3Zebras: Tech News, Smart Home Guides and Digital How-To Tutorials
Smoke Detector Battery: 9V vs Lithium vs Sealed 10-Year Units, and Provincial Replacement Rules
Pick the right smoke detector battery: compare 9V, lithium and sealed 10-year alarms, see Ontario and NFPA replacement rules, and avoid the wrong-battery trap.
Projector 4K: Native Resolution vs Pixel-Shifting, and the Lumens You Actually Need
Shopping for a projector 4K? See how native panels differ from pixel-shifting DLP and 3LCD units, and match ISO 21118 lumens to your room before you buy.
Heated Jacket Buying Guide: Battery Voltage, Heat Zones, and Real Runtime by Setting
Compare heated jacket specs from Ororo, Milwaukee and DeWalt: 7.4V vs 12V watt-hours, heat zones, runtime per setting and the washing rules in the fine print.
AA Batteries: Alkaline vs Lithium mAh Ratings, Shelf Life, and High-Drain Performance
Compare AA batteries by chemistry: alkaline vs lithium mAh under high drain, 10 vs 25 year shelf life and cold limits, all from Energizer spec sheets.
Electric Bike Buying Guide: Motor Wattage, Battery Range, and Canada’s Class Rules
Buying an electric bike in Canada? Compare motor wattage, battery watt-hours and range claims, plus the Ontario and B.C. rules that decide what is road legal.
Deep Cycle Marine Batteries: AGM vs Lithium and Depth of Discharge
Compare AGM and lithium deep cycle marine batteries with real spec sheet numbers: depth of discharge, cycle life, weight, cranking power and charging voltage.
