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Blue Sea Systems 7649 Mini Add-A-Battery Kit, 65A

4.6 4.6 out of 5 stars 338 ratings
$108.65 with 15 percent savings
List Price: $128.40

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Battery Kit
65a Dc
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Purchase options and add-ons

Brand Blue Sea Systems
Size No Size
Battery Cell Composition Lead-Acid, AGM
Vehicle Service Type
Boat
Voltage
12 Volts

About this item

  • Don't get stranded - Add a Battery
  • Simplifies switching; Isolates engine and house circuits; Combines batteries for emergency starting
  • Tin-plated copper studs for maximum conductivity and corrosion resistance
  • Product Type - AUTO BATTERY

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From the manufacturer

Blue Sea Systems
battery chargers, battery switches, automatic charging relays, fuse blocks, busbars, meters

Blue Sea Systems was founded in 1992 based on a commitment to create innovative, high quality electrical products to improve the safety, simplicity, and reliability of boating. Since that time the range of product has expanded to over 1,000 items and distributed to customers in over 50 countries including Marine, Industrial, RV, and Specialty Vehicle markets. Products include battery chargers, battery switches, automatic charging relays, fuse blocks, busbars, meters, and both standard and custom power distribution panels. The company is committed to offering quality products that are engineered for the harsh marine environment, built to last, with a dedicated satisfaction and support team. Industry involvement ensures products meet ABYC, NMMA, and Coast Guard standards.

What Makes Blue Sea Systems Different:

360 Panel

Blue Sea Battery Switches

Push Button Circuit Breakers

Selection

Over 1,000 electrical products are designed to work together as a fully integrated system.

Industry Standards

Industry involvement ensures products meet ABYC, NMMA, and Coast Guard standards.

Quality

Blue Sea Systems is committed to product quality and is managed in a manner consistent with international business practices with a dedicated satisfaction and support team.

Looking for specific info?

What's in the box

  • Blue Sea Systems 7649-BSS Mini Add-A-Battery Kit - 65A

    • Product information

    Warranty & Support

    Product Warranty: For warranty information about this product, please click here

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    Blue Sea Systems 7649 Mini Add-A-Battery Kit, 65A

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    Product Description

    Adding a second battery to the electrical system prevents the unintended discharge of the engine start battery. Blue Sea Systems smaller, more compact version of the popular Add-A-Battery kit to its product offering was primarily designed for outboard powered boats with alternator output of 65A or less. When installed, the Mini Add-A-Battery isolates the start battery from the house loads which prevents the discharge of the start battery. The Mini Add-A-Battery offers a simple way to control the charging and battery switching of two battery banks. The M-Series Dual Circuit Plus Battery Switch simplifies the switching while the M-ACR automates charging between two batteries.

    Customer reviews

    4.6 out of 5 stars
    4.6 out of 5
    338 global ratings

    Customers say

    Customers like the ease of installation of the auto battery. They mention that the instructions are easy to follow and the product is made well. They appreciate the performance, saying that it works well and efficiently to keep the starting battery and house battery both separated. Customers also like that it allows them to recharge both batteries throughout their time on the water. However, some customers have reported that the product did not come with any hardware for mounting.

    AI-generated from the text of customer reviews

    25 customers mention21 positive4 negative

    Customers find the installation of the product to be easy. They say the instructions are easy to follow, and the installation process is straight forward. Some mention that the product is small in size and easy to mount. They also appreciate the fully automated system.

    "Easy to install, well made, the mini size is compact and has small footprint." Read more

    "...to the A and the A+B and both type of switches but this one is pretty much automatic you can switch it off to cut all power on and both I had to..." Read more

    "...Installation is simple enough if you're already familiar with marine electrical work...." Read more

    "...Never again. This thing is easy to install, gives multiple mounting options and works like it’s supposed to. Good product." Read more

    23 customers mention20 positive3 negative

    Customers like the quality of the product. They say it's easy to install, both parts are made very well, and the components are nice. Some say it is a great combo and well worth the money.

    "Easy to install, well made, the mini size is compact and has small footprint." Read more

    "Quality Items for a Great Price !!" Read more

    "...The good part is they are definitely heavy duty and very well made...." Read more

    "...Good product." Read more

    18 customers mention18 positive0 negative

    Customers are satisfied with the performance of the charging system. They mention that it works well, efficiently, and keeps the starting battery and house battery both separated.

