Here's a quick recap of what to ask before you commit:

1. Fit: Does this device match your customer's usage patterns? Test it yourself.
2. Cost: Calculate the true cost per sale, including DOA and returns.
3. Support: Know the supplier's return policy and DOA replacement process.
4. Compliance: Verify age-verification tools and state laws. Check your platform's capability.
5. Seller red flags: Ask for batch traceability, spec sheets, and samples.

For more on battery tech, check out how power design shapes the whole product line — that'll help you understand what to look for in a device's specs.