There are currently many types of portable chargers on the market, so to choose a suitable product, housewives should grasp 4 important technical criteria to be able to use them effectively as well as ensure safety.
Battery capacity
The capacity of 10,000 mAh or 20,000 mAh printed on the box packaging is the theoretical capacity of the battery core at a voltage of 3.7V. However, to charge the phone, the current must be increased to 5V.
Therefore, the important parameter to check is "Rated Capacity". A good quality backup battery usually has a conversion efficiency of about 60 - 65%. For example, a 10,000 mAh battery usually only provides about 6,000 - 6,500 mAh, equivalent to nearly 2 full charge times for a standard iPhone.
Output capacity
The charging speed is determined by power (Watt - W) and charging standard compatibility. For smartphones, you should choose a charging that supports power delivery standards or quick charging with power from 20W - 30W to shorten charging time.
For laptops/tablets, you should use portable chargers with USB-C ports supporting PD with high power, minimum from 45W, 65W or up to 100W to ensure stable power inflow.
If using a low capacity (5W-10W) charger, the backup battery will be slow or even not charged when using and charging.
Battery core technology
The battery core structure determines the durability and size of the product. Like Lithium-Ion (Li-Ion) batteries - old technology, commonly seen in cheap lines. The disadvantage is that the size is thick, heavy and the lifespan is reduced rapidly after a period of use.
Lithium-Polymer (Li-Po) uses new technology, common in high-end lines. Li-Po core helps the backup charger to be thinner and lighter, the discharge flow is more stable and safer, minimizing the risk of fire and explosion.
Safety features
A standard backup charger must have a smart power management chip. This system plays the role of automatically shutting off current when fully charged, preventing short circuits, controlling temperature and stabilizing output current.
Housewives should also prioritize products with full international safety certifications such as CE, FCC, RoHS on the packaging to ensure safety when used as well as product durability.
