battery alarm

HSMM-MESH - A high speed, self discovering, self configuring, fault tolerant, wireless computer network that can run for days from a fully charged car battery with focus on emergency communications

Battery Bank - Specialize in batteries and batteries charges

Solar panels test - Solar panels test for portable battery charger by YO4HHP

Home Brew 9 Volt Battery Clip - Make your own battery clip by nj2x

Adjustable Regulated Battery Charger - This battery charger circuit is regulated and adjustable to make this circuit able to charge the mosto NiCAD battery.

A NiCAD Battery Charger - A NiCAD Battery Charger with Current and Voltage Limiting

ZL2PD CMOS Keyer - Two cheap CMOS ICs and a few transistors was all that was required to rebuild an elderly TTL automatic morse keyer into a low current lightweight battery powered iambic morse keyer.

Find RFI causes in mobile operations - Troubleshooting your power supply, in determinig connections to battery, alternator and regulator interference and checking power supply leads.