Your phone stops charging at 100%. It never stops sitting there.
Held at 100% and warm for six hours a night is what quietly wears your battery down. ChargeGuard physically cuts the power the moment you're full - the one thing your phone's software and a wall brick can't do.
Works inline with your phone, laptop, and earbuds - one USB-C adapter for every device you charge.
Your phone doesn't overcharge. It just never lets go of 100%.
Modern phones already stop the flow of charge at full - that part is true. What they can't do is disconnect the battery from the wall. So the cell sits pinned at max voltage and warm all night. That high-charge heat is exactly what accelerates lithium degradation.
The 20-80% rule, in one line
Battery makers, TechRadar, and the wider consensus agree: lithium cells last longest kept between roughly 20% and 80%. Living at the top of the range - full and warm - is where the fastest wear happens. Knowing the rule is easy. Following it every night is the part nobody manages.
Software delays. Hardware disconnects.
This is the difference the fatal objection misses. Your phone can manage the flow, but it can't unplug itself. ChargeGuard sits inline and physically cuts the power - the one thing no amount of software optimization can do for you.
The fix isn't charging slower. It's not being held at 100% for six hours a night.
Set it once. It handles the unplugging you never would.
Plug it in, inline
Slot ChargeGuard between your cable and your device (or the wall brick and the cable). It stays there for good - no app, no setup, no daily fiddling.
Charge at full speed
It passes power through at up to 140W - your fast charging stays exactly as fast, and the LED shows the live wattage so you can see it working.
At 100%, it cuts the power
The moment you hit full, ChargeGuard physically disconnects the line. The readout goes dark. No trickle top-off, no extra heat sitting on the nightstand all night.
Full 140W fast charging the whole way up - it only steps in once you're done.
The principle behind it isn't ours - it's the industry consensus.
Battery manufacturers, tech editors, and lithium-cell research all point to the same thing: holding a cell at a high state of charge, warm, accelerates its aging - and keeping it roughly in the 20-80% band is the recommended way to preserve capacity. ChargeGuard simply automates that principle at the plug.
Over-current protection
Built to manage the load safely so it safeguards your device rather than risking it - even at full 140W throughput.
Over-heat protection
By cutting power at full, the biggest source of overnight heat is removed - the device isn't left cooking on the nightstand.
Your phone can't. You won't. So it does.
Watch the moment it cuts the power
The readout hits 100%, then goes dark - off the nightstand, no extra heat.
The LED hit 100 and just cut off. My phone's never sitting warm all night now.
Devon R.
I could never stick to the 20-80 rule. This does the unplugging for me.
Laura M.
Peace of mind, one plug at a time.
Plug it in and forget it. That's the whole appeal.
I've kept phones for years and always watched the battery slowly die. This is the first thing I've found that actually addresses the overnight held-at-100 problem instead of just claiming it. The LED cutting off is oddly satisfying to watch the first night.
My nightstand phone isn't warm in the morning anymore. Small thing, big difference.
Bought it half-skeptical because my phone 'already stops at 100'. Then I read how it just holds it there. This actually disconnects. Wish I'd had it two phones ago.
Fast charging is still full speed. It only kicks in at the end. Exactly what I wanted.
Use it on my phone and my earbuds case. One adapter, no app, no thinking about it. Been rock solid.
Plug it in once. Protect a device worth hundreds - for years.
Battery care finally becomes automatic. Try ChargeGuard for 30 days - if it's not for you, get every cent back.
Protect My Battery Tonight30-day money-back guarantee · Free worldwide shipping · 1 year warranty