Offline Tool
Battery Runtime Calculator
How long will your battery run this radio or load? Quick field math with efficiency factor.
Estimate battery runtime from Ah capacity and load current. Field power planning for go-boxes and emcomm. Works offline after your first visit.
How long will your battery run this radio or load? Quick field math with efficiency factor.
Estimate load in amps, multiply by required hours, add a safety margin — LiFePO₄ allows deeper discharge than SLA.
Not all rated Ah is usable — SLA is often limited to ~50% depth of discharge; LiFePO₄ can use most of the pack safely.
KI4TQN is a ham radio, GMRS, and emergency communications hub from East Tennessee — free tools, local reference data, YouTube-aligned guides, and consulting for property owners. Use this map to find your lane.
Pick a path: FCC-licensed GMRS, ham exam study, FRS, Meshtastic, just licensed, emcomm volunteer, or property owner.
113 offline browser tools plus step-by-step deployment workflows. Install the site as a PWA for field use.
Tri-Cities, Erwin / Unicoi (I-26), NETNRC linked repeaters, nets, HF listening, go-bag sheets, and ARES/RACES context.
Blog, videos, downloads, antenna reference, and curated radio links — tied to the YouTube channel.
Paid emergency communications consulting for estates, ranches, and remote properties — plus contact and newsletter.