EcoWatt Energy

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Brendale, QLD
EcoWatt Energy

An Australian owned and operated company specialising in the highest quality lithium based technology

An Australian based company with a focus on providing High Quality Lithium products that are built to withstand the harsh environments of the outback!

20/08/2026

𝗔 "𝟲𝟬𝟬𝗔𝗵" 𝗕𝗮𝘁𝘁𝗲𝗿𝘆 𝗧𝗵𝗮𝘁 𝗖𝗼𝘂𝗹𝗱 𝗡𝗼𝘁 𝗙𝗶𝗻𝗶𝘀𝗵 𝗮 𝟯𝟬𝟬𝗔 𝗖𝗵𝗮𝗿𝗴𝗲.

We also tested one of the popular budget 600Ah lithium batteries on the market. Charge current: 300A. For a 600Ah battery, that is only 0.5C. Half its capacity rating. Any quality LiFePO4 battery should handle that comfortably, all day, without breaking a sweat.

This one could not.

It accepted just 423Ah before internal temperatures climbed too high and overtemp protection shut the charge down. It never completed a full charge at 300A. At half its rated capacity in current, it overheated before it was full.

Why does this happen?

The same story we keep seeing in cheaper batteries. Heat is the giveaway. Lower grade cells with high internal resistance turn charge current into heat instead of stored energy. Generic BMS MOSFET temperatures climb fast under sustained current when the board is not built for it. Likely undersized internal cabling and busbars adding even more resistance, and more heat, to the path. Every one of those is a place where corners get cut to hit a lower price. The thermal protection is doing its job. The problem is the hardware underneath it generating all that heat in the first place.

The capacity on the label means nothing if the battery overheats before it can take charge and deliver it at its rated currents.

20/08/2026

𝗘𝗦𝗦𝗣𝗥𝗢𝟯𝟬𝟬 𝗦𝗹𝗶𝗺𝗹𝗶𝗻𝗲 𝗶𝗻 𝗮 𝟳𝟵 𝗦𝗲𝗿𝗶𝗲𝘀

One of our customers sent through photos of their 79 Series setup, and it's a great example of how the slimline format works in a vehicle where space is tight.

The ESSPRO300 sits neatly behind the seat. It's a 12.8V 300Ah LiFePO4 battery, 3,840Wh in total, in a slimline case designed for exactly this kind of position where a standard battery box won't fit.

The charging side is a Victron Orion-Tr Smart 12/12-30 DC-DC charger and a SmartSolar MPPT 100/50 mounted alongside, so the battery charges from the alternator while driving and from solar when parked. Keeping the whole system in one spot behind the seat.

Inside the case are A-grade EVE LiFePO4 cells and a JBD Smart BMS with Bluetooth, so battery status, current draw and cell voltages can all be checked from a phone.

A tidy install and a good reference for anyone planning power for a 79 Series or similar cab-constrained build.

19/08/2026

𝗪𝗲 𝗣𝘂𝘁 𝗮 "𝟯𝟭𝟰𝗔𝗵" 𝗕𝗮𝘁𝘁𝗲𝗿𝘆 𝗼𝗻 𝘁𝗵𝗲 𝗕𝗲𝗻𝗰𝗵. 𝗔𝘁 𝗙𝘂𝗹𝗹 𝗥𝗮𝘁𝗲𝗱 𝗢𝘂𝘁𝗽𝘂𝘁, 𝗜𝘁 𝗟𝗮𝘀𝘁𝗲𝗱 𝟳𝟱𝗔𝗵.

We recently bench tested one of the popular budget 314Ah lithium batteries on the market. The spec sheet looked impressive. The test results did not.

Discharged at its rated maximum output, it delivered barely 75Ah before overtemp protection shut it down. That is less than a quarter of its claimed capacity.

We then tried to recharge it at 200A. Same story. It accepted just 120Ah before cutting out again (in sub 20 celcius ambient as well).

So what is actually going on inside?

Heat. Under real load, the BMS MOSFET temperature shoots up fast. That points to undersized components that cannot carry the current they are rated for. Likely undersized internal cabling and busbars. Lower grade cells with higher internal resistance, generating excessive heat every time you push them. The thermal protection is doing its job. The problem is the hardware underneath it forcing the shutdown in the first place.

These are exactly the places a cheaper battery cuts corners. You cannot see any of it from the outside. You only find it under real load, when you need the power most.

17/08/2026

Save a few bucks, grab a cheap battery with a generic BMS. Just don't count on it to protect you when it really matters.

More to come.

11/08/2026

A new battery always looks good. The first few cycles prove nothing.

Almost any lithium battery performs well when it is fresh out of the box.

We recently bench tested a 300Ah battery from one of the biggest names in Australian camping and touring. A brand almost everyone has heard of. Purchased new, at full retail, to see what happens beyond the honeymoon period.

When new, it actually looked impressive. It accepted 326Ah on charge, more than our own 300Ah battery shows on the same test.

Then we pushed it to a full 300A load, the same continuous current our 300Ah battery is built and tested for.

