The Anker 511 Nano 3, named the best budget USB charger in a Guardian test of 22 different models, has had its price cut in a seasonal sale. Its combination of compact size, strong power output and low cost make it a standout for anyone wanting a reliable, portable charger to keep in a bag, car or kitchen drawer, and the discount makes it even better value for buying multiple units.

The charger normally costs $19.99 but is now available for $15.99 (with some listings showing it as low as $12.34). Weighing just 0.08lbs with folding prongs, it delivers 30W of power – more than many similarly sized rivals that max out at 20W – and sustained testing showed it could hold 30W for 30 minutes and 20W for a full hour without dropping performance. It also supports four voltages and the programmable power supply standard for broader device compatibility, and carries a TÜV Rheinland safety certification, a feature the reviewer notes many cheaper competitors lack.