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With the right charger that has an adjustable charge rate, you should be able to charge them in 1 hour at 1C. C is a measure of charge rate, depending on the capacity. A 3000mah battery would need 3 amps to charge at 1C. I use an RC charger from hobby king: https://hobbyking.com/en_us/turnigy-accucel-6-80w-...Old or over discharged batteries may need to be charge at as low as 0.1C to recover them
I saw an instructable that used that arrangement with a 555 timer to make a simple synthesizer, each button would play a different pitch.
Lunch Box Computer with Raspberry Pi
Raspberry Pi Portable Games Console
Raspberry media player casing
GoPro Real Time FPV Transmitter
So you dropped your no.4 hand plane?
yes, but only use a small speaker
Trolley jacks generally have a fat, short cylinder that could be removed from the jack to get a higher strength press but they may be tricky to mount
Some laptops have a high capacity battery as an option, the standard batteries probaly use the plastic tubes
there will be no problem
DIY functional Sonic Screwdriver
The pocket grill
DIY aluminum investment casting using a 3d printer.
Colorful Laptop Backlighting for $5
Homemade Carbon Fiber Mountain Bike
Build your own 3d printer filament factory (Filament Extruder)
The Stirling Engine, absorb energy from candles, coffee, and more!
40W Bluetooth Portable Speaker (Improved Version!)
DIY CNC Router
Rideable Trash Can 2.0
Weed Eater Powered Scooter
OSD Audio ATM-7 Smartphone Speaker Control with Arduino and Blynk
From spoon to broadhead
Protopiper: physically sketching room-sized objects at actual scale
Building a Gypsy Wagon
Wearable FM Transmitter(250 m range,easy setup)
Convert Your Old Laptop Battery Into a Power Bank
The MicroCamper a.k.a "Fat Berta"
Steampunk themed propeller ceiling fan.
Make Your Own Miniature Electric Hub Motor
2 String Paddle Bass
DIY Supercharged Bluetooth Speaker (v2.0)
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