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Hi,I picked up some flat Li-Ion cells rated 650mAh, made as replacements for the Nintendo DS.I don't know if the DS is on the way out, or the dealer had just over stocked, but I got them for around $2.50 a pop.I guess you could find similar offers in several web shops.Given the motors stall current, I'd estimate a run time of a couple of hours with such a 600mAh cell.
What is the most frugal way to charge a single cell li-ion battery?
Also is a single sell enough to power THIS? I read the data sheet but found it confusing.
I'd recommend you go with a charging circuit that Sparkfun already sells, as I personally wouldn't trust anything but an appropriate charger/charging circuit for Li-ion chemistries.
Also since the regulator you have chosen there will work with a 3.7V power source, as the regulator is Low Dropout, meaning you can put close to its output voltage and still have regulation.
Hi,Quote from: galannthegreat on January 30, 2011, 11:18:54 PMI'd recommend you go with a charging circuit that Sparkfun already sells, as I personally wouldn't trust anything but an appropriate charger/charging circuit for Li-ion chemistries.But you find it OK to use a LiPo charger for a Li-Ion cell Quote from: galannthegreat on January 30, 2011, 11:18:54 PMAlso since the regulator you have chosen there will work with a 3.7V power source, as the regulator is Low Dropout, meaning you can put close to its output voltage and still have regulation.There's LDO's and there's LDO's...This one has a huge drop out of more than 1V, so it won't even do when fresh out of a charger - and no battery cells stay at their fully charged voltage for long.