PriorityStart! 12V ProMax Automatic Battery Protector
Item #: 12V-PROMAX   |    In Stock - Fast shipping from our US warehouse!

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PriorityStart! 12V ProMax Automatic Battery Protector

Item #: 12V-PROMAX   |  In Stock - Fast shipping from our US warehouse!

Today's Price: $124.95
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Price: $124.95


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Product Specifications for PriorityStart! 12V ProMax Automatic Battery Protector

Specifications:
BM Part #: 12V-PROMAX
Voltage: 12 Volt
Length: 5"
Width: 3"
Height: 1.25"
Shipping Weight: 3.00Lbs
Warranty: 1 Year Factory Direct
Product Manual: Download

What's in the box:

  • PriorityStart! 12V ProMax Battery Protector
  • Peace of mind your vehicle will start!
Features:
  • This item is covered by the Replacement Only Return Policy.
  • Automatic Voltage Monitoring – Disconnects loads when battery voltage drops below 11.7V to prevent dead batteries.
  • Automatic Reconnection – Reconnects power when brake pedal is pressed or accessories are activated.
  • Easy Installation – No hardwiring required; connects directly to top or side post batteries.
  • Durable Construction – Built with military-grade components; vibration and shock-resistant.
  • Universal Compatibility – Fits most 12V batteries; ideal for vehicles with high electronic demands.
  • Transferable – Easily move the unit between vehicles as needed.
  • Cost-Effective – Extends battery life and reduces maintenance costs by preventing deep discharges.
  • 20 Years Proven Technology - Protecting vehicle battery alternators, electrical system, your family and your wallet, used by thousands of law enforcement, utilities, and fleets, many using 2way/CB radios, radar, GPS, Dual batteries, chargers, TV, monitors etc.

Product Description

Free Standard Shipping!

Order today and get free standard shipping on your PriorityStart! 12V ProMax Automatic Battery Protector. This offer is valid for the contiguous 48 states.

PriorityStart! 12V ProMax Automatic Battery Protector – Never Get Stranded with a Dead Battery Again

Tired of unexpected dead batteries? The PriorityStart! 12V ProMax Automatic Battery Protector is your solution. This innovative system automatically prevents your vehicle's battery from draining completely, ensuring you always have enough power to start your engine. It's perfect for anyone who wants to avoid the hassle and downtime of a dead battery.


How It Works: Simple & Automatic Protection

The PriorityStart! ProMax monitors your 12-volt battery's voltage. If the voltage drops too low (below 11.7 volts), it automatically disconnects non-essential electronics. This keeps enough power reserved for starting your vehicle. When you're ready to go, simply engage the brake, turn on your headlights, or activate an accessory, and the system instantly reconnects—no buttons to push or hood to open.


Effortless Installation for Any Vehicle

You don't need to be an expert to install the PriorityStart! ProMax. It's designed for a straightforward, DIY installation without complex wiring. In just three simple steps, you'll be set:

  1. Connect your vehicle's existing positive cable to the PriorityStart! unit.
  2. Attach the PriorityStart! cable to your battery's positive post.
  3. Attach the ground wire to the battery's negative post.

Built Tough, Trusted by Professionals

This isn't just for personal vehicles. The PriorityStart! 12V ProMax is built with military-grade components, making it resistant to vibrations and shocks. It's a versatile solution that fits most 12-volt batteries and has a proven 20-year track record with:

  • Law enforcement agencies
  • Utility companies
  • Commercial fleet operators

It works seamlessly with high-demand electronics like two-way radios, GPS systems, radar detectors, and chargers, making it ideal for vehicles with extensive accessory loads.


Long-Term Battery Health & Savings

Beyond preventing inconvenient breakdowns, the PriorityStart! ProMax actively extends your battery's lifespan. By preventing deep discharges, it protects your alternator and safeguards your vehicle's entire electrical system from potential damage, saving you money on costly repairs and replacements.


Why Buy from Battery Mart?

When you choose Battery Mart for your PriorityStart! ProMax, you get:

  • ✅ We are an Authorized Seller of PriorityStart! products.
  • ✅ Enjoy Fast, Free Shipping and access to our expert support team.
  • ✅ Your purchase is backed by a 60-Day Return Policy and a 1-Year Warranty.

Protect your investment, save time, and avoid the frustration of a dead battery. Order your PriorityStart! 12V ProMax Automatic Battery Protector today!

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Cross Reference & Compatibility

The PriorityStart! 12V ProMax Automatic Battery Protector has been cross-referenced to be compatible with or replace these OEM part numbers and models:
PS-12
PS12
PSI-12-PRO
PSI-12-PROX-SP

Customer Reviews

88 Reviews | 4.7 out of 5
5 stars (71)
4 stars (13)
3 stars (1)
2 stars (1)
1 star (2)
95.5%
Would recommend this product.
What our Customers are saying
Tired of Having a Dead Battery on Seldom Used Box Truck at Non-Profit!
June 29, 2023
by on June 29, 2023

After repeated jump starting and premature battery replacement caused by a parasitic voltage drain, I finally installed the PriorityStart! 12V ProMax Automatic Low Voltage Disconnect Switch. It was easy to install and so far has worked great! The truck has started when needed even after several weeks of no usage.

SteveH
Lauren, SC
Would recommend to a friend?
Yes
Great. Unit... Life saver
July 23, 2022
by on July 23, 2022

Doing the job I expected. So far working well.

Fertnert
PA
Would recommend to a friend?
No
ProMax Protector Works
May 3, 2021
by on May 3, 2021

I have a parasitic battery drain some where in my electrical system that has yet to be located. I easily installed the ProMax Battery Protector and it works. No longer do I have a completely dead battery because the Protector temporarily disconnects the battery from the main electrical system until I trigger it to reconnect. My battery is protected whether I am able to find the parasitic drain or not.

Earle
North Carolina
Would recommend to a friend?
Yes
Stops Dead Batteries
December 22, 2020
by on December 22, 2020

This product is great and we use it on customer vehicles when they have a slow draw that drains their batteries. Highly recommend!

CA
Would recommend to a friend?
Yes
Love PriorityStart!!
June 28, 2020
by on June 28, 2020

Like the 1st one so much I just bought a 2nd for my 2001 toyota 4runner!!! The 1st one totally resolved my parasitic drain issue on my subaru which was a 6 amo drain!! Thanks guys!!

Tom
CO
Would recommend to a friend?
Yes
Great Great Great
June 25, 2020
by on June 25, 2020

Fixed my car and is easy to install

Shane
Tennessee
Would recommend to a friend?
Yes
Great Puduct
February 2, 2020
by on February 2, 2020

I love this But! this is a problem this the led connector, it need to be replaced with a nut and Bolt Connector,
on my truck the live cable came off the led connector and almost shorted on the body of the truck, vary dangers,
I went to canadain tire and bought a led post connector with nut and bolt,and it took care of the problem. In all Great Puduct.

None
Scarborough, On.
Would recommend to a friend?
Yes