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I am trying to shave off as much weight as possible - thinking about swapping the old lead acid battery with a much lighter Lithium Lipo - But I am worried that the DC to DC converter might overcharge it and cause a major problem - can I use a small sealed lead acid motor cycle battery - is it possible to just not have the 12 volt battery and run everything off the DC to DC ? https://earthxbatteries.com/shop/etx18b
 

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Most 12v lead acid to lithium replacement batteries have a built in bms of sorts

That said they have minimal capacity and if they aren’t in a vehicle that is used much can get ruined by a small phantom draw making for an expensive experience
 
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