Look for any post by 'Paul_G' - a link in his signature takes you to his website which has instructions on wiring up two batteries to both be charged by the outboard.

But a good condition single 105ah battery should be more than enough to cope with your needs, so you could just keep a fully charged spare battery on board in case - it would of course mean swapping it over rather than just being able to flick a switch, but for 'just in case' use, unless your battery is really inaccessible it shouldn't be a problem.

Does the engine have a pull start facility? - In which case you would have a double back up.

 

Thankyou for your advice! It has no pull cord so think i will go with your suggestion. Sounds much easier. The alternator should keep it toped up and will always keep a spare. My battery is right under my feet where i sit when driving so easy to get to.

 

When you are fishing, you won't have much battery drain. You will have one little masthead light and possibly a 5W cabin light. The VHF on standby won't use much. That's about 1 amp/hour total so your battery would keep that going all day and all night.

 

Thankyou all for your help i have now got full set up sorted. Works a treat! Thanks again!