We are building a blinkey-blink circuit for a bicycle and not sure what battery to use.
- The circuit will need to run on about 5V, since is is powered by ATmega chip which must run at 20mhz.
- When all the LEDs are on, the circuit will consume about 10Amps (yes, there are lots of LEDs). We anticipate that about 1/8 (12.5%) of the LEDs will be on at one time, so we are estimating 1-2amps current draw.
- Ideally the circuit could run for a couple of hours on a charge.
- The battery should be relatively small. Lugging around a car battery on a bicycle is not an option.
The LEDs are SMD RGB LEDs, being driven from TLC5940. There are 120 LEDs, and 24 TLC5940s to drive them. There are a few other components, but other no major current sinks.
According to some posts here (which I am having trouble finding at the moment) LiPO batteries provide the best power density among the rechargeables. I worry that with LiPO batteries we'll have to use voltage regulators to get our 4.5-5.0V, since LiPO cells are 3.7V each. Does that mean losing power to heat? I suppose switching voltage regulator is an option, but I know very little about them.
What would be the recommended battery types for this purpose?