How do I know when I need a new battery?

Signs of a failing battery include: battery drains much faster than it used to, device shuts off at 20–30% battery remaining, battery percentage jumps erratically, device won't hold a charge at all, or a swollen battery bulging under the back cover.

Battery Replacement — Laptop, MacBook, iPhone & Android

Same-day battery replacement in Rancho Cucamonga for iPhones, Android phones, laptops, and MacBooks. Supreme Tech uses high-quality replacement batteries matched to your device model — restoring full battery life and eliminating shutdowns, rapid drain, and charging problems. 90-day warranty on every battery replacement.

Batteries degrade over time and typically need replacement after 2–4 years of use. A new battery is almost always far cheaper than a new device, and a fresh battery can make an older phone or laptop feel like new again. Walk-in battery replacement is available at our Rancho Cucamonga shop — no appointment required for most devices.

Battery Replacement Services

iPhone battery replacement — all iPhone models, iPhone 8 through iPhone 15 Pro Max. Done in 30–45 minutes.
Samsung Galaxy battery replacement — Galaxy S, Galaxy A, and Note series phones.
Android phone battery replacement — Google Pixel, Motorola, OnePlus, LG, and other Android brands.
Laptop battery replacement — Dell, HP, Lenovo, Asus, Acer, and all other laptop brands. Same-day service.
MacBook battery replacement — MacBook Air and MacBook Pro, all models including M1, M2, M3.
iPad battery replacement — all iPad models.
Samsung Galaxy Tab and other tablet battery replacement.
Swollen battery replacement — immediate service for bulging batteries (safety issue, do not delay).

Signs You Need a Battery Replacement

Battery drains much faster than it used to — half-day battery life from a full charge
Device shuts off at 20–30% battery, or shuts off unexpectedly
Battery percentage jumps erratically — from 30% to 5% instantly
Device won't turn on without being plugged in
Battery bulging — swelling visible under the back cover (safety hazard, replace immediately)
iPhone showing 'Service Recommended' battery health warning
MacBook showing 'Replace Now' or 'Service Battery' in the battery status menu

Frequently Asked Questions

How long does battery replacement take? iPhone: 30–45 minutes. Laptop: 1–2 hours. MacBook: 1–2 hours. Most are same-day.

How do I know I need a new battery? Fast drain, random shutoffs, swelling, or battery health below 80% (iPhone) or 'Service Battery' warning (MacBook).

Do you replace iPhone batteries? Yes — all iPhone models, 30–45 minutes, same-day.

Do you replace MacBook batteries? Yes — all MacBook Air and MacBook Pro models. Swollen batteries replaced immediately.

Service Area

Battery replacement for customers in Rancho Cucamonga, Ontario, Fontana, Upland, and throughout the Inland Empire.

Book Battery Replacement Call (840) 999-1034

📍 11830 Sebastian Way Ste 103, Rancho Cucamonga, CA 91730 · 📞 (840) 999-1034 · Mon–Sun 10 AM–6 PM