VoltRelic

Your power bank says 20,000 mAh. Your phone will never see 20,000 mAh. VoltRelic is an offline energy planner that works with what's left after conversion loss and real-world usage — so you know how many hours you actually have before the lights go out. BUILD YOUR VAULT Register the devices you carry with their battery capacity and consumption level. Add the power banks you own as Power Artifacts, each rated by class — standard, high-efficiency core, fast output, long life or compact travel — with its own efficiency multiplier applied to the number on the label. RUN AN ENERGY STRIKE One simulation returns six readings: total runtime, total consumption, usable energy pool, efficiency percentage, energy loss and an efficiency score — plus an optimization tip naming the one thing worth changing. PLAN FOR THE SITUATION YOU'RE ACTUALLY IN Four scenario modes bend the maths to match reality: • Travel Mode — standard conditions on the move • Night Survival — low consumption for extended runtime • Heavy Usage — several devices running hard at once • Balanced Use — ordinary days FIND THE BANK THAT FITS Answer three questions about outlet access, usage intensity and what you value most — runtime, speed or balance. VoltRelic scores 24 real power bank models on capacity, output and type, then ranks them by how closely they match your profile. No affiliate links, no sponsored placement, no store integrations — just arithmetic. LEARN WHY THE NUMBERS MOVE Nine plain-language articles covering Li-ion, Li-Po and NiMH batteries, what destroys efficiency in practice, and why runtime always lands under the figure printed on the box. KEEP YOUR HISTORY Your last 20 simulation runs are saved and fully re-openable, with average runtime and efficiency across all of them. COMPLETELY OFFLINE, COMPLETELY PRIVATE VoltRelic contains no network code at all. No account, no sign-up, no analytics, no advertising, no third-party SDKs, no tracking. It requests no system permissions whatsoever — not location, camera, photos or notifications, so you will never see a permission prompt. Everything you enter stays in local storage on your device, and Reset Vault erases all of it in a single confirmed tap. Every feature works in airplane mode, because there is nothing for the app to connect to. Free. No in-app purchases, no subscriptions, no advertising. Note: runtime and efficiency figures are estimates calculated from the values you enter, using typical conversion losses. Real results vary with temperature, cable and charger quality, battery age and how devices are used. VoltRelic is an independent planning tool and is not affiliated with, endorsed by or sponsored by any power bank manufacturer.