Blue Sea Systems #7649 Mini Add-A-Battery

Blue Sea 7649 Mini Add-A-Battery System

On sale ~~$125.33~~ $95.96

Mini "Add A Battery" package comprises a double pole battery switch to simplify switching and an automatic battery combiner to simplify charging.

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p/n: BSS-7649003

Availability: 4 in stock

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P65 Warning
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Additional information
Questions & Answers

Adding a second battery prevents getting stranded with a dead battery by isolating the start battery from the house loads that can quickly discharge a battery. The Mini Add-A-Battery offers a compact, simple way to control the switching with the m-Series Dual Circuit Plus™ Battery Switch and automatically share a single source of charging between two batteries with the Mini ACR Automatic Charging Relay.

Suitable for use with most outboards, this is a smaller version of the 7650 Add-A-Battery system sold for larger boats.

Kit includes Battery Switch Model # 6011
Kit includes Automatic Charge Relay Model # 7601
Continuous Rating 65 Amps
Intermittent Rating 115 Amps for 5 minutes
For 12 or 24 Volt Systems
Maximum Cable Size 1/0
1/4" Threaded Studs on ACR, 3/8" Threaded Studs on Battery Switch
Instruction Sheet and dimensioned drawings
At PKYS we sell the boxed version of this which is more suited to eCommerce, the variation part number is 7649003

Q: Looking at the 7649 mini add a battery. Your product says it will work with most outboards. I have a 2010 merc 4 stroke 90hp, is it compatible? I will have boat lights, fish finder, fuel gauge, radio, stereo and a high lumens LED flood light and 2 Scotty 30amp down riggers running off my house battery. There will be a 12-16' run between your product and the house battery. What gauge wire should I run?

Asked by: Dave - 8/26/2015

A: The 7649 Mini-Add-A-Battery has a continuous rating of 65 amps and as far as I can tell your engine has a 50 amp alternator. You might want to check that in the owner’s manual though. As long as the alternator output is 65 amps or less this is the right product.
Your question about wiring depends on exactly how this is setup but to use the full 65 amps of capability you need to have at least 8 awg wire. I am assuming the start battery is near the engine. Note that the two battery banks must share the same negative also so the negative must also be at least 8 awg. In order to use the house battery to assist starting if the start battery went flat the wire would have to be quite a bit bigger because of voltage drop, I would suggest 4 awg

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Answer provided by: Peter Kennedy (8/26/2015)

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Q: Want to add 2nd battery system on 14 ft. aluminum boat with 15hp Evinrude motor. has no alternator, but has electric starter. need 2nd battery for lights & other accessories. fish finder, trolling motor. May purchase newer motor later.

Asked by: Don Cooper - 1/19/2020

If your engine doesn't provide any charging then you presumably must have some other way to charge the battery, either solar or a shore charger, so you can still use the same add a battery kit.

You might like to look at the Blue Sea 7605 BatteryLink Charger which is a battery charger with the ACR built in, If you got that then all you would need to add would be the 6011 Battery Switch

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Answer provided by: Peter Kennedy (1/20/2020)

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Blue Sea 7650 Add-A-Battery System with ACR and Battery Switch

~~$177.74~~ $129.95 Sale

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Blue Sea 7649 Mini Add-A-Battery System

Q: Want to add 2nd battery system on 14 ft. aluminum boat with 15hp Evinrude motor. has no alternator, but has electric starter. need 2nd battery for lights & other accessories. fish finder, trolling motor. May purchase newer motor later.

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