Anker Zolo 20K 30W (A1689) Review: Handy Cable, Recall History

The Anker Zolo 20K 30W (A1689) is for phone users who want a big bank with its own cable, so a forgotten charging lead never strands them. Independent tests show it delivers most of its rated capacity and the build is solid. The trade-offs are that it can’t hold 30 W for long without heating up, and units from its first production run were recalled for fire risk.

What happened with the Anker Zolo recall?

In 2025 Anker recalled several power banks worldwide, including the A1689, because some units could overheat and catch fire. The UK notice limits it to units made between June 2024 and February 2025. We found no India-specific notice, but Anker’s global recall page takes serial numbers. If you buy now, check the serial on the box against that page, and avoid old stock from unknown sellers. Current production is outside the recall window, but you should still confirm.

How much charge does it really hold?

The German site techtest.org measured 17,700–18,400 mAh at phone-charging voltages, about 89–92% of the rating. At 20 V laptop output it fell to 15,900 mAh, or 80%. That is a good result for a bank in this class; some loss is normal because the cells run at a lower voltage than the USB output.

Will it charge my phone at full speed?

For most phones, yes. The USB-C port and built-in cable support 30 W Power Delivery and PPS, which Samsung phones use for their fast-charging modes. The USB-A port gives up to 18 W. Plug in two devices, though, and every port drops to a shared 5 V / 3 A. techtest.org called this an extreme throttle, and owners charging two phones at once will notice it.

Does it overheat?

Under a steady 30 W load, techtest.org recorded a casing temperature of over 70 °C and output falling to 20 W after about a quarter of the battery was used. Phone charging at lower power was much less affected. In a hot car or a 40 °C summer afternoon, keep it out of direct sun and expect slower charging.

How long does it take to recharge?

TechRadar found it took over four hours from 20% to full, and techtest.org measured about five hours at roughly 20 W. On an old 5 V charger it accepts only about 5 W, so use a USB-C PD charger.

Can I carry it on Indian flights?

Yes, in cabin baggage. At a typical 3.6–3.7 V cell voltage, 20,000 mAh is roughly 72–74 Wh, under the 100 Wh limit. Under the DGCA’s 2026 advisory, you can’t use it to charge devices in flight and shouldn’t keep it in the overhead bin.

What we could not verify

Anker India does not publish a firm MRP for this model, and Amazon.in listings for different Zolo variants vary widely in price and in warranty (12 or 18 months). Check which variant and warranty the listing shows.