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12V 100Ah LiFePO4 Lithium Iron Phosphate Battery $195.20 Delivered ($185 each for 2, $168 each for 3) @ Fab-Living eBay

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12V 100Ah LiFePO4 Lithium Iron Phosphate Battery $195.20 Delivered ($185 each for 2, $168 each for 3) @ Fab-Living eBay
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PTheNachoman180 on 25/10/2024 - 14:10 ebay.com.au (2743 clicks)
Last edited 25/10/2024 - 15:38 by 1 other user
OCTF20OFFOCTSNS

12V 100Ah Lithium Iron Phosphate Battery LiFePO4 Rechargeable Camping RV

These have pouch cells and are usually sold as 'Gentrax' brand. They arrive with Gentrax branding on the batteries and a Gentrax user manual. Comes with bolts for terminals in a secure package brand new with wrapping tape. I believe they're the exact same internally as the Adventure Kings 100Ah but have yet to see someone tear down those for comparison.

Here is a teardown of the Gentrax shown here. https://imgur.com/a/gentrax-100ah-06-2024-8lnWTqM

I have personally tested these in parallel (3 batteries) and pulled 315Ah. Meaning these are 105Ah each.

EDIT: If you need multiple, now's the time. I've just added 3 to cart for a $505 total. $168 each. This is an all time low price.

Electrical & Electronics 100Ah 12V Battery LiFePO4 Lithium Battery Rechargeable Battery

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closed Comments

    • bamzero on 26/10/2024 - 14:04

      I'd take a guess that the max discharge current of 100A on that one is peak, not continuous. Most likely 50A continuous same as the max charge current, so you're better off with the BMS in this one.

      Plus you're going further into noname territory, don't know what the actual capacity will be. At least these have had quite a few people test and at start with their rated capacity if nothing else.

      • ozhunter68 on 08/11/2024 - 10:33

        I am also guessing 100Amp peak discharge (3-30 seconds) as the specs don't give too much away. They state

        50Amp charging, which could be a hint, but I had a Ampare LiPo4 battery that also stated nominal charge

        current of 40Amps+- and it tested to have a decent 100Amp continuous discharge current, but it was more $.

  • Daddy Chill on 25/10/2024 - 18:55

    Damn I wish I had the money

  • tellhimhesdreaming on 25/10/2024 - 19:41

    I keep thinking it should be possible to make a really cheap UPS using these but somehow seems like there aren't any good lithium UPS controllers?

    Does anyone know an affordable pathway?

  • adelliah on 25/10/2024 - 20:14

    Suitable as a starter battery for boat motor (115hp if that makes a difference)? Or only as a 2nd battery?

    • Flyerone on 25/10/2024 - 21:15
      +2

      No not ideal. It might start it but these batteries are only rated to burst current of 200A for 5 seconds and I think you might need a DC to DC charger if you want the alternator on the outboard to charge this while it's running, as a main or even secondary battery on the same charge circuit. If it was just on a separate circuit for running a fridge, lights, sounder or electric motor etc then of course it would be fine.

      • Horacio on 25/10/2024 - 22:02

        The BMS on this won't allow 200A at all, CMIIW

      • adelliah on 26/10/2024 - 07:13

        Thanks for that, hopefully some agm deals come up then

  • fantacular on 25/10/2024 - 21:34

    Any good deals on a dcdc charger?? Need to replace AGM battery but will need a full system upgrade

    • ozhunter68 on 08/11/2024 - 10:36

      I used to use an expensive Redarc, but now using the 30Amp Dune/Annaconda one and it works well too.

      Even the Mobi on ebay works well and the Ampare too (friends use them).

  • blackeyed on 26/10/2024 - 00:03

    Newbie question…Can this be used to power dashcam if I don’t want to hardwire it? And can this battery be charged by 12v socket?

    • OzzyOzbourne on 26/10/2024 - 09:15

      If your dashcam is 12v then yes (via an appropriate fuse). If it's 5v (most typically have 12-5v adapters), then you will need an adapter and fuse.

      No, it can't be charged directly from 12v. You will need a 12v to lifepo4 battery charger.

      Not sure how having an enormous battery on the floor with fuses, adapters and cables going to a dashcam, plus a separate charger, is any better than a wire from the vehicle fuse box. Certainly not safe IMO

      • blackeyed on 27/10/2024 - 16:21

        Ok thanks mate, I will go for hardwiring

  • cheaptech20 on 26/10/2024 - 21:40

    I have a garden shed 2.1 x 2.4m I want to charge my mower etc 18V batteries on and maybe power a light. Any suggestions on all the kit I'd need and where I can get it?

