Ampere

Battery charging speed monitor that reveals which chargers and USB cables actually work best on your device. Ampere measures your phone's real-time charging and discharging current, letting you compare different charger and cable combinations side by side.

Understand your device's power behaviour. The app displays the milliamp (mA) current flowing into or out of your battery. When unplugged, you see negative values showing how much power your phone consumes while idle or in use. Connect a charger, and the display shows what's actually reaching your battery after powering active processes. If your phone draws 300mA on its own and you plug in a 500mA charger, only 200mA charges the battery—Ampere makes this invisible trade-off visible.

Multiple factors shape charging speed, and Ampere helps you isolate which matter most on your device. Your results depend on the charger type (USB, AC, or wireless), cable quality, phone model, running tasks, display brightness, and network states like WiFi and GPS. Start the app, wait about 10 seconds for calibration, and watch real charging performance emerge. The readings aren't lab-grade precision, but they're accurate enough to prove whether that old cable charges slower than your new one—on the same phone, in the same conditions.

Unlock advanced monitoring with Pro features. Add home screen widgets to track charging at a glance, get notifications when specific current thresholds are reached, receive alerts directly on your device or Android Wear smartwatch, and customize measurement sensitivity through the settings menu. If your device reports zero current, try the legacy measurement method to access older hardware interfaces.

A practical note on battery chemistry: LiPo batteries don't draw maximum current throughout the charging cycle. As your battery fills, charging current naturally decreases—this is normal and healthy. Early in the charge cycle, you'll see higher currents; near full capacity, currents drop significantly. This behaviour differs from what many expect, but it's how modern phone batteries protect themselves.

Device compatibility varies. Most modern Android phones work seamlessly, but some devices lack the hardware measurement chip or firmware support required. Certain Samsung models report only theoretical maximum current rather than actual values due to firmware limitations. A complete compatibility list and detailed FAQ are available to help confirm your device works properly before you begin troubleshooting.

Ampere transforms abstract charging complaints into measurable proof, helping you invest in better cables and chargers with confidence.