If you're often interrupted by these dreaded warnings before your day is over, and a power source is usually out of reach, you may want to consider a portable charging solution for your Apple iPhone 6S or iPhone 6S Plus. Battery cases are bulkier and heavier than most standard cases, but that's because they have built-in batteries to give you the extra juice you need to get you through the day.
There are a few factors to keep in mind when deciding which battery case to get. The most important consideration is battery performance. You'll find that some cases boast higher-capacity batteries than others, but what matters is how well they work in real life. Another important factor to consider is how much protection the case offers your iPhone 6S or 6S Plus. Many cases boast shock-absorbing materials and designs, and some even meet or exceed military specifications for shock and impact resistance. If it's good enough for the Marines, it's probably good enough for your phone. Less expensive cases focus on performance and offer only basic protection that could lessen the damage from lighter drops, but little else.
Most battery cases add significant bulk to your iPhone. If you'd rather not carry around the weight of a battery case, you may want to check out one of the hybrid designs we've reviewed, like the PowSmart iPhone 6S battery Case, which entails a lightweight, slim case that fits into a separate battery section that you can pop on only when you need to charge up.