or an MD unit itself). The unit actually doesn't "know" when the battery is fully charged. This is why it's bad to put a NiMH in the charger when it's not completely drained or mostly drained; the battery becomes slightly overcharged and a memory effect shows up. Quote Link to comment Share on other sites More sharing options...
Bananatree Posted September 19, 2004 Report Share Posted September 19, 2004 We've gotten so many different ideas on this subject I just have no idea who to belive. :frustrated: Quote Link to comment Share on other sites More sharing options...
Tiesto Posted September 20, 2004 Report Share Posted September 20, 2004 We've gotten so many different ideas on this subject I just have no idea who to belive. :frustrated:Perhaps this helps: http://www.powerstream.com/BatteryFAQ.html ...or confuse even more :rasp: Quote Link to comment Share on other sites More sharing options...
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