Daly BMS is Bricking Older Products!

Just the Facts:

  • Two 100 Ah BTR Power batteries W/ Daly BT BMS’s
  • Batteries Manufactured in late 2019 
  • Daly updated  the app software that bricks 2019 and earlier BMS’s
  • They have no fix or solution

If you see LFP batteries that use this app: Do Not Purchase!

These days the number of OEM’s that use Daly BMS’s has shrunk dramatically, but they’re still out there, so be careful!


Inquiry sent  To Daly June 2026


If this back & forth with Daly does not amuse you, I don’t know what will?

In June of 26 I tried to access the BT data on two 100Ah BTR Power  100Ah  LFP batteries I only have these batts  because, no matter what the owner  did, he could not get them to balance. I was planning to attempt some balancing tricks, I have up my sleeve to fix them.

When he dropped them off, my Smart BMS app connected & worked fine. In May, I got a new phone, which forced an app update. This Daly update bricked both batteries! No problem I thought, I’ll reach out to Daly? Bad Idea! Daly customer service is actually worse than Renogy or NOCO. Hard to believe, I know.

These back and forth emails went on and on through July, August & September with asinine cut-paste responses from Daly but zero solutions were offered.

As can be seen below, they were insanely out of balance. Even when charging at just 13.9V (left red arrow) one cell was at 3.747V when the absolute max voltage for LFP is 3.65V. The BMS would also shut off balancing on its own (right red arrow)? It also never even set a fault! No problem, I know how to get into the back-end, and I will correct the parameters. Wrong!

I received no response from Daly so I sent this:

July 21

The Daly Debacle

For a few years, Daly BMS products were among the most commonly used battery management systems in the DIY LFP world. They were inexpensive, widely available, and has a glossy red paint job.

Unfortunately, a quick tour through DIY Solar, EV, boating, and battery-building forums revealed a recurring theme: many experienced users eventually replace them with something else, something more reliable.

The #1 Daly Complaint: Crap Software

Aug 20th 2026

If there is one criticism that appears almost universally, it’s the Daly software ecosystem.

Users routinely complain about:

  • Bluetooth connectivity issues
  • Apps that crash or freeze
  • Configuration settings that don’t save
  • Devices that refuse to connect
  • Poor translations and confusing menus
  • Balancing that doesn’t work

Daly Balancing Performance is Awful!

Another common complaint involves cell balancing. Many Daly models utilize very low  passive balance currents, 20-30mA, and often  dt begin balancing until very  high cell voltages. Users frequently report persistent cell imbalance despite extended charging periods. Other owners have discovered that balancing does not activate until cells reach 3.6V, on factory built batteries, which is far above where many educated LFP  users prefer to even operate their cells.

In practical terms, a weak balancing system can allow cell drift to accumulate over time, reducing usable capacity and potentially causing premature high-voltage or low-voltage disconnects.

Reliability Complaints Continue To Surface

After my experience, I began searching groups & forums for a solution. There were not any, but What I found, was horrifying.

Forum discussions contain numerous reports of:

  • Random shutdowns
  • Communication failures
  • Bluetooth modules dying
  • BMS units entering fault states that cannot be cleared
  • Units that become completely unresponsive

Several users reported replacing multiple Daly BMS units within only a few years of service. Others describe systems that worked normally for months and then suddenly stopped functioning without any obvious cause.

While every manufacturer has failures, the sheer volume of similar complaints, across unrelated communities, is really difficult to ignore.

Questionable Fault Handling

One particularly concerning category of complaints  involves MOSFET control and protection functions.

Many users have reported situations where the software indicated discharge MOSFETs were OFF while current continued to flow. Others describe fault conditions that could not be cleared or protection systems that appeared to behave unpredictably or outside of the defined parameters. These batts should have set a fault at anything over 3.65V but, did not. They also disabled balancing, all on their own, anytime a cell exceeded 3.65V.

For an LFP battery system, especially aboard a boat, protection circuitry must behave predictably. A BMS is not the place for surprises.

Customer Support Complaints

Customer support is another recurring sore spot. I got to deal with this first hand, it’s abysmal!

In my first communication I told them, right up-front, the batteries were made in 2019.

They very easily could have just said; “Sorry that product is no longer supported and the current apps will not work with it“. Instead, they let this drag on for almost five  months with weeks between responses.

They also forced me to destroy two batteries demanding  model & serial numbers! The battery cases were glued together thus destroying both cases. After battling the cases and glue I managed to find model numbers but in this vintage Daly never even put serial numbers on the BMS! They assured me it was on the bottom of the BMS. One would think the actual manufacturer would have known this?

Pound Sand Buddy


After nearly five months they  finally said this:
“Your product is too old to use the new app, use  the Smart BMS app.“,

I had told them numerous times I was using that app and it still did not work. Then they wrote this little gem:

“If Smart app fails to connect, it means it’s not supported. We recommend you buy a new BMS.”

Daly could have very easily told me this upfront,  and I never would have used a Daly BMS again.

To be fair, I knew long ago how bad Daly was. However,  I did not buy these batteries a reader did. When he got fed up, he dropped them off with me to see if I could fix his chronic balancing problems. I typically avoid negative articles but Daly earned this one!

The final response from Daly. Yes, this is how they treat paying customers.


How does one take a photo of the problem when the BMS is dead? Their app update bricked my BMS and it will not connect, so no, I can’t take a photo.

Not Everyone Hates Them

To be fair, not every Daly owner is unhappy. Some users report decent service. Others state that the hardware itself functions adequately while criticizing only the software and communication modules. Like many low-cost products, experiences appear highly variable but, the resounding tone is Daly sucks!

The Bottom Line

The biggest problem with Daly BMS products is not necessarily that every unit fails. The problem is consistency and horse-shit, insulting customer service!

Keep in mind they are selling  these for  batteries that have a bare-minimum 10-12 year life.  Then they brick older models and have no intention of fixing that.

Bricking your BMS within 7 years? Fahk you Daly!

Across battery, solar, EV, and marine forums, the same complaints appear over and over:

  • Weak balancing performance
  • Buggy software
  • Bluetooth communication problems
  • Reliability concerns
  • Difficult troubleshooting
  • Horrible  support

As a result, most  experienced DIY builders  migrate to reliable alternatives such as JK BMS,  JBD/LTL, ANT, Heltec or Seplos BMS systems, which are routinely praised for better software, more robust balancing capabilities, and greater configurability.

The BMS’s we see the least complaints with are JBD/LTL Power. Companies such as Vatrer, Li Think  and some Epoch models use JBD and we almost never get BMS complaints.

For a marine LFP installations, where reliability matters more than saving a few dollars, a BMS should inspire confidence. Judging by the number of Daly replacement threads found online, many users eventually decide that confidence is better found elsewhere.

My recommendation?

Treat Daly BMS’s like they are the Bubonic Plague and steer clear!

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