No es necesario ponerle nada, o eso me han comentado, el chino por defecto declara que es algo que vale 20 euros, o que es una bateria reaparada, aun asi si te quedas mas tranquilo ponle algo asi:
Hi,
Could you help me to avoid customs taxes, declaring a valour as lower as posible?, and please send me the item via dhl, I think is better in spain to avoid customs, thank you
