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Looking for a programmable DC load with a Wh cutoff

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captainscarlet:
Hi,

I have an application where I need to discharge batteries to a known capacity.
They're 1.05Ah at fully charged, and I need to get them to 75% and 50% state of charge. The discharge voltage curve is very flat so I was hoping there was a DC load that would integrate discharge energy and stop at a particular value.
The alternative is to build a battery management solution with coulomb counting, but I don't want to build a custom board if a product already exists.

Does anyone know of a product that does this?
Pros would be low cost and ease of use as it will likely only be used for this one application.


Thanks all.

Kean:
Assuming they will start in a fully charged state, you can use a smart DC load at a fixed current for a specific time.
Many of the traditional bench DC loads require PC control, or have a complex menu system, but there are some "low cost" devices available with this feature implemented.

For example this one https://www.aliexpress.com/item/1005007433497815.html

I've not used one, so I cannot vouch for this particular unit, but the specs look quite good for the price.  Probably massive overkill for your needs.

Kean:
I forgot to say - how accurate does it need to be?  If it is just for preparation for shipment, then I imagine you just need to be below the specified capacity threshold.

As I suggested, if they are initially fully charged, and are in similar (i.e. new) condition, the discharge curve should be relatively predictable for 50%, maybe even 80%, of capacity.

nctnico:
The Korad KEL2000 series has a battery test mode which can stop when it reaches a certain Ah level during discharging.

mtwieg:
I use the iTech 85xx series, they have this function (called "Battery mode"). Might be overkill for your purposes though.

edit: actually it cuts out at a voltage or amp-hour threshold, not a watt-hour threshold.

https://www.itechate.com/en/product/dc-electronic-load/IT8500plus.html

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