NiMH is a lot safer if you're building your own charging circuit. Lithium chemistry takes very careful charging and mistakes can burn your house down.
The best practice (if you're building your own voltage regulator) is to be sure that the battery output is not only above 5v, but enough above to prevent regulator drop out. You probably want to keep your battery voltage above about 6v if that's how you do the conversion. Lithium batteries are (nominally) 3.7v, so they get used with boost converters. Either way, remember that (before accounting for losses) V(in)*i(in)=V(out)*i(out). That works out to Watts in equals Watts out. So you want to determine the output wattage capability of your batteries. After that, you want to consider the total available energy in Watt-hours so you know how long your batteries will power your device. Beyond that, you'll want about 20% extra in both power and energy to account for conversion losses.
No matter what sort of wishful thinking people engage in, the Laws of Thermodynamics still hold. There is no free lunch.
The best practice (if you're building your own voltage regulator) is to be sure that the battery output is not only above 5v, but enough above to prevent regulator drop out. You probably want to keep your battery voltage above about 6v if that's how you do the conversion. Lithium batteries are (nominally) 3.7v, so they get used with boost converters. Either way, remember that (before accounting for losses) V(in)*i(in)=V(out)*i(out). That works out to Watts in equals Watts out. So you want to determine the output wattage capability of your batteries. After that, you want to consider the total available energy in Watt-hours so you know how long your batteries will power your device. Beyond that, you'll want about 20% extra in both power and energy to account for conversion losses.
No matter what sort of wishful thinking people engage in, the Laws of Thermodynamics still hold. There is no free lunch.
Statistics: Posted by W. H. Heydt — Tue Apr 16, 2024 3:13 am