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Keyline Battery Chargers, Maintainers, Battery Isolators, and Accessories


Automatic Protection

Multi-faceted safety features including reverse polarity protection, surge protection, over-voltage protection, short-circuit protection, spark-free connection, and IP65 dust and liquid resistant.

Weather Resistant

Holds IEC certification #IP65 - the ultimate in hazard-based electrical safety standards established by the IEC (International Electrotechnical Commission).

Ultra-Bright LED Indicator Lights

Includes 1 red and 2 green ultra-bright LED lights to indicate the status of your battery and which of the five charging modes your battery is in.

Advanced Diagnostics

Analysis phase identifies deeply discharged and dead batteries. This process takes only about 3 minutes.


With advanced micro-computing, adjusts to charging of multiple types of batteries. Compatible with all lead-acid and sealed batteries, (AGM, GEL, MF).

Smart Charging

Keyline Automatic Battery Chargers and accessories were designed rugged, portable and compact. Unlike other “smart” chargers on the market today, Keyline Chargers feature a unique 5-stage process. Just set it and forget it!  

A new charging cycle will automatically restart when the battery voltage falls below 12 V. If the charging cycle is interrupted, a new cycle will start.


One-of-a-kind desulphation stage improves charging speed and efficacy, extending the overall life of your battery significantly – up to 4X!


Made to do more than your average trickle charger. Designed with a exclusive 5-stage process. 1) Desulphation, 2) Bulk Charge, 3) Absorption, 4) Analysis, and 5) Float, all while simultaneously monitoring each stage.


5 Year Warranty

All the Keyline Mini-Pro Automatic Battery Chargers are inspected and tested prior to shipment. If you are not 100% satisfied with your purchase, take advantage of our 30-Day Money Back Guarantee.



Why Buy From Us?

Hello From the Owner

What our Amazon customers are saying about us...

"The Keyline Mini-Pro Automatic Car Battery Charger is elegantly simple in design and beautiful in its packaging. The single page of instructions and the minimal "warning" paragraph were more than adequate for the device. The charger itself is completely protected from electrical abuse and will not harm the car battery under any conditions..."

"Great product. We started using the charger right away and it is working great. It arrived on time, which is a plus during the holidays!
Everything as stated and then some. We had questions that were answered in a timely fashion before purchase. Would recommend this product and seller to everyone I know!"

"This is a very user-friendly unit. It has a cord on both sides of the transformer so that it does not take up 2 outlets. Well designed. I love the consumer-friendly consideration. Permanent battery connection for the generator battery was very simple to connect and the appropriate cords included. I purchased 2 units and am very glad I did. It comes with an outstanding 5 year warranty! That is standing by your product! The price is very reasonable. The cords are reasonably flexible. The face of the unit is also user friendly and easy to read. A+++++"

"I bought the KeyLine charger to charge up my battery packs to my home alarm as well as to the ATT box. Honestly I did not know they were rechargeable as I had already purchased replacements for them. When I was about to turn the old ones into be recycled is when I saw that they were all rechargeable thus I ordered the charger. It charged them right up so I am very happy with my investment."

Your Satisfaction is Our Main Concern

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