[Elusive Porpi]

In my 18' sterling, i was running a 24V system with group 24 size batteries. They lasted all day with heavy sight fishing all on the trolling motor. I have since gone to Lithium's. I bought them online from china. $230 a piece plus 200 shipping. They are 60AH batteries @ 19# a piece. I have fished 2 long days straight on these with out charging and have yet to see an issue.

 

[Elusive Porpi]

I am currently using a AGM as my house battery. But my next battery will be a lithium. As i bought the batteries from China, this was a trail run for them and didnt want to sink too much money into this. Looking back at the shipping cost, i should have just bought a 3rd battery and be done with it.

AH wise, my research shows lead acid can run down to 50% and Lithiums' down to 15% usable AH's. So there is a ~35% gain in usable AH's in Lithiums.
As I've stated earlier, I couldn't kill the 60AH lithiums in 2 days of fishing.
These batteries also charge incredibly fast. After the 2 days of fishing, each battery charged in 2.5 hrs a piece. From what i read, lithioms can charge very fast with no side effects to the battery.

As far as source, It was off Alibaba. the link is below.
Looking back at my reciept, the total shipped to my house, which took 37 days, was $774.50. This includes 2x 60AH 12V batteries, and a 20 Amp single bank charger.
https://www.alibaba.com/product-det...779.html?spm=a2700.8443308.0.0.10853e5f6jUYcS

THese are the batteries installed in my boat. they are smaller than a group 24

US $248.0000

 

[Elusive Porpi]

Please note lithium batteries have serious hazards associated with them. If they are overcharged, they can catch fire and essentially melt a boat. They have internal charging circuitry that is required to regulate the charging cycle unlike a lead acid battery. A failure in that internal regulator can easily cause a fire. Lithium itself will catch fire when exposed to water as well.

Their have been recent airplane fires due to lithium issues. Samsung notoriously had lithium battery issues that set phones on fire. Lithium batteries are an impressive technology but it is still a new technology that comes with additional risks. Given the rate of equipment failure on a boat (water intrusion, vibration, etc) I would be very cautious about new technology that can effectively sink a boat in seconds.

Also something to keep in mind if a lithium battery catches fire, pretty much nothing puts it out until the entire battery is consumed. A fire extinguisher is of no use.

This is a blanket statement which severally exaggerates any issues. Every cell phone in the WORLD has lithium batteries in it. That is probably a billion phones. Yes there are bad batteries, just like anything else. I have also seen lead acid batteries explode in cars and equipment as well. These were also Lithium-Ion Batteries, not Lithium Iron Phosphate batteries. The lithium-iron battery has superior chemical and thermal stability.

These batteries are also tested and certified CE,UL,MSDS,Test Report from National Center For Quality Supervision and Inspection of Battery Products approved

 

[Elusive Porpi]

Just be careful what you read. If you take the lithium to 50% DOC you will kill the battery very quickly. Talking ~200 50% DOC cycles vs ~2000 to 85%. Lithium has an incredible power density but has to be managed very well. A good quality charger is also a must. Constant amps that switches to constant volts to prevent over charge.

I'm confused on what you are speaking of. Are you saying it is better to run the battery down more?
the Chart below is for Relion Lithium 60AH battery. It shows a DOD chart which show that even with 100% Depth of Discharge, you will still have 80% battery capacity after 2000 cycles. that is 38 years if you recharge once a week.

https://relionbattery.com/products/lithium/rb60-x