The ten questions to ask before paying for a lithium pack.
Questions for the supplier
Ask for the cell maker, the BMS model, a test report for your pack, the warranty terms and two references.
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Questions about the specification
Confirm voltage, usable capacity, BMS current limit, charger profile, cycle life at your temperature and the certification list.
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Questions
Short answers to the ones that come up most.
What should I ask a supplier first?
Who makes the cells, and can you show the test report for the pack you are quoting me.
What should the invoice state?
The specification, the warranty terms and the certification set — not just the model number.
What is a red flag?
A price far below the market with no cell or BMS named.
