[PSUBS-MAILIST] battery compensation

[Alan James via Personal_Submersibles]

Hank,my computer is dying so fired that last email off before I lost it.With the relays, depending on the type, you may need to drill themto let oil in to equalize the inside or they may crush. You couldpressure test solid state relays if that is what you are using.Alan
 

      From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Friday, January 15, 2016 5:48 AM
 Subject: [PSUBS-MAILIST] battery compensation
   
Thinking ahead, I need to reduce the weight of my deep diver.  I am now planning external batteries- lead acid in oil.  This reduces the amount of syntactic foam needed.  My deal on CNG  tanks fell apart.  The ebay seller would not honour the sale, can't blame him.   I may go with store bought syntactic foam if business looks good with 30 dollar per barrel oil, Yikes.  
I am not sure how to go about the oil filled battery set up.  I assume the batteries are filled as high as possible with water then topped up with oil, then the compartment filled with oil and a rubber lid on that.  I assume you take a syringe with distilled water to top the batteries up from time to time.  This way you wouldn't have to drain the oil.Does anyone know how heavy a battery weighs under water compared to in air?
I also am thinking about having the reversing relays for the motors in the oil tank to reduce the amount and size of wires penetrating the hull.  I will just send small wires for messaging to the relays.Hank
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