1 battery or 2

[spanishmak]

The other day I forgot that I took one battery out of my boat,I went to start my boat and it just would not start,when I finally realized that I only had 1 battery in there.As soon as I put the other battery in the motor started right up.My question,shouldnt the motor start with just one battery?One battery is an everstart maxx 675 cold cranking amps and the other one is an everstart trolling deep cycle rv battery 720 cold cranking amps(tried to upload pics but could not do it!)The battery that was in there by it's self when it wouldnt start was the 720 cold cranking amps and it was charged.Are these batteries strong enough for my motor(1979 Johnson 200 h.p.),or do I need something stronger since 1 alone did not start it?And would this also make the primer solenoid not prime right;I would really appreciate any help you guys can give me!!THANKS

 

[James R]

Re: 1 battery or 2

One battery is sufficient. Your battery hook up is at fault. Probably just dirty terminals.

 

[Bifflefan]

Re: 1 battery or 2

Take the 720 and have it tested. I bet you find its going south on you.
Also for cranking, you need a cranking batt. For trolling you need a deep cycle.
Read up on batteries, each type have a specific purpose and dont like to be used for anything else.

 

[Solittle]

Re: 1 battery or 2

The other day I forgot that I took one battery out of my boat,I went to start my boat and it just would not start,when I finally realized that I only had 1 battery in there.As soon as I put the other battery in the motor started right up.My question,shouldnt the motor start with just one battery?One battery is an everstart maxx 675 cold cranking amps and the other one is an everstart trolling deep cycle rv battery 720 cold cranking amps(tried to upload pics but could not do it!)The battery that was in there by it's self when it wouldnt start was the 720 cold cranking amps and it was charged.Are these batteries strong enough for my motor(1979 Johnson 200 h.p.),or do I need something stronger since 1 alone did not start it?And would this also make the primer solenoid not prime right;I would really appreciate any help you guys can give me!!THANKS

Like James your problem is most likely not with either battery but with corrosion with the battery cables. Having said that I would not venture out in a boat that relies on a battery for starting with out two FULLY charged batteries. That is unless you have a small boat that can be started with the recoil starter or you can get back to the dock with oars.