What is the optimum battery charger to use on a long day out to charge a phone, earbuds and tablet? The key to the [best portable battery charger](https://techyassist.net/blog/portable-charger/) is not to read the big number on the box, but to find out what charger is appropriate for the power devices you're traveling with. A small 10 000mAh battery will usually be enough for your phone and earbuds. For people who don't use the outlets for an awful lot of hours a day: It provides additional cushion (just additional weight in your bag).Now it's time to test output. If you require more than one, look for one that has at least two ports, and USB-C Power Delivery for quick charging of your phone. For smartphones, a power of about 20W is sufficient, for tablets and small laptops it is 45W or higher. Remember that if multiple devices are connected to a single charger, then the individual devices' wattage is divided among them, so the more power a charger has the more power available to devices connected to it. It's also convenient to have a model that has pass through charging, which will allow you to charge the power bank as well as your phone through the same outlet overnight.Safety and durability cannot be a compromise. The best portable battery charger will be one that won't over charge the batteries, short out, heat up, and be a reputable brand. An unbranded and cheap device may seem like it has everything that you require, however, they do not last long and you will more likely end up spending more money to get it to operate properly. Do NOT place into the standard 100Wh limit airlines provide for the cabin bag, but carry to the airport in the cabin bag.Some minor details can go a long way towards making a good pick great. Simple visibility of the battery level indicator, non-easily trapped cable, compact design and not too heavy for many months of use.I have always read live reviews prior to buying. One of my favourite sites for gadget reviews, they are honest and when it's posted at their site techyassist , if you feel the review has been truthful, you can buy the gadget from them. After you compare a few of the short listed models in terms of capacity, speed, safety and weight, you will be able to find the best portable battery charger that you can use for your routine.