I've got an 18v motor from a Black & Decker leaf blower. Instead of using their overpriced Li-Ion battery packs that only have 4Ah max, I'm going to try to daisy chain a bunch of these batteries instead:
Now, if I hook up 5 of these 3.7v batteries in series, the voltage would be 18.5v. This is pretty close to the 18v the motor is rated at, which seems like it would work ok. The problem is, that's the battery's general voltage. As I learned with a 4000Ah version of these batteries (also rated at 3.7v), the voltage fresh off the charger is 4.2v! It isn't 3.7 as one would expect. That would mean when I first start using the batteries from a fresh charge, the motor will get a whopping 21v instead of the recommended 18v. Is this an issue? What kinds of devices are used to overcome these situations? I've tried looking for voltage regulators, but I can't find one that handles more than 2Amps (I need a 5.15 Amp one). Thanks for your time!