    "This is a must have if you have multiple batteries. Works great and keeps the batteries charged while operating" Read more

    "...Has worked great on my pontoon with the new stereo system." Read more

    "...It works really well with my 55 amp alternator...." Read more

    "A must have for we who spend the night on the boat. This system is awesome because it not only charges all batteries and keeps them charged, it..." Read more

    11 customers mention11 positive0 negative

    Customers like the charging of the auto battery. They say it allows them to recharge both batteries throughout their time on the water, and it's convenient. They also appreciate the automatic charging switching for two batteries.

    "...Works great and keeps the batteries charged while operating" Read more

    "...enough to turn over the motor. Also included, there is the ACR to setup a dual charge and cut out when secondary battery is full...." Read more

    "...The other feature(s) is that the switch itself allows both batteries to be on but only draw energy from the battery that is physically being used..." Read more

    "Manages battery charging and discharging so that your starting battery cannot be depleted by other loads like downriggers, lights, GPS, radio etc...." Read more

    7 customers mention0 positive7 negative

    Customers are dissatisfied with the hardware of the product. They mention that it came with absolutely no hardware for mounting, and the directions are not clear. Some customers also mention that the screws to mount were missing.

    "Would have given it a 5 star review except there is no hardware for installation." Read more

    "Just opened the box, no hardware included. Looks like it’s a pretty specific size machine screw and nut." Read more

    "...The bad news is it came with absolutely no hardware for mounting and the directions aren't the clearest to understand...." Read more

    "...was a nut for the ACR rolling around in the package and it was missing the other nut. Clearly product had been sent back taped up and sold as new." Read more

    Battery Switch and ACR
    5 Stars
    Battery Switch and ACR
    Easy to install, well made, the mini size is compact and has small footprint.
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    Top reviews from the United States

    BR
    5.0 out of 5 stars Battery Switch and ACR
    Reviewed in the United States on September 25, 2023
    Pattern Name: Battery KitStyle: 65a DcVerified Purchase
    Easy to install, well made, the mini size is compact and has small footprint.
    Customer image
    BR
    5.0 out of 5 stars Battery Switch and ACR
    Reviewed in the United States on September 25, 2023
    Easy to install, well made, the mini size is compact and has small footprint.
    Images in this review
    Customer image Customer image
    Customer imageCustomer image
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    Michael Jenkins
    5.0 out of 5 stars Must have
    Reviewed in the United States on October 18, 2023
    Pattern Name: Battery KitStyle: 65a DcVerified Purchase
    This is a must have if you have multiple batteries. Works great and keeps the batteries charged while operating
    Helpful
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    Hans-Jurgen G.
    5.0 out of 5 stars Best Dual Battery Setup
    Reviewed in the United States on February 5, 2024
    Pattern Name: Battery KitStyle: 65a DcVerified Purchase
    If you are doing a dual battery setup - this has to be the best. especially when you have different amp hour batteries. My boat Seadoo Switch comes with a little jetski 18 AmpHour battery, I put in a large 110 Amp Hour battery as primary and made the 18 secondary. things can run independent.
    Position up is off, turn 1 quarter turn both batteries on independently and can run things separate. God forbid your primary is out, turn 1 more quarter turn and both on together. enough to turn over the motor. Also included, there is the ACR to setup a dual charge and cut out when secondary battery is full. I have not installed that yet. it is on my list of next things to upgrade.
    Helpful
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    Fla Jeep Guy
    5.0 out of 5 stars Quality Items for a Great Price !!
    Reviewed in the United States on March 28, 2024
    Pattern Name: Battery KitStyle: 65a DcVerified Purchase
    Quality Items for a Great Price !!
    Helpful
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    Mick
    4.0 out of 5 stars Great but no hardware
    Reviewed in the United States on October 29, 2023
    Pattern Name: Battery KitStyle: 65a DcVerified Purchase
    Would have given it a 5 star review except there is no hardware for installation.
    Helpful
     Report
    George Walker
    5.0 out of 5 stars Great Combo
    Reviewed in the United States on April 24, 2023
    Pattern Name: Battery KitStyle: 65a DcVerified Purchase
    This works as promised. Some folks say there is a fantom leak within the system. I asked Blue Sea about this concerns and they provided me with a wiring schematic to prevent any loss. Has worked great on my pontoon with the new stereo system.
    Helpful
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    Jd
    5.0 out of 5 stars Works great, easy to install worth the money instead of trying to retrofit an auto type.
    Reviewed in the United States on May 3, 2014
    Verified Purchase
    I was used to the A and the A+B and both type of switches but this one is pretty much automatic you can switch it off to cut all power on and both I had to call the company to make sure it was right but it has the house and aux battery automatically isolated if you hook it up correctly. it is small in size easy to mount and I like the ACR it did not work at first because I did not run the ground but after that it works great. I also called about how to hook up my float charger I was told that if you hook it up to either battery the ACR will determine which one to charge. I have it on a omc stern 2.3L with a 50 amp alternator.
    9 people found this helpful
    Helpful
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    ManfromMN
    5.0 out of 5 stars Allows multiple batteries to charge off alternator and combine them in a pinch - WELL WORTH IT!!!
    Reviewed in the United States on July 11, 2016
    Pattern Name: Battery KitStyle: 65a DcVerified Purchase
    This thing is AWESOME! I bought it for an I/O - I have a deep cycle and starting battery. This allows you to charge both batteries off of the alternator through the ACR. The other feature(s) is that the switch itself allows both batteries to be on but only draw energy from the battery that is physically being used (e.g. When my fish finder is on, the deep cycle battery is being utilized and NOT the starting batttery); the other feature related to the switch is that you can combine both batteries if you starting battery is low voltage. The ACR also stops power to the batteries if either falls below a certain voltage - this has essentially given me piece of mind and I don't have to worry about hauling a jump starter pack around.

