I like the KISS method.  Use a multimeter to check the battery when fully 
charged.  It should be about 12.5 volts.  Check it when the engine is running 
and it should be 13.5 volts or higher.  If the battery cannot be recharged to 
12.5 volts, it is probably bad.  That is when you pull it out and take it to a 
battery store.  This has worked for me for more years than most of you guys 
have been alive,.
Frank 

    On Monday, October 3, 2016 1:21 PM, David Knecht via CnC-List 
<[email protected]> wrote:
 

 I would like to be able to monitor the health of my batteries without having 
to haul them off the boat.  I looked at Amazon and found many battery testers 
(load and conductance) from $15 to $250.  Has anyone tried any of these devices 
and have any suggestions on what to buy or not to buy? Dave  
Aries
1990 C&C 34+
New London, CT



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