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hi youtubers jeff cote here from pacific  yacht systems  we've got a question from richard  richard asks  i have a two battery setup as it came  from the factory one engine battery and  one house battery and both  are 85 amp hour 12 volt batteries  they're sealed the boat came with a 40  amp  pro nautic which is from pro mariner  charger  would you say this is too big and advise  if i need a smaller charge  richard well richard good question  so we all know that or should know that  when we size a battery  or a battery charger for a battery we  want at least 10 percent  of the battery capacity as a charge rate  so in this instance we've got two  batteries one deep cycle and one  engine battery but let's call it you  know just for the sake  85 amp hours times two is 170 amp hours  of capacity  10 of that 10 of 170 is 17 amps  so certainly the battery charger here is  adequate and can easily handle  recharging both batteries  because as we can tell it's actually not  close to 10 percent it's close to 25  of capacity now pro nautic is a great  charger  and there's nothing wrong with having  too big of a charger because again  since it's voltage regulated the battery  will eventually  tell the charger not directly but as the  voltage of the battery rises the charger  will actually start pulling back  and will not over charge the battery so  there's no need to change that battery  charger  but it's good for the for richard here  richard now has the ability of adding  batteries without having to worry about  increasing the battery charger size  so thanks for watching and send your  questions our way and hopefully we'll  get them on our  youtube ask pyx section  you