I've worked hard over the past few years to move away from disposable alkaline batteries and replace them with rechargeable equivalents. After all, there are some great brands of rechargeable AAA, AA, ...

At only 1.3 pounds, the Anker Prime power bank is about as light as three iPhones put together, so it doesn't add much weight to a backpack or purse. This is very convenient if you carry a laptop bag ...