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It's not really about that - as I said right at the start of it this isn't the perfect way to charge batteries. I could have filled the breadboard full of FETs and temperature sensors, but this is about getting something that works and is useful in about the simplest way possible.
Do you have a link to any of that research? When doing this I had a quick Google, and the places I looked at didn't show any warnings about trickle charging with small currents - including Energiser's datasheet for their NiMH batteries.Energiser's datasheet recommends 0.025C or less, so 20mA is about spot on for an 800mAh NiMH AAA, and well under for a 2500mAh AA.Even so, as the whole charging process is written in JS code it'd be easy to tweak it to do whatever is considered right (I could change the code posted up here?). It would be better to have some extra hardware so it could do a faster charge at first though.
Not with this setup, no... The Espruino will only produce and measure up to 3.3v, and the batteries need around 4.2v. You could add some extra components to make it work, but to be honest it's probably safer to buy a special LiPo charger board - they're pretty cheap and reliable.
Smart Battery Charger (no s...View Instructable »
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