Unique Features
Everything you need to maximize your battery's lifespan and health. Click any feature to learn more.
Hysteresis Charge Cycles
Stops at your set limit, waits until battery drops 5%, then resumes. Prevents the constant trickle charging that degrades batteries.
Overtemperature Protection
Set your own temperature threshold (30-40°C recommended). Charging stops automatically when your device gets too hot.
Hardware Limiter (No App)
Protects any Li-ion battery without an app. Perfect for cameras, watches, drones, or phones that are turned off.
Overnight Scheduler
Keep your phone at 50-70% overnight, then top up to 90% just before your alarm. Best of both worlds.
10W Slow Charging Mode
Limits USB-C power to 10W for gentler charging. Slower = cooler battery = 4x longer lifespan.
CarPlay & Android Auto Passthrough
Maintains USB data connection while limiting charge. Use CarPlay or Android Auto navigation without constant 100% charging damage.
Multi-Location Auto-Connect
Place Chargies at home, office, and car. The app detects and connects automatically — seamless protection everywhere.
Works on All Platforms
Apps for iOS 13+, Android 6+, Windows 10+, and Linux. Works with iPhones, Samsung, Xiaomi, MacBooks, and any USB-C laptop.
Why stopping at 80% multiplies battery life
A lithium-ion cell ages fastest when it sits at high voltage. The charge limit keeps it out of that zone; hysteresis keeps it from creeping back in.
Voltage stress, not cycles, is the main killer
A phone at 100% holds its cells at about 4.20 V per cell. At that voltage the electrolyte oxidises and a resistive layer (the SEI) thickens on the graphite anode every hour the phone stays plugged in. Lowering the ceiling to roughly 4.00 V, which is what an 80% limit does, removes most of that stress. Battery University's long-running cycle tests put the effect at two to three times the cycle count.
What hysteresis adds
Software limits on some phones reach 80% and then trickle-charge to hold it there, which still keeps the cell at its ceiling voltage. Chargie cuts the current completely, lets the phone drain a few percent, then tops up again. The cell spends most of the night around 75–78% instead of pinned at the limit, and each top-up is a shallow partial cycle, the kind that barely counts against cycle life.
Depth of discharge matters too
Shallow cycles between roughly 25% and 85% deliver several times more total energy over the cell's life than deep 0–100% cycles. Chargie handles the top end; you handle the bottom by charging before the phone is empty.
Show data table
| Charge voltage per cell (approx. state of charge) | Cycles until 70% capacity |
|---|---|
| 4.20 V (100%) | 400 |
| 4.10 V (~90%) | 800 |
| 4.00 V (~80%) | 1200 |
| 3.92 V (~70%) | 1600 |
Source: Battery University BU-808, "How to Prolong Lithium-based Batteries" (cycle-life table, midpoints of the published ranges)
Show data table
| Years of use | Charged to 100% nightly | Limited to 80% with hysteresis |
|---|---|---|
| 0 | 100% | 100% |
| 1 | 86% | 95% |
| 2 | 74% | 90% |
| 3 | 64% | 86% |
| 4 | 56% | 82% |
Source: Chargie model derived from BU-808 cycle-life ranges; assumes 365 charges/year and linear fade to the 70% end-of-life point