5% Better than Specified - 105Ah LFP Battery Tests

Hakadi Battery 105Ah prismatic LiFePO4 (EVE) cells tested.
hakadibattery.com/products/eve-lf105-lifepo4-3-2v-105ah-battery-grade-a-prismatic-cell-for-boat-rv-ev-solar-system
Capacity test results:
Cell 1 - 112 Ah
Cell 2 - 111.1 Ah
Cell 3 - 111.5 Ah
Cell 4 - 110.8 Ah
Internal resistance:
All cells - 0.29mΩ to 0.30mΩ - at all states of charge (newly supplied, fully charged and fully discharged)

[@2000jago]

One of those will keep my solar weather station going for quite a while...

[@TheEmbeddedHobbyist]

I like it, fast burning fuel cell and slow burning end caps. You seem to have pegged it. 🙂 Now all you need in the shed is a few battery hens 🙂

[@markflack9191]

Looking forward to see you putting these to good use.

[@ericklein5097]

That’s about right. I believe EVE LF105’s (Grade A less than 6 months old) will yield ~111Ah typically. If you buy “Grade A” cells and they just barely pull capacity then you didn’t get Grade A. EVE test report sheets are fairly easy to find online so even if you buy another brand you can get a rough idea of what a Grade A of a specific size should pull….except maybe the LF280K’s…those things are just silly, they all pull over 300Ah each so about 10% above their rating.

[@chillipaste2183]

Dear Julian.... you have been an inspiration to me since I bought the magazine EPE with you fruit machine design. (It was a while back) When will you go back to basic circuitry design? Gosh.... you were the first one to explain MOSFETS to an idiot like me. In the meantime I have advanced in circuit design through your wisdom that you generously shared! Enough videos of ready-made boards from china exist already. Much love and respect from Namibia. 🍻

[@Franksey180]

Interesting. I enjoy Julian's content anyway and have purchased some items based on his videos. @Julian, maybe some videos reviewing some of your older deisgns/circuits/projects would also be good content?

[@JulianIlett]

Thanks Chilli. As components get smaller and my visual acuity declines, I'm finding it easier to work with modules rather than components.

[@hi-tech-guy-1823]

one of cells the will Run LoRa - Ripple & Meshtastic for a few years

[@ahaveland]

10 A is only about 0.1C so results would be optimistic. Try measuring capacity at 0.2C, 0.5 C and 1C too.

[@john_in_phoenix]

All of my EVE 104 cells measured above 108ah using 0.2C charge and discharge rates. The 104 an 304AH cells from EVE are high quality. The spec sheet rates the capacity at 0.2C rates, and you should probably avoid a 1C rate unless you really only want a battery that only lasts an hour.

[@JulianIlett]

Ha ha. It took 4 days to do the 0.1C tests. Anyway, moving on to the next video now.

[@ahaveland]

@@JulianIlett Well, 0.2 C should be a little less than half the time and give more standard results that everyone else uses. LFP battery prices are falling quickly, and suppliers have learned from youtubers' feedback - I just snagged a 51V 5kWh rack mount for about £1000 and saved a lot of time and hassle by not having to source all the components separately and then making a hash of it with DIY! I'll use it as a solar charged EV range extender.

[@evekenna3625]

Sorry just to clarify, it’s battery operated and get pleasure from !!! 😘

[@evekenna3625]

Hi, I have a hand machine 😉i dropped in my bath stopped working, how do i bring it back to life!!

[@adhdengineer]

there's not much point balancing LiFePO4 cells below about 3.4v, the discharge/charge curve is so flat.

[@john_in_phoenix]

It's actually counterproductive if they are poor quality cells.

[@barrieshepherd7694]

Sounds like decent equipment performance. Can't see how a swelling cell would move the metal endstop as it is screwed down into the base.

[@john_in_phoenix]

You would be surprised at the amount of force that swelling cells can exert. Splitting wood and bending metal are not uncommon when people overcharge cells.

[@pederb82]

That's an excellent BMS. One of the only ones on the market that does balancing properly! :) The others use a resistive balancing, often even only during a charge. On this large a cell it dont matter how many years a BMS like a Daly try to balance, it cant do jack .... vs JK BMS fixed in one cycle :)

[@john_in_phoenix]

My JBD has kept my cells in balance for 5 years now, but that is a sample size of 48 cells. If you top balance properly, and have quality cells the passive (actually they are all active) work fine. The "active" balance is good for low quality cells, but you shouldn't believe everything a youtube "influencer" is paid to tell you. Test it yourself, I did. Technically speaking, "passive" balance (actually a transistor is turned on to discharge across a resistor) only while charging allows you to maximize the amount of energy actually stored. An active balancer has considerable losses (approximately 50%) when transferring energy from one cell to another, and if not done properly will actually imbalance a pack if not restricted to operation only above 3.45v volts (especially with poor quality cells). Really, you should test yourself, I did. There is a reason Tesla, Rivian and others don't use active balancers.

[@paulwright8378]

In written terms is that 445.3ah

[@JxH]

* Ah With units, uppercase / lowercase is typically critically important.

[@ahaveland]

Amp hours are meaningless without voltage, so use watthours instead. 105 Ah at 12V has the same energy capacity as 420 Ah at 3V or 26.25Ah at 48V but they all have the same 1260 Wh capacity.

[@paulwright8378]

@@ahaveland but he discharged each cell to around 111ah doesn't that add up and he linked them in series so it's definitely 12 to 14 volts

[@ahaveland]

@@paulwright8378 No. Amp hours don't add up in series, only in parallel when the voltage stays the same. 1 amp hour at 1000 V is the same energy as 100 Ah at 10 V. Watthours add up regardless because that is like the volume of a bucket. A cell's nominal (average) voltage is 3.2 V. 111 Ah at 3.2 V is a quarter of the energy capacity of 111 Ah at 12.8 V. Problem is that people have been using amp hours as a unit for too long, and it's only easily comparable when everything is 12 V. Get used to thinking in Wh or kWh instead of amp hours, then you'll always be able to know how big the bucket of energy you have is, regardless of what voltage it has.

[@jlucasound]

Hi Julian!! 😃🤩😍🔋⚡👍