It cut out under load. Charging and discharging. It could not complete a single full cycle at that current, even with an industrial fan running on it the whole time to keep temperatures down.

Here is the part most people never get told.

That big 326Ah number is not a bonus. It is actually the tell.

There are two very different types of lithium cell on the market. High discharge cells, built to handle sustained current, and ESS storage cells, built for stationary solar and grid storage where the battery is drained slowly over many hours.

Storage cells are cheaper, and they often carry bigger amp hour numbers when new. But most are rated for only 0.5C discharge, and some as low as 0.25C. On a 300Ah battery, that is a maximum of 75 to 150A, when a 3000W inverter at 12V draws around 250 to 280A on its own.

Based on the higher capacity when new and the cutout under load, this battery appears to be built on storage cells. They are excellent cells for the job they were designed for. A 12V touring battery running inverters, fridges and compressors is not that job. For 12V applications, the cell should be rated for at least 1C.

None of this shows up on a spec sheet. And none of it shows up in the first few weekends away (sometimes longer).

What matters is the cells, the BMS, and the battery's ability to handle high current and the heat that comes with it.

That is why we build with EVE LF304 cells and a JBD 300A Smart BMS. Both are built to handle 1C charge and discharge all day, not just on day one.

06/08/2026

We put the ESPRO628 through its maximum rated discharge. 300A continuous. Flat out from full until empty.

That is over 3,700 watts of constant draw, and the battery held it for 2 hours and 9 minutes straight.

The result? 644Ah delivered at maximum load. Most batteries fall short of their sticker rating at a fraction of this current. The ESPRO628 beat its rating at the hardest test we could run on it.

We also ran a slow 50A discharge for comparison. 653Ah.

This is what Grade A cells and a properly built JBD BMS look like on a bench tester. No marketing numbers, just the printout.

03/08/2026

0.002V cell variance at 3800W.

We are mid way through another 300A discharge and charge test. That screenshot is the ES300 pulling just under 300A, and the four cells are sitting within two thousandths of a volt of each other.

That is what Grade A matched cells and a high quality BMS look like under real load. Cheap cells drift apart or die the moment you push them.

Full data coming shortly.

28/07/2026

Here's what most people miss about winter camping in Australia, it's quieter, clearer, and cooler in ways that make every campsite look like a different country.

No school holiday crowds. No heatwave. Just proper nights under the stars and mornings cold enough to make your coffee taste better than it should.

Your adventure doesn't have to wait for summer. And with the right power setup, it won't.

EcoWatt Energy. Built for adventurers who don't stop.

Link in bio to find your battery.

17/07/2026

Full to flat in about an hour. This is what a serious battery looks like.

We took the ES300 to the bench and did something most 12V batteries simply cannot handle. We pulled a full 300 amps out of it, continuously, from a full charge all the way down to cutoff. No warm up, no tapering off, just a flat out discharge from start to finish.

The result: 304 Ah delivered in almost exactly one hour.

That is the entire rated capacity of the battery, and then some, emptied in 1 hour and 48 seconds at a genuine 300 amp load.

Here is why that matters. A lot of cheaper lithium batteries cannot even deliver the numbers printed on their own label. Ask them for their rated current and the BMS trips out on over current or over temp protection. Ask them for their rated capacity and you get back noticeably less, because lower grade cells and loose cell matching sag hard under load and tap out early. The specs look great on the box. The bench tells a different story.

The ES300 did the opposite. It gave back more than its rated 300 Ah, at a full 300 amp continuous draw (3840w), with under one volt of sag the moment the load hit and a rock solid voltage plateau across the whole run. The battery reached a maximum of 55 celcius despite being built in a super confined space.

That is what genuine Grade A cells and a properly built BMS deliver. Real numbers, straight off the bench, no marketing fluff.

Australian owned. Built to be pushed.

Full discharge curve in the image below.

14/07/2026

𝐈𝐟 𝐲𝐨𝐮𝐫 𝐥𝐢𝐭𝐡𝐢𝐮𝐦 𝐛𝐚𝐭𝐭𝐞𝐫𝐲 𝐨𝐧𝐥𝐲 𝐥𝐚𝐬𝐭𝐬 𝟓 𝐲𝐞𝐚𝐫𝐬, 𝐭𝐡𝐚𝐭’𝐬 𝐧𝐨𝐭 𝐚 𝐠𝐨𝐨𝐝 𝐝𝐞𝐚𝐥.

That is a sign you probably bought the wrong battery.

A quality lithium battery should be built to last decades of real-world use, not start fading after a few camping trips, touring seasons or off-grid weekends.

At EcoWatt Energy, our batteries use premium A-grade EVE and REPT cells, rated for over 4,000 cycles at 80% depth of discharge.

Cycle it once a day, and that is more than a decade of daily use.

We also use a JBD Smart BMS on every 12V unit, helping protect the cells, balance the charge and keep the battery performing properly for the long haul. You can even monitor your battery live from your phone through the Bluetooth app.

So instead of replacing a cheap battery every few years, buy one that is built to last.

Address

1/268 Leitchs Road
Brendale, QLD
4500

Website

http://www.ecowattenergy.com.au/

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