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hi youtubers  jeff cote here from pacific outsystems  here we've got  a question i've got two flooded lead  acid batteries  in parallel each rated by their  manufacturer at 122 amp hours  since fully discharged of a flooded  battery is 50  does this mean i really only have 122  amp hours of usable battery capacity  with these two batteries in a bank  all right so it's a good question by  will by the way and it's  one that is important because i always  have boaters come back to me and say why  jeff  such a big battery bank well i'm like  what you see isn't what you get  and what wheel is bringing is really  important when you have a flood of lead  acid battery  through experience what we've learned is  that we should not deplete that battery  below 50  we can do so but it comes at a high cost  in terms of shortening battery life  so if we can't deplete a battery below  50  and if you have a battery bank of two  batteries  that are each 122 amp hours that's a 244  amp hour battery bank  but remember because you can't deplete  below 50  the usable amp hours from 100 to 50  is only 122. and that's the reason when  we size the battery bank  you get to have a lot more batteries  than you actually  need or use so that you don't actually  deplete your battery bank  below the 50 threshold for flooded lead  asset batteries  with agm or firefly you can go deeper  lithium again you can go deeper and that  makes more usable battery power  but with a flooded lead acid battery you  definitely wanted stop discharging  at 50 and so rail is right he only has  122 amp  hours of usable battery capacity even  though he has  a nominal battery capacity of 244.  so that's a good question for me thanks  for watching and send me your questions  our way and  we appreciate it