  • feisty on 27/10/2024 - 12:39

    Bought 2 of these at this sale. One charges to 14.2v the other 13.7v I'm having buyers regret as i wanted to put them in parallel in the camper. I should have not been so tight when the voltx ones were on sale. Ill speak to the ebay vendor and see if I can get a return on the 13.7v one. It might just be surface charge although it doesnt appear so after ive drained the top 10% of the batteries

    • Ezekiel2320 on 27/10/2024 - 12:50
      +1

      Specs say it should charge to 14.2-14.6 so you shouldn't have any trouble arguing a case for replacement. Don't tell them you plan to parallel them because these aren't designed for that, even though it will probably work

      • feisty on 27/10/2024 - 13:14

        Awesome help mate!!!! I didn't read that and are new to the Lifepo4 world. Yes I was very hesitant to parallel these and read a heap of threads where people said they had without issue. Im now thinking they just did it without any understanding of what they were doing. I can see why they don't want parallel as it seems a bit of a lottery as to what you get and you would be lucky to get two the same Thanks again

        • TheNachoman180 on 27/10/2024 - 14:55
          +1

          These charge to a 13.4v float. After charging wait 5hrs then test the voltages.

          • feisty on 27/10/2024 - 15:25

            @TheNachoman180: Two identical batteries charging to such different voltages though. Ive spent the last hour reading forums wtc and most people seem to get to at least 14.2v. Although those that didnt aeem to get an accurate capacity reading when tested. Ill see what the aeller says.

          • feisty on 31/10/2024 - 15:22

            @TheNachoman180: Ended up returning both. One as a return and one faulty. 0.4 degrees difference the two after a day with no load. . 14.4 and 14.8 the bms in the good battery would constantly be working. Might try the voltx

        • Ezekiel2320 on 27/10/2024 - 14:58

          The reason these aren't designed to be in parallel is that the BMS inside each battery can balance the cells inside each battery, but they have no way of communicating with each other so if there's a major difference in some cells between the two batteries you will get in trouble

          • feisty on 27/10/2024 - 15:28

            @Ezekiel2320: Yes. Hence why I was hoping to get similar spec batteries and then Id be happty to try it. But nearly a volt difference isnt what I'm willing to take a chance on. Ive messafed the seller who has a very high feedback rating. So I am hopeful they will agrree 13.4 is too low.

            • TheNachoman180 on 27/10/2024 - 19:43
              +1

              @feisty: Mine have no problem charging to 14.4v when on charge at high amps. All 3 after being left 5hrs go back to 13.4 by themselves

              • feisty on 27/10/2024 - 20:05

                @TheNachoman180: Cheers mate. Thanks for the info. Ive only got 5 amd 1 amp lithium capable chargers. Both Noco. Ive kept charging and then using about 10 amps from each hoping for a change from the 2nd battery. Im now seeing a max charge of 14.4 and 13.4 before the charger goes into float mode. The company have great feedback and sell lots of lithium so I dont see theyll have an issue swapping it fingers crossed. In hindsight I really should have gone the 200 when it came on sale

                • ozhunter68 on 08/11/2024 - 10:48

                  @feisty: These Gentrax batteries are one of the best around below $250-$300 (they have solid BMS)

                  and sounds like you just got a bad cells in one of them which even happens with

                  expesive batteries too.

                  • feisty on 08/11/2024 - 12:34
                    +1

                    @ozhunter68: It does seem like a bit of a lottery as to what you get but that is the same with lead acid batteries too from my experience. I returned them both. Paid postage for the good one and the seller paid for the other. They said both were fine and then took $60 off the refund and tried to charge me for postage on to of that…….. 50 messages later a very frustrated me put in a dispute. I got mu full refund an hour later. Strange behaviour from a seller with 100% feedback and lots of sales. Reading the feedback there were about 20 neutral feedback posts that should have been negative. I'll for the voltx to come on sale although I am tossing up buying the ecowatt battery deal that came up yesterday. I spoke to the seller and he seems like a decent bloke. Thanks for your input.

    • Ulysses31 on 22/11/2024 - 19:27

      Thanks for posting. I have a camper, and 200ah of AGM doesn't last in summer. Maybe I'll go bigger on the solar.

  • Sleepycat3 on 28/10/2024 - 12:32
    +1

    Not a fan of pouch cells. Mine all fail by swelling. I prefer cylindrical or prismatic LFP cells instead now.

  • morokigg on 30/10/2024 - 12:48

    I purchased one of these and it was a Gentrax branded one that turned up anyway.

  • eug on 11/11/2024 - 01:25
    +6

    I received mine a few days ago and just did a test. On my first charge/discharge cycle I got 106.8Ah / 1370.5WH out of it with a 10V cutoff and 5A load (so around 60W).

    Graph here if anyone's interested.

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