    It works really well with my 55 amp alternator. I always charge my batteries up the night before and honestly, if I'm out for a couple of hours, it doesn't take long for both batteries to maintain full charge - you can see this through the LED status light on the ACR - I personally mounted this to my dash and l love having it right where I can see.

    Not only is it convenient to have both batteries recharge, but it really is a safety feature. This baby allows me to recharge both batteries throughout my time on the water!
    19 people found this helpful
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    Top reviews from other countries

    Translate all reviews to English
    Amazon Customer
    5.0 out of 5 stars Add a Battery on my boat
    Reviewed in Canada on July 23, 2021
    Pattern Name: Battery KitStyle: 65a DcVerified Purchase
    I use a trolling motor and some items in my boat will kill the battery over time - so this product I bought so that I don’t have to worry about getting everyone ready for a boat ride just to find the battery is dead :-(
    And
    To be able to turn off any connection between the accessories and the batteries is a good thing :-)
    If you purchase some large wire and end connectors and follow the directions on the drawings sent it is very easy to wire up - whether you want to wire it up through your dash console or all at the back of the bought as I did.
    You turn it two twining the batteries when you start and are cruising so that you get a great start every time and you get both batteries charges and turn it to main battery #1 only when you want to use your trolling battery and you never have to worry that you kill both batteries to be able to strat up your motor again to head home. I am very pleased with the product and would highly recommend it.
    Good luck !!!
    Brad
    Report
    PETRO
    5.0 out of 5 stars A must have
    Reviewed in the United Kingdom on March 6, 2019
    Pattern Name: Battery KitStyle: 65a DcVerified Purchase
    As expected from blue sea systems, a very nice item. A must have on a boat. No more worries for switching from one battery to another. A peace of mind....
    Report
    Sandmann
    5.0 out of 5 stars Great way to add a second battery
    Reviewed in Australia on October 3, 2023
    Pattern Name: Battery KitStyle: 65a DcVerified Purchase
    I used this to add a second battery to my 23 year old boat... it was pretty straight forward, but if you're confused there's plenty of videos about it on youtube. You'll need some fuses to go between the battery switch and the voltage sensitive relay... they recommend "battery post fuse blocks", "Blue Seas Systems" make them, but you can get cheaper clones on here.
    Report
    J’ai reçu le C.D.I. mais le case était craqué
    5.0 out of 5 stars Parfait pour bateau
    Reviewed in Canada on July 3, 2023
    Pattern Name: Battery KitStyle: 65a DcVerified Purchase
    Bonne utilisation mais il vous faut un minimum de connaissance
    Report
    gecha
    5.0 out of 5 stars Kit de batterie facile a installer
    Reviewed in Canada on September 9, 2021
    Pattern Name: Battery KitStyle: 65a DcVerified Purchase
    Ce kit permet d'installer 2 batteries sur le bateau et chaque batterie peut être reliée pour un usage spécifique. Facile à installer, mais il faut bien lire les instructions lors de l'installation des cables.
    Report