Thread Tools Search this Thread Display Modes
Old 07-06-2009, 03:45 PM   #1
Join Date: Jun 2009
Posts: 4
Default Battery questions ('94 1700XR)

Just bought a '94 1700XR and love it!

It came with one battery but there are connectors under the other seat for a second battery.

The one that is in is a marine starting battery. Should I buy the same one? How does dual batteries works?
Does the outboard engine (Force 120HP) emit enough voltage to charge the batteries while running?


gabrielh is offline   Reply With Quote
Old 07-07-2009, 10:42 PM   #2
tglee's Avatar
Join Date: Feb 2007
Location: PA
Posts: 332
Default Re: Battery questions ('94 1700XR)

You should replace it with a starting battery. Or a "dual purpose" battery.

Starting batteries and deepcycle batteries are manufactured differently.

Both starting batteries and deep cycle batteries are lead-acid batteries that use exactly the same chemistry for their operation. The difference is in the way that the batteries optimize their design:

A starting battery is designed to provide a very large amount of current for a short period of time. This surge of current is needed to turn the engine over during starting. Once the engine starts, the alternator provides all the power that the engine needs, so a starting battery may go through its entire life without ever being drained more than 20 percent of its total capacity. Used in this way, a starting battery can last a number of years. To achieve a large amount of current, a starting battery uses many thin plates in order to increase its surface area.

A deep cycle battery is designed to provide a steady amount of current over a long period of time. A deep cycle battery can provide a surge when needed, but nothing like the surge a starting battery can. A deep cycle battery is also designed to be deeply discharged over and over again (something that would ruin a starting battery very quickly). To accomplish this, a deep cycle battery uses fewer thicker plates.

Does the outboard engine (Force 120HP) emit enough voltage to charge the batteries while running?
I'm not sure how many amps your force produces, but my 94 Mercury stator only makes 16 amps. In comparison a 3.0 Mecruiser alternator makes about 60. Our old outboards were made before small boats had GPS, depth sounders and high powered stereos. I don't know what your typical electrical draw is. I remove my battery after every outing and charge it at home.

One of the members with dual batteries will have to chime in with ideas on the best setup.
"Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote."

MMSI# 338052622
tglee is offline   Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
When should batteris be replaced? rgreenwell8962 Electronics 5 10-17-2009 11:24 PM
Need some opinions... cobra8432 Maxum Owners General Discussions 5 09-28-2009 12:41 AM
Deck Floor Lighting jman32 Electronics 2 06-08-2009 09:16 PM
Need help with AC/DC Fridge switch installation Mark Electronics 8 05-12-2009 12:17 AM
Owner's Manual plgzygote Maxum Owners General Discussions 4 03-01-2009 09:42 PM

Powered by vBadvanced CMPS v3.2.3

All times are GMT. The time now is 03:52 PM.

Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2021, vBulletin Solutions, Inc.