Reading the model code
BD6A- Family segment, and the part buyers most often read wrong. The 6A is the balancing class carried by every BD6A board, so JK-BD6A24S15PD moves charge at 0.6A between cells — a different figure from anything in the tail of the code.
24S- Maximum cells in series, which is roughly 76.8V nominal with LiFePO4 cells. It is a ceiling: nothing is wasted by running fewer cells.
current position- Continuous discharge position. The spec table on this page lists 150A, and that is the figure to size cable, terminals and the protective device against.
D- Trailing letters. JK-BD6A24S15P is stocked with the same 24S ceiling and the same 150A, so the two codes do not differ in current or cell count. Treat them as different hardware rather than as interchangeable parts, and check connector, mounting pitch and firmware before substituting one for the other.
What actually changes between these codes
The closest step below this board inside BD6A is JK-BD6A24S12P: same 24S ceiling, same 0.6A balancer, only the continuous rating moves, to 120A. US$0.73 separates the two at the base configuration. Size that gap against the load actually drawn, because nothing else about the two boards changes.
JK-BD6A20S15P holds the same 150A continuous rating and changes only the string ceiling: 76.8V nominal here against 64V there. Cell count is fixed by the pack being built, so it is the constraint that comes first.
JK-B1A24S15P is the other candidate for the same pack: 24S, 150A, 1A balancing rather than 0.6A. It sits US$10.75 above this listing at the base configuration. If the cells are matched and the duty cycle leaves idle time, the cheaper of the two is the right answer; if they are not, no protection setting replaces balance current.
26 BD6A codes are priced here, from US$47.98 for JK-BD6A17S6P to US$175.68 for JK-BD6A32S15P; JK-BD6A24S15PD is 16 of that set at US$76.23 before configuration options. The spread across the family is a ratings spread rather than a margin spread, so quote the cheapest code that clears the calculation.