English to Spanish Tech/Engineering Electronics / Elect Eng

'power bank' is a portable charger/battery for small electronic devices. I'm actually using 'batería portátil' in my draft, but I've seen it in Spanish as 'Power Bank' even thought it's used as a generic name: "The headset also comes with a 'power bank' for On-the–Go charging for your convenience", "... plug the cord of the battery pack into...', 'You may use the AC adapter or the 'power bank'...", etc.

I'd rather keep a generic term in Spanish but I don't know if there's a standard translation for 'batería portátil'. I'm using neutral Spanish. Thanks.