Intelligent charge control
STOP KILLING YOUR BATTERY.
VoltGuard is the smart USB-C adapter that cuts power the instant your battery hits 100%, protecting health, saving energy, and extending lifespan by up to 3x.
Free shipping over $50
30-day returns
18-month warranty
3×
Longer battery life
<3s
Cut-off time
65W
Max supported
The problem
YOUR CHARGER IS HURTING YOUR BATTERY
Most chargers keep feeding power to your device long after it reaches 100%. This keeps your battery at high voltage stress for hours every night — silently degrading its capacity.
After 12 months of overnight charging without protection, most batteries drop to 80% of their original capacity. VoltGuard stops that from happening.
Get VoltGuardBattery health comparison
Without VoltGuard
79%
After 12 months of overnight charging
With VoltGuard
97%
Battery stays like-new for years
What VoltGuard does
FOUR WAYS IT PROTECTS YOU
01
FULL CHARGE STOP
Cuts power the instant your device hits 100%. No trickle overcharging, no battery stress, ever.
02
OVERCHARGE GUARD
Built-in circuit detects voltage spikes and blocks excess current before it can reach your battery.
03
AUTO POWER-OFF
Smart relay disconnects within 3 seconds of reaching full charge. No app, no settings, no fuss.
04
TYPE-C UNIVERSAL
Works with any USB-C device — iPhones, Androids, iPads, MacBooks, tablets, earbuds. Up to 65W.
How it works
FOUR STEPS. ZERO EFFORT.
01
PLUG IN CHARGER
Connect your existing USB-C charger to the VoltGuard adapter's input port.
02
CONNECT DEVICE
Plug your phone, tablet, or laptop into the output end. LED turns green.
03
CHARGE DETECTED
The internal sensor detects 100% and cuts the circuit within 3 seconds. LED turns white.
04
SLEEP EASY
No overcharging overnight. Battery health preserved, energy saved.
Customer reviews
WHAT PEOPLE ARE SAYING
4.8
★★★★★
Based on 94 reviews
★★★★★
"Left my phone on charge overnight for years. After 6 months with VoltGuard my battery health is holding at 98%. My old phone was at 79% by this point. Genuinely wish I had found this sooner."
★★★★★
"Works exactly as described. Plug it in, forget about it. The LED turns white when it stops and it's so satisfying. Got the twin pack for me and my partner. We both use it every night."
★★★★☆
"Solid build quality, tiny enough to throw in a bag, does exactly what it says on the tin. Bought the family 3-pack for the whole house. Great value when you think about what a new battery costs."
★★★★★
"I was sceptical at first — seemed too simple. But checked my battery health after 3 months and it's sitting at 100%. Before VoltGuard it always dropped to 95% within the first few months."
★★★★★
"Perfect for travel. I plug it in at the hotel, go to sleep, and I know my phone won't be sitting at 100% all night. Tiny, no app needed, just works. Worth every penny."
★★★★★
"Bought this for my kids' iPads after having to replace one battery at £80. This is £35 and protects it permanently. Should have bought it the day we got the iPads. Customer service was great too."
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PICK YOUR BUNDLE
Free shipping on all U.S. orders over $50. All bundles include an 18-month warranty and 30-day money-back guarantee.
1× unit
STARTER
$34.99
Save $15 vs retail
$34.99 per unit
- 1× Full Charge Separator
- LED charge indicator
- 18-month warranty
- Free shipping over $50
Most popular
2× units
TWIN PACK
$54.99
Save $40 — $27.50 per unit
- 2× Full Charge Separators
- LED charge indicator on each
- 18-month warranty
- Free shipping included
3× units
FAMILY PACK
$69.99
Save $65 — $23.33 per unit
- 3× Full Charge Separators
- LED charge indicator on each
- 18-month warranty
- Free shipping included