Gerry underwood Posted December 19, 2019 Report Share Posted December 19, 2019 At the moment we have 3 leisure batteries hooked up. The boat came with 2 spare batteries. Would it be beneficial to get them hooked up as well? Link to comment Share on other sites More sharing options...
Detling Posted December 19, 2019 Report Share Posted December 19, 2019 you will probably find the 'spare batteries' are in fact dead and the previous owner couldn't be bothered to weigh them in at a scrappy. Measure the voltage if under 12.4 they are unlikely to be very useful. If you are on a shore line then charge them up with a mains charger for 8 hours and then load them with a old style car headlight bulb (60watt), they should light that for over 10 hours to be of much use (50Ahrs ). If they are 'dead' then connecting them to your present batteries may damage the ones in use, and if they have a 'dead cell' they may actually explode/split their case. Link to comment Share on other sites More sharing options...
Gerry underwood Posted December 20, 2019 Author Report Share Posted December 20, 2019 Excellent advise. Thank you. Link to comment Share on other sites More sharing options...
blackrose Posted December 20, 2019 Report Share Posted December 20, 2019 22 hours ago, Detling said: Measure the voltage if under 12.4 they are unlikely to be very useful. 12.4v is around 80% SoC depending on battery type. I'd say they could still be ok if they're over 12.0v Link to comment Share on other sites More sharing options...
ditchcrawler Posted December 20, 2019 Report Share Posted December 20, 2019 49 minutes ago, blackrose said: 12.4v is around 80% SoC depending on battery type. I'd say they could still be ok if they're over 12.0v But they may have no capacity if heavily sulfated Link to comment Share on other sites More sharing options...
WotEver Posted December 20, 2019 Report Share Posted December 20, 2019 7 hours ago, ditchcrawler said: But they may have no capacity if heavily sulfated Indeed, but they won’t have a shorted cell. 1 Link to comment Share on other sites More sharing options...
blackrose Posted December 20, 2019 Report Share Posted December 20, 2019 (edited) 8 hours ago, ditchcrawler said: But they may have no capacity if heavily sulfated True, but you wouldn't know that from a voltage reading anyway. That's why I said they "could" be ok... Edited December 20, 2019 by blackrose Link to comment Share on other sites More sharing options...
WotEver Posted December 20, 2019 Report Share Posted December 20, 2019 43 minutes ago, blackrose said: True, but you wouldn't know that from a voltage reading anyway. That's why I said they "could" be ok... And you were right Link to comment Share on other sites More sharing options...
beerbeerbeerbeerbeer Posted December 20, 2019 Report Share Posted December 20, 2019 My poor understanding of batteries: don't introduce poor batteries to a bank because they’ll drain the good ones. The good ones wanting to top the weakest. So, you’d need to know if the batteries you want to add are at least as good as the ones you’ve got. ? Link to comment Share on other sites More sharing options...
WotEver Posted December 20, 2019 Report Share Posted December 20, 2019 20 minutes ago, Goliath said: My poor understanding of batteries: don't introduce poor batteries to a bank because they’ll drain the good ones. The good ones wanting to top the weakest. So, you’d need to know if the batteries you want to add are at least as good as the ones you’ve got. ? Yup. See post 2 Link to comment Share on other sites More sharing options...
beerbeerbeerbeerbeer Posted December 20, 2019 Report Share Posted December 20, 2019 1 minute ago, WotEver said: Yup. See post 2 Ok. Cheers. ? Link to comment Share on other sites More sharing options...
mrsmelly Posted December 21, 2019 Report Share Posted December 21, 2019 Whenever I buy a boat I buy a new set of batteries and fit them the day I pick the boat up. Not knowing the history of batteries can be more trouble than its worth. Bin and replace with new and charge em plenty. Link to comment Share on other sites More sharing options...
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