Rezervo Mini Batteryless Pocket Jump Starter with Ultracapacitor Technology RZ-300mini

SKU: RZ-300mini
$ 129.99
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Product Information

  • Designed for both the professionals and DIY users
  • Simple and safe to use
  • No batteries inside
  • No need to wait hours to recharge
  • Even starts vehicles without a battery
  • Ideal for cold starts on engines
  • 300A Starting current
  • Maintenance Free
  • For gasoline engines
  • Built-in Reverse Polarity and Short Circuit Protection
  • Built-in voltmeter
  • No degradation in performance with subfreezing temperatures or age
New Features for RZ-300mini:
-Less wait time to charge up the capacitors ~60 seconds
-LCD Display - shows battery voltage, percent charged, reverse polarity and override
-Alarm buzzer when fully charged or activating override function
-Compact and lightweight design with detachable cables
-LED light for locating battery terminals
-12V battery trickle when connected to a USB charging block 5V 2A output


Never get stuck again! With the Rezervo Batteryless Jump Starter, it will be ready anytime, anywhere you need it. Unlike traditional jump starters that require a charge before jumping your car, the Rezervo Batteryless Jump Starter only requires a quick charge from your weak battery to get your car started.


The REZERVO batteryless jump starter uses ultracapacitor technology. It is able to harness the power from your weak battery and boost it to start your car. With built-in intelligent circuitry designs, it also prevents you from making mistakes while using the jump starter.


This jump starter performs well in extreme conditions. Traditional batteries, such as lead acid or lithium-ion, deliver lower cranking current at low temperatures. The ultracapacitors in our batteryless jump starter keep the same starting current even at extreme cold weather

Charge off of the vehicle's own low voltage battery, another vehicle's battery, cigarette lighter adapter or mini USB via AC plug.


Charging the Jump Starter:

Recharge Time from car's battery: ~60 seconds

Recharge Time from 12V Socket: ~80 seconds

Recharge Time from USB: ~25 minutes

Customer Reviews

Based on 1 review
Terry S.
I'm a Believer

Got to use this more times than I would like while diagnosing a parasitic battery drain on one of my cars. Charges up quickly and simple to use. I was able to start the car in override mode even when the battery had dropped below 4V. I much prefer keeping these in my car emergency kits than jumper cables (big and heavy, need to find a willing good Samaritan) or a lithium battery pack (potential fire hazard and need to remember to keep charged). BTW, my battery drain was from a bad alternator diode.

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