The Anker 321 MagGo power bank has been discounted to $20 as part of the Amazon Spring Sale. This is a record low price and represents a discount of 23 percent. A variety of colors are available, including white, black, pink, green, and purple.

Anker products are well-represented on our list of the best power banks and portable chargers, so this device is in good company. The 321 MagGo is, as the name suggests, a magnetic power bank that attaches to the back of smartphones. It is compatible with cases, as long as the case is magnetic. Inside, there’s a 5,000mAh battery that provides up to 19 hours of additional use for modern iPhones.

Anker

This is a record low price, but for Prime members only.

$20 at Amazon

It’s equipped with heat sensors that continuously monitor temperatures to avoid accidental damage and it can charge a phone while it’s being charged itself. This power bank is also compact, so it easily fits into pockets, bags, and purses.

The only downside is that this is only for Prime members. The same goes for the Anker MagGo 3-in-1 charging station, which has been discounted to $88 from $110. However, the Anker Nano 3-in-1 portable charger is on sale for everyone. This non-magnetic charger includes a large 10,000mAh battery and is currently $35.