Building a 12V 110Ah battery bank using 80 32650 LiFePO4 cells

Kerry Wong built a DIY battery bank using eighty 32650 LiFePO4 cells: During the past couple of weeks I have been busy making a large battery bank using the eighty 32650 LiFePO4 cells I bought on eBay. The battery bank I am building is a 12V (13.2V nominal) 4S/20P one. With each cell rated at […]

A low-voltage disconnect for 12 volt lead acid and lithium batteries

KA7OEI writes: The avoidance of overcharging is usually pretty easy to avoid: Just use the appropriate charging system – but overdischarge is a bit more difficult, particularly if the battery packs in question don’t have a “protection board” with them. Lead acid batteries (almost) never come with any sort of over-discharge protection – one must […]

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 […]