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Old 04-19-2019, 07:50 PM   #1
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Default Next Upgrade - Lithium Iron Batteries

Look what FedEx delivered. Four lithium iron batteries. At 100Ah continuous current each, this should make boon docking a whole new experience. So - currently working the placement, storage and protection issue. They're group 27 size, so a bit larger than the 4 group 24 RV batteries I had.
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Old 04-19-2019, 09:42 PM   #2
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Wow!! Beautiful. I gotta look into those sweet things. Do they come in a group 31 size?
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Old 04-20-2019, 12:22 AM   #3
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Looks great, you shouldn't have any issues now with that setup. I manage to boon dock with one battery but do not use much power obviously. If I do in the future I will set it up like yours. Silverado
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Old 04-20-2019, 05:53 AM   #4
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Funny thing about the size - they're kind of their "own" size at 12.75 x 6.875 x 9. Seems that's somewhere between group 27 and 31?
For the 4 lead acid batteries I made the battery tray larger by moving the propane tanks forward and used a 8D NOCO battery box. Won't work for the lithium iron.
I'm going to try and find a box that I can cut the bottom out of and slip it over the batteries for security and protection.
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Old 04-20-2019, 10:59 AM   #5
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What is the weight per battery?

Lighter or heavier than lead/acid or AGM type?
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Old 04-20-2019, 11:13 AM   #6
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They're Battle Born batteries and weigh 31lbs each. My old Interstate lead acid were about 41lbs each. So-I'm also saving about 40lbs which helps offset adding the two generators on the rack over the propane tank. I've got a lot of weight on the front, but I've got an F350 that's "more" truck than I need for the small camper. That and the equal-i-zer hitch help distribute the weight better.
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Old 04-22-2019, 11:35 AM   #7
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Default Cost of Lithium Batteries

Great Battery setup. Lots of power....But Amazon lists the cost at $949 per. Is that correct?
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Old 04-22-2019, 01:15 PM   #8
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Yeah - they're expensive. But 3000-5000 cycles. 10-year warranty. Double the power! Plus the ability to discharge 100%, and each one is 10lbs lighter.
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Old 04-22-2019, 04:35 PM   #9
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And they are smaller, right? So I think you can pack four of them into the space that two ordinary batteries would occupy. That's huge, for those of us who want to increase our available amp/hours.
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Old 04-22-2019, 04:44 PM   #10
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Plus, it looks like Lithium Amp Hours are not the same as regular amp/hours -- the capacity is doubled! You can get 100 amp/hours out of a 100 amp/hour lithium unit, while you can only get about 50 from a comparable lead/acid battery.

So that means if you have two ordinary batteries, you could theoretically get away with one lithium?

This is from the Battle Born site:

Batteries are rated in Amp hours (AH), when you look at a lead acid battery there are a few things that are not clearly represented. The reserve capacity is the actual amount of power in the battery, most the time this number is based on a 20 hour discharge rate which is extremely low and very rarely happens in real world systems. And you can only discharge a lead acid battery to 50% at this 20 hour rate before you start to damage the battery. If you discharge the battery in less than an hour you will get less then 40% of the power.

Lithium batteries are designed to be discharged nearly 100% and at a high rate without losing performance or power. Li-ion deep cycle batteries are rated with (LAH) because they are essentially double the power of a lead acid battery.

For example if you had a 200 amp hour AGM battery you can essentially pull 100 amps out of it over 20 hours. If you want to pull the power out in hour you will only start with 120 amp hours.


When you are cycling a Battle Born LIFEPO4 battery you can get the full 100 amps in an hour. Essentially you would need a 200 amp hour lead acid battery to produce the same amount of power in an hour.
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