Via Nerd Ralph.
I like LiFePO4 batteries. They have a rather flat discharge at around 3.2V, which is ideal for powering 3.3V devices without a regulator. You can also use them in devices that take 2 standard AA cells by using a blank shunt in the 2nd battery slot since 2 fresh alkaline cells in series provide 3.2-3.3V. And since they are readily available in the 14x50mm AA size, you can use cheap AA holders for them in electronics projects.
When it comes to chargers, things can be a bit problematic. LiFePO4 batteries should be charged to 3.6V, rather than 4.2V like regular lithium-ion batteries. A good charger costs $10-$15, but charging at a high current will reduce the number of recharge cycles. The Soshine batteries I bought indicate on the label a standard charging current of 300mA to 3.6V. Rather than search for a charger to fit the bill, I decided to make one.
Have an amazing project to share? Join the SHOW-AND-TELL every Wednesday night at 7:30pm ET on Google+ Hangouts.
Join us every Wednesday night at 8pm ET for Ask an Engineer!
Learn resistor values with Mho’s Resistance or get the best electronics calculator for engineers “Circuit Playground” – Adafruit’s Apps!
Maker Business — Undercover in an iPhone Factory (video)
Wearables — Go with silicone
Electronics — Shift away from basic arithmetic
Biohacking — Bunnies Book “The Hardware Hacker” Applies to Biohackers
No comments yet.
Sorry, the comment form is closed at this time.