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Battery SOC monitor from reliable source

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Simon:
We got some batteries. Then we asked the "manufacturer" about a SOC monitor. They told up all about their awn device and then sold us something off Amazon/ebay/ali-whatever/anywhere else for 3x the price.

I am being asked to find something with more certain supply. Well supply of these things is certain from that many sources but the repeatability of the product is not certain. Can anyone recommend a unit that we can more reliably get with the same specs we got one last time. I really don't want to design my own.

Siwastaja:
What batteries, rechargeable or non-rechargeable, maybe AA alkaline cells, or car start batteries, or maybe lithium ion battery packs, phone battery, home energy storage system, EV battery??

Simon:
Lithium ferrous phosphate 48V

thm_w:
Can it just be a voltmeter, or does it have to display the percentage charge?
We are not talking about a coulomb counter right?

Link for reference (never tried this one): https://eelbattery.myshopify.com/en-ca/products/lifepo4-battery-monitor-10-100v-digital-battery-capacity-tester-percentage-level-voltage-temperature-switch-meter-gauge-12v-24v-36v-48v-lcd-display-indicator-panel

EPAIII:
And just how can you actually tell the state of a battery's charge without counting the charges going in and out? I have seen the performance of charge displays that rely on Voltage and they stink.

Oh, and it should also have some mechanism for remembering and adjusting the actual capacity of that battery over it's lifetime as it deteriorates. Without such a mechanism, you are going to be caught with a dead battery sooner or later.




--- Quote from: thm_w on February 29, 2024, 10:44:20 pm ---Can it just be a voltmeter, or does it have to display the percentage charge?
We are not talking about a coulomb counter right?

Link for reference (never tried this one): https://eelbattery.myshopify.com/en-ca/products/lifepo4-battery-monitor-10-100v-digital-battery-capacity-tester-percentage-level-voltage-temperature-switch-meter-gauge-12v-24v-36v-48v-lcd-display-indicator-panel

--- End quote ---

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