It may sound obvious to keep your Ryobi power tool battery charged, but unless the drill is being used regularly, then most people forget about it until the next time they need to use it.
That is not a good thing in terms of ensuring a long life. Batteries need to be charged and used regularly as that will help keep them functioning to their maximum capacity. Ideally a battery will charge best when it is around 70% of its capacity.
The Complete Discharge Theory
You may have read that you should not charge a battery until it is fully discharged. That is not actually true. You only need to do that about once a month and at all other times you can charge it as and when you may need to use it.
Always allow your battery to FULLY charge – When you do have to give it a quick charge, then leave it plugged in until it is fully and completely charged.
There is often a strong temptation to stop the charging, especially if you are in a hurry to finish a job, but it is strongly advisable to wait a few minutes and make sure the battery is 100% charged. That practise alone will really add a lot of life to your Metabo drill battery pack.
It is why we here at Tool and Go recommend always having 2 batteries. You can be using one and allow the other spare battery to fully charge. If you are someone who uses power tools every day, I am guessing you already have worked out that having two batteries is just a great idea.
Lithium-Ion batteries should in theory work forever because they work on the movement of ions. However, like any product, their general treatment and care, temperatures and aging process will also have an impact on these type of cordless drill batteries for Milwaukee.