How to design and build your own Lithium battery pack

Adam Bender posted detailed instructions of how to design and build a custom DIY lithium battery pack with 18650 cells: Designing a custom lithium battery pack is a fun way to learn about electricity and engineering. Lithium batteries can be used for countless applications including electric bikes, scooters, vehicles, backup power suppliers, off the grid […]

Lithium iron phosphate (LIFePO4) battery charger

After two DIY Li Ion chargers this week (first, second), here is a lithium iron phosphate (LIFePO4) battery charger. These batteries are a safer cousin to the standard Li-Ion batteries, but sacrifice some of it’s energy density for the safety. The charger above is designed around the PIC12F510 microcontroller which implements a rudimentary USB powered […]

£1 Lithium Ion battery charger

Here’s another custom Li Ion battery charger and holder. Yesterday we ran a post involving a custom battery holder for cell phone batteries, today it’s a holder for a more conventional 18650 type Li Ion batteries. To make a battery charger, just solder the red and black leads to the BATT+/- terminals on the charger […]

Open source DIY friendly Li Ion battery charger

Miceuz designed 2 open source single sided boards for Li Ion battery chargers. He used the MAX1555 and MCP73831 ICs as the charging controller, power is provided through USB. We especially like his battery holder rig. For a long time I wanted to enter the 21st century by stopping using NiCad or NiMH batteries and […]

Lithium Polymer internal resistance meter determines battery life

Here’s a project that let’s you measure the internal resistance of Lithium Polymer batteries. It measures the total current as the battery discharges through a 1 Ohm resistor. From the known voltage and the discharge current the internal resistance can calculated. This device can be used to measure the internal resistance of Lithium Polymer batteries […]

Simple USB DIY Li-ion battery charger circuit

arup shared his USB DIY Li-ion battery charger circuit in the project log forum. The circuit uses both op-amps of an LM358 to control the charging of a single cell lithium ion battery. Charging automatically stops when the battery is full, and it is possible to charge batteries that have gone below the undervoltage limit. Power […]