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Second Full or Auxiliary Battery

Rick S said:
Does anyone have a picture of where they placed their added battery and the perko switch? I plan to add a second battery this coming weekend and for got to take pictures of the compartment so I could plan out what I will need for mounting. I have a 2010 2554-GCW with Yamaha 150 and the first battery is under the rear lounger - I'm hoping there is room to install another battery box right next to the first one and find a place close by for the switch. Anyone have pics that you think might be helpful. Rick
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Dual bat..jpg
Had the dealer add the second battery and switch for peace of mind. This is at the rear starboard lounger on a 2018 22 SSRFBXP.
 
Buying used 2275RL. Has one battery, want to add one = 1 cranking and 1 for house. Do you recommend A Blue Sea Add-A Battery set up? Rookie here. Previous owner's son attempted to charge the 1 battery and burned up the wiring harness ( which has been replaced by qualified marine service specialist). Before the season want to add a second battery. Any recommendations. Current battery located underneath stern sun pad, behind stern benchseat. Can 2nd battery be added. Any suggestions on battery too?
 
I have the Blue Sea charging relay and it's awesome. It's completely hands off, and I always have a fresh starting battery. Same relay as in that kit, but without the orange switch. I found the switch unnecessary, and required a hole be cut into the boat somewhere, or at least a bunch of screws.
 
I put both of my batteries on a charger after being stored for the winter. The first started at 75% charged and took the charge up to 100%. The second started at 0% and would only charge up to 66% (according to the charger). When I put the switch on #1, accessory switch and other items indicate the battery is working. Same with 1+2. But with the switch on #2, I get no signs of battery life. Boat is 3 years old. Am I going to need new batteries? Thanks.
 
Take it to an auto parts store and have them load test it to be sure, but sounds like you need a new one. You might trickle charge them over the winter, depending how long your winter is. Or put them on the charger you already have a couple times during the winter. That should help prevent this.
 
Also, i wouldn't run them in parallel, or 1+2 until you get this fixed. The bad one could drain the good one and leave you stranded.
 
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