New Delhi, Nov. 2 -- My husband's phone is more than 4 years old, and if you ask him, there is absolutely no reason to upgrade to a new phone as long as the current one is still working. However, his phone has started showing signs of wear, particularly around the charging port, which has become loose and often fails to hold the charging cable in place. Buying a new phone is still a few months away, so we started looking for a more convenient solution that would let him charge his iPhone without having to rely on a wired connection.

That was one reason we wanted a magnetic power bank. The other was our frequent work travel, which often leaves us looking for reliable ways to keep our phones and other devices charged while on the move. So,...