If there is one given in the portable office, it is the need for batteries and ways to charge them. The AA/AAA battery is a staple power source for many devices from mice and keyboards to a myriad of older devices. I have made a conscious decision to use as many USB charged or powered devices as possible, but still wireless mice and keyboards are among the last holdouts in my mobile office.
For years I have used desktop or wall mounted multi-channel charger. The traditional multi-channel charger is heavy, often noisy, and for me, prone to failure. My last four-channel charger has gaffer tape over a dead third channel.
I have found the perfect solution, the SoShine LiFePO4 USB powered charger. It charges a single AA/AAA Nickel Metal Hydride (NMH) or Lithium Iron Phosphate (LiFePO4, LFE) battery.
It is small, light, and fast. It uses the less popular Mini-USB plug, but a cable (USB Type A to Mini USB is supplied) so it can be charged from any USB Charger, laptop or power bank. I now have two of these in my mobile office. They are fast and smart. They do a check of battery condition, and if the battery is no good, they stop and display a single red light. I have also had one shut down charging because I inserver the battery the wrong way round (Duh!).
They are small and light, so slipping two into my travel office is no problem.
If you are using old NiCad, you are out of luck, though… If you are, time to upgrade!