PowMr 12V 100Ah LiFePO4 Lithium Battery $176 Shipped @ PowMr-Top eBay

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FLICKIT on 06/03/2025 - 22:44 ebay.com.au (178 clicks)
Last edited 06/03/2025 - 23:08

MCBT20

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If you want more than one battery use this listing: https://www.ebay.com.au/itm/156283987550 (for 4 they're $163 each)

Specs and such are here: https://powmr.com/products/lithium-battery-100ah-12-8v

As with all cheapie LiFePO4 batteries the specs are a little questionable, it is what it is…

These cheapie LiFePO4 batteries 'seem ok', I purchased a 200Ah one a while back, the capacity seems all good, initial testing using a Victron Smart-shunt to measure things, draining it down to 12v gave me 195.5Ah (12.11v resting voltage, roughly 10%), recharging it to 14v = 199Ah.. (I don't push my batteries to the extremes)

This company sell a lot of solar controllers, inverters and such, I suspect they're like Renogy and they just slap their name on gear made by other companies, but at least they have a name and a lot of sales, unlike a lot of the super-cheap battery sellers these days…

eBay code T&C's: https://pages.ebay.com.au/buyer_coupons/2025/mcbt20/

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• 

  dna level c on 06/03/2025 - 23:37

  +1

  Wow, so low.

  Let’s roll the dice, I have been in the market..

• 

  noz on 06/03/2025 - 23:38

  Excuse my ignorance, but I take it if I had a 240V appliance that draws 600W, this battery could run it for close to 2 hours (notwithstanding battery quality / true capacity discrepancies)? Can you recommend a 240V inverter that would work with this battery? Cheers.

  • 

    FLICKIT on 06/03/2025 - 23:51

    +1

    Inverters generally have around 85 to 90% efficiency, so 'close' to 2 hours would be pushing it…

    I have a cheapie Renogy 1000w inverter I purchased on a deal here a few years ago for $170, it's ok, I mainly grabbed it because I had plans of travelling with an ebike and I wanted to use it to charge that, and because it has pass-through, it can be used as a UPS, but I've never really used it for anything other than as a load for testing batteries… (The cables that came with it are very light, I assume they're aluminium so I use my own homemade copper cables.)

    People here on OzB have posted about significantly cheaper eBay inverters, from memory about $120, so hopefully they'll step up tomorrow and make some recommendations ;)

  • 

    AmperSand on 06/03/2025 - 23:51

    +2

    You need to factor in inverter efficiency too.
    Unlikely you would get 2 hours. You wouldn't want to discharge a cheap LiFePO4 to 95/100% discharge.
    Be good to see someone run it through it's paces though, its a damn good price.

    • 

      noz on 07/03/2025 - 00:31

      I assume its BMS would prevent it from going that low .. or is that a bad assumption?

      • 

        FLICKIT on 07/03/2025 - 00:43

        +2

        In their specs the 'over discharge voltage protection' is listed as 10v which is very low… If true it's designed for safety, but it's not healthy to drag the battery that low often… As with all cheapie batteries it wouldn't be wise to be bumping off the BMS limits on a regular basis…

        I believe these contain JBD BMS's, it seems all their OEM BMS's have these settings these days…

        • 

          noz on 07/03/2025 - 00:58

          @FLICKIT: Cheers .. how would you know the voltage .. would you need some type of voltmeter rigged up to the battery at all times?

          • 

            FLICKIT on 07/03/2025 - 01:10

            +1

            @noz: Yeh, it's always wise to monitor your system, either with a volt meter or a shunt, you generally get a feel for your usage and such fairly fast anyway..

            I run Victron Smart-shunts on my batteries, they come up on eBay deals for around $110, but there's quite cheap chinese shunts around for like $30 I believe…

            A shunt measures the current flow in and out of the battery so you get an accurate measurement of what's going in and out of the battery, and how much capacity you have left… You can use a basic volt meter but lithium batteries tend to hold their voltage for most of their cycle, so relying on just voltage isn't really that accurate…

            • 

              noz on 07/03/2025 - 01:18

              +1

              @FLICKIT: thanks mate, appreciate your solid info (and from everyone else who has replied too).

      • 

        Igaf on 07/03/2025 - 00:54

        +2

        Ebay spec says 10V - that's a typical number but too low imo. Whether the BMS actually does the job is a different matter. Google tests on this brand, they should tell you.

        Teardown here: https://www.youtube.com/watch?v=sJwdLMl1Vew

        • 

          FLICKIT on 07/03/2025 - 00:59

          @Igaf: I was going to post that teardown vid but the cheapies seem to switch around manufacturers and change designs so often it may not be accurate or relevant now…

          Edit: re-watching that, I'm not a fan of the foam packing design with no real chassis or such, but I do like they have screwed connections on the BMS, intact QR codes on the cells (so not recycled cells), and such…

  • 

    Igaf on 07/03/2025 - 00:38

    +2

    Roughly 100 minutes counting inverter inefficiency (~80%), and 10-20% less if you stick to the recommended 80/20 or 90/10 DoD strategy to prolong battery life. Depending on the appliance you may also need to know/factor in the appliance startup draw and make sure your inverter's peak power can manage that.

    You want a 12V inverter. There are hundreds to choose from depending on your needs (physical size, power output, pure sine wave, outlets req'd etc) and wallet. Don't use one so can't advise. If you research and pick a couple of possibles make sure you then check reviews. You pay much more for brands like Victron etc. Caravan forums are good starting points.

• 

  FLICKIT on 07/03/2025 - 00:21

  +2

  To add to my OP… I mainly purchased one of their 200Ah batteries (a couple of months ago) to power an electric bow-mount trolling motor on my tinny, and to use it as extra power in my campervan as needed, or to use in the house with an inverter if/when there's power outages, a portable battery that's easy to move around…

  I started work on it yesterday, the plan is to mount it in a SCA safe-case, the case will include a Victron Smart-shunt, mega-fuse, some Anderson sockets, and such, it's a work in progress:

  https://imgur.com/a/3TLSXJL

  (I'll post pics of the finished project in a couple of days if anyone's interested?)