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The charge (no pun intended!) of battery power tools shows no signs of receding at any time soon – both professional users and homeowners are coming round to the benefits of battery, with less noise, lower vibrations and no emissions at the top of the list!

And if you’ve taken the plunge and invested in a STIHL cordless power tool, there are plenty of ways that you can make the most of it. We’ve put together an expert guide to understanding and looking after your battery so that it can deliver the performance you expect from STIHL. Read on for our top ten battery hints and tips:

  1. Clean power tools will use less battery power

Tools that are kept clean work with less friction, which means that less power is needed to run the tool and your battery will run for longer. Make sure that all parts of your machine (such as the saw chain or brushcutter cutting tools) are free from dirt and well lubricated.

  1. Don’t use damp or wet batteries

Trying to use a wet battery in your cordless power tool is a bad idea, but if it does get wet or dirty, simply switch off the machine, remove the battery, wipe it down with a cloth, then put the battery somewhere under cover and let it dry. If the openings in the battery or the charger is dirty, clean them gently with a soft brush.

Make sure that the battery’s contact points don’t come into contact with anything metal either as this can damage it.

  1. Charge the battery correctly

AK30 and AL100The optimum temperature for a battery during charging is between 0°C and 40°C. Batteries may not charge if they are colder or hotter than this. Both the AL 300 or AL 500 chargers have an integrated cooling function which actively cool the batteries whilst charging.

  1. Get to know the LEDs on your battery

Most people know that LEDs on the battery can be used to show how much charge you have left in the battery. But do you know, they can also indicate faults? If the LEDs are red, instead of green, any of the following could be causing a problem:

    • One red LED means that the battery is too hot or too cold. If the battery is too cold, slowly warm it up (e.g. by leaving it inside for a while) but don’t put it on a heater or radiator as it is likely to get too hot too quickly. If the battery is too warm, it might be obvious but you need to let it cool down! If you have an AL 300  or AL 500 charger, you could put a warm battery on charge as these chargers actively cool the batteries whilst connected.
    • Three red LEDs continuously lit up means that the machine itself (rather than the battery) is too warm – again, just allow it to cool down before using it again.
    • Three red flashing LEDs means that there is a fault in the tool, and you should take it to an approved STIHL dealer where they will be able to assess it.
    • Four red flashing LEDs means there is a fault in the battery. Again, take it to an approved STIHL dealer  and they will be able to help diagnose what sort of fault it is.

Battery LEDs Table

  1. Get to know the LED on your charger

Charging begins automatically when you put your battery into your charger. All STIHL chargers have an LED display and again, this can be used to show up faults with the charger:

    • If the LED on the charger shows as green then changes to red, your charger is carrying out a self-check after being plugged in.
    • If the LED on the charger is green then your battery is charging as normal.
    • If the LED flashes red, there is something wrong with your charger – take it to an approved STIHL dealer and they will be able to assess it for you.
  • If the LED does not light up at all, your battery may already be fully charged as the charger automatically switches off in this case. If the battery isn’t fully charged and the charger is properly plugged in, take it to your approved STIHL dealer who can investigate further.
  1. Charging little and often

Charging your battery often but for short periods of time, to continuously top up the battery is absolutely fine and will have no effect on the battery’s performance.  The battery can also be removed from the charger at any time without any problems, so you can easily charge your battery whilst you stop for a cuppa!

  1. Lithium Ion batteries and deep discharge

Deep discharge causes damage to batteries and reduces its long-term capacity so you get less charging cycles. STIHL’s intelligent battery system monitors the voltage in the individual Lithium-Ion battery cells so that it is impossible to exhaust or over charge the battery and damage it in this way.

  1. Speedy charging times won’t affect lifespan

We have two quick chargers (the AL 300 and AL 500) for those of you who don’t have the time to wait. Some people think that charging a battery quickly will reduce the overall lifespan of the battery but this isn’t the case with STIHL power tool batteries. Both of these chargers actively protect the battery during charging, thanks to the in-built cooling function, so that batteries can be charged hundreds of times over without a noticeable loss of capacity.

  1. Storing the battery

We don’t recommend that you store the battery in your power tools. Take it out and store it separately in a clean, dry place out of direct sunlight and ideally in some packaging, such as cardboard, to protect it. It can be stored at a temperature between -10°C and 50°C. If you aren’t going to be using it again for a while, we suggest leaving it with a charge level of 40–60% (or two green LEDs). Please also make sure it is kept out of reach of children.

  1. Choosing the right battery for your power tool

We always recommend a specific battery for all of our cordless power tools, and it might not be the one with the biggest capacity. That is because we take into account weight and balance as well – for example, when using a hedge trimmer, a lighter battery will make the tool easier to use. With the batteries in the COMPACT cordless power system, the AK 20 will run for twice as long as the AK 10, but it weighs 0.4kg more than the AK 10.

HSA 86 and BatteryThink about how you will use your power tool, battery and charger. Will you have time to charge the battery so that you have a long enough run time for the job you need to do? Should you choose a bigger capacity battery or a quick charger? Or maybe even buy a back-up battery? Either way, we hope this guide to STIHL batteries will help you get the most out of your battery-powered tools, but let us know about any other battery questions you might have in the comments.

Finally, don’t forget to read the instructions before using any power tool. You can download owners’ manuals and safety brochures for STIHL products here.

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