These are the two primary types of battery, and you will see these used in phones and tablets. There are pros and cons of each, but when it comes down to your powerbank, lithium polymer is the clear winner. Lithium ion batteries are the older and more out of date version.
These batteries are known to self-discharge. This means that even when not in use, the energy stored gradually decreases. While it is not a huge amount, any loss of charge is a bad thing when it comes to a powerbank. This is not an item like a phone which you are going to use every day and charge most nights. For a mobile phone, it hardly matters if the self-discharge rate is a few percent per month, because it will be topped up and recharged on a daily basis. However, when it comes to a powerbank, the whole point is that you can leave it for ages and know that it will still be fully charged and ready to charge your phone when you need it. A lithium polymer battery does not suffer this self-discharge, which can be as great as 2% per month in lithium ion batteries. As a battery self-discharges, the voltage gradually deteriorates. This means that after a certain number of cycles, a lithium ion battery will have a decreased capacity, so this balances out the initially high energy density of this style of battery.
Lithium ion batteries have a bad reputation when it comes to safety. If overcharged or overheated, lithium ion batteries can be hot to the touch, can lose function, and in extreme cases can spark or combust. To avoid this, most lithium batteries tend to short circuit when overheated, essentially ending the life of your powerbank and possible damaging the device plugged into it. Good quality lithium ions are equipped with added safety features to combat their generally lower safety ratings, but it is best not to even risk having to rely on these features. Instead, trust a battery that is in general far safer.
The lithium polymer is the battery that addresses many of the lithium ion issues. It is the next step in the advancement of the humble electronic battery. Why use yesterday’s products when the latest and greatest new designs are here, new and improved? Technology is advancing at such a rapid rate, that when it comes to buying a new gadget, it makes sense to buy the most recent product so as to stay on top of things for longer. Older models are just going to become redundant or be deemed incredibly inefficient compared to the competition in a year or two.
Don’t be fooled by the lower prices of lithium ion batteries; you get what you pay for. Everyone knows that they are the older, worse and outdated product, and so they try to sell them off quickly. We are the resident experts when it comes to powerbanks, so have a chat to Powerbanks Australia.