Re: Got 4Ah, not 5Ah, battery 18V (20V) - done right thing?

"Bob La Londe"  wrote in message news:v28jc3$2cs45$1@dont-email.me...
On 5/17/2024 2:41 PM, Jim Wilkins wrote:

...

I think its more likely adjustment of the internal BMS depending on how
the larger battery is configured to make it larger.  For instance if it
has an extra bank of cells it can 100% certainly deliver more current.
Just like tying two car batteries in parallel gives you more current
capacity.  I expect larger cells might also be capable of more current
if the conductors are sized accordingly.
Bob La Londe
CNC Molds N Stuff
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Beyond the BMS limits, the capacity and internal resistance depend on details of the chemical formulation and physical structure, such as particle size, which may be trade secrets. I've read that they can be traded off depending on the intended load current, higher resistance for greater capacity and vice versa.
https://www.linkedin.com/pulse/what-does-c-mean-lithium-ion-batteries-bruce-feng
Marine batteries are similar, the high capacity deep cycle ones for trolling motors aren't recommended for engine starting current.