When you need a custom battery pack, the following are the 7 things you should share with the battery manufacturer:
– Working Current consumption
– Pulse load profile
– Working voltages(Max /Cut-Off Voltage)
– Expected battery service life
– Temperatures Range(Operation&Storage)
– Mechanical requirements (Like max space available )
– The application
The Custom Pack team could help apply the UN38.3 shipping document for your custom Lithium-ion batteries as well as IEC62133 for battery packs build.