I've built a charger for my batter (NiMh 6-cell 7.2v) using MAX712 IC.
The problem I'm facing is that it's in a linear mode which requires either a huge heatsink or a heatsink with a fan (9W). See my previous question - MAX712 charging circuit - diode gets too hot
The charger has to be a part of a robot, so size does matter.
I was looking at using MAX712 in switch-mode, which is possible, but requires substantial work:
Someone suggested to use DS2715 instead which is switch-mode natively.
This charger uses temperature change (Dt/dt) for detecting charge termination instead of voltage drop that MAX712 uses. My battery doesn't have a thermistor built-in.
So my questions:
1. Can I just glue thermistor on top of the battery pack so it would allow me to use DS2715?
2. What is a better method - voltage drop detection or temperature change (Dt/dt)?
3. Any other battery charging ICs I should consider?