Batt Flattery

When I was starting out in the construction industry, I was told by one of my tradesmen to “run your batteries dead before you charge them”. Being the good obedient apprentice that I was, I followed his instructions without question.

However, after doing some research of my own, I’ve now realised that “over-discharging” (the act of using the tool until the battery is fully dead) can have a detrimental effect on the lifetime of the battery; including death in some extreme cases. Poor battery, he was so young and had such potential.


The popularity of the over-discharging myth is caused by the “memory effect” which many old Ni-CD batteries suffer from. The “memory effect” means the battery remembers the point when recharging began.

When that point of recharging is reached again during the next use, the voltage will drop and power in the tool will ultimately be lost. Hence why the battery had to be completely killed before recharging.

The new era of batteries:

However, this is not the case for lithium batteries! Li-ion doesn’t have the memory problem, so it can be recharged at any time. As soon as the tool starts have a noticeable lack of power, it should be recharged.

Did you know that the depth of the discharge (how flat your battery becomes due to use of the power tool) actually determines the cycle count (how many times you can use the battery and recharge it?)

It is tempting to fix the last couple of screws, but I believe the longevity of your batteries are far more important!

So, when you’re thinking about planing down that timber an extra 1mm with a plainer that sounds like a dying donkey, please stop and put the battery on charge. You will save yourself both time and money.

Click here to learn more about taking care of your batteries:


  • Recharge your battery as soon as you feel it begin to lose power. However, make sure the battery is cool before you put it on charge.
  • Try not to leave a flat battery in your tool box.
  • Charge the battery more often between uses, you don’t need to wait for the battery to die in order to start charging it!
  • Take care of your batteries! Store them away safely, click here to see another Australian owned product to keep them safe! Batteries can be very expensive and you want them to last as long as possible, 48tools have made it even more easier for you to protect your batteries and increase longevity!

Other Helpful Resources:

Here is further information on how best to prolong your Li-ion batteries:

For more in depth information about batteries please check out this incredible resource.

How can I help?

If you would like to learn more about batteries and stay up to date with the latest about my company Batloc,  leave us your email.

Batloc is a product I invented back in 2018, it’s a simple and effective solution towards battery theft on our jobsites. I aim to reduce as much theft as possible on our jobsites so if you found this information helpful please share it around to others so they can gain something from it too!