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Tools for JK BMS owners
Small calculators we use ourselves when we prepare a box for a JK pack. Free, no sign-up, nothing stored.
Which JK board do I have?
Type the model printed on the board, PB2A16S20P for example: series, balance current, cell count, rated current and whether the box reads it.
Open the tool →LiFePO4 settings helperUsual values for each setting of the JK app, per cell and for the whole pack, with the reason behind each one and the matching inverter values.
Open the tool →Balancer time calculatorHow many hours, then days, the active balancer needs to close a gap between cells, and when a manual top balance is the better idea.
Open the tool →Runtime calculatorHow long your pack will last tonight at your consumption, down to your cut-off.
Open the tool →Keep reading
Stop carrying your phone to the BMS Bluetooth range
Order JK BMS Monitor and read your pack from anywhere in the world, with the free Cloud.
Pre-order for €49Pre-order price · €59 from 10 Nov · ships on 10 November 2026 · free cancellation until dispatch