[PSUBS-MAILIST] Repackaged LifePo4?

[Jon Wallace via Personal_Submersibles]

 I agree, buoyancy is a factor but can be addressed by filling the battery pods with lead or concrete weight in replacement of the original battery weight.  I believe I can literally power the entire submarine with just two LiFePo4 batteries if I wanted to.  That's attractive to me in terms of maintenance.
Jon

    On Monday, June 6, 2022, 07:06:11 AM EDT, Rick Patton via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  
 
 The one thing that comes to mind Jon is that the Ksubs buoyancy is designed using the wet cell batteries which may not be an issue but worth considering. Batteries have come so far since the Captain designed his three models and I have wanted to upgrade to a more efficient battery myself but have decided to stick with what’s on the plans due to space limitations and possible weight differences. Rick  

Sent from my iPhone

On Jun 6, 2022, at 6:34 AM, Jon Wallace via Personal_Submersibles <personal_submersibles at psubs.org> wrote:



Looking for some brain-power deductive reasoning.  I've been following some of these youtube channels that teardown LiFePo4 batteries to see what's inside and also test various functions of them.  I've notice with all of them that the actual Lifepo packs are significantly smaller than the container they are inserted into and use padding keep them centered.  At first I assumed this was to prevent chafing of the cells against the container but also noticed that padding is not used on the bottom which seems to me where most movement that might cause chafing would occur.  So I'm left to assume manufactures are simply using padding so they can provide LifePo batteries in industry standard battery group sizes.
Given that the battery pods on K-Subs do not lend themselves well to current battery groups I'm curious what you guys think about repackaging current market LifePO batteries into smaller containers.  I can't see any reason not to do it but am sure there are some opinions out there I would want to hear.
Jon
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