Teros eBike Battery Care

Battery Care Summary

The battery stores and supplies electricity to the motor and is the single most vulnerable and expensive part of an ebike. Therefore it is important to know how to properly care for your battery and ensure you experience its full life-time.

To ensure that you maximise the life of the battery please do the following:

 

  • Store the battery between 0-20 degrees in a dry location.
  • Don’t store fully charged for prolonged periods (over a month).
  • Don’t store fully empty for prolonged periods (over a month).
  • Store between 30-60% charged status for prolonged periods (over a month).
  • Park your ebike in the shade or cool location where possible.
  • If you are going away for more than three months without your ebikes ensure that someone can recharge your battery to the recommended 30-60% level every couple of months.

Other important things to know about your battery are:

 

  • Batteries are recharged by a charger specifically made for the battery. Using a charger from another brand could damage or destroy your battery.
  • Most batteries can be charged both on and off the bike — but must be charged in a dry place with a smoke alarm and away from flammable materials.
  • It’s ok to charge overnight but do not leave the battery on a charger for days at a time. The charger will continue pushing tiny amounts of charge into the battery and this will degrade the battery over time. There’s also a rare risk of overheating and fire.
  • Ensure that the battery charging socket cover is over the battery inlet to protect the socket against wet weather and water.
  • When transporting an ebike by car ensure you take the battery off and store the battery inside the car.
  • We recommend using a damp cloth to clean the battery. The terminals should be cleaned occasionally and lightly greased. The battery should be removed before cleaning your ebike. To protect the electronic components, batteries must not be cleaned with direct water contact.

Bosch Batteries

PowerPacks and PowerTubes (2 types of Bosch batteries) are the energy sources for the Bosch Active Line, Active Line Plus, Cargo Line, Performance Line and Performance Line CX eBike systems. Useful pointers on how to determine their range, optimise their efficiency and maximise their service life are provided in the document below.

Battery Care Details

Charging a Battery

Batteries are recharged by a charger specifically made for that battery. Using a charger from another brand could damage or destroy their battery.

Most batteries can be charged both on and off the bike — but must be charged in a dry place with a smoke alarm and away from flammable materials. The state of charge of the battery is often displayed on the battery or can be checked on the handlebar display. Most batteries will charge within 5 hours from empty and range from 3 to 8 hours. The time is determined by the capacity of the battery, how empty the battery is and the charging rate of the charger (from 2A to 6A). Charging runs at maximum current when the battery is below half charge and progressively slows to a trickle above 95% charge.

It’s ok to charge overnight but a customer should not leave the charger on for days at a time. The charger will continue pushing tiny amounts of charge into the battery and this will degrade the battery over time. There’s also a rare risk of overheating and fire. A lithium ion battery will last for 600 - 700 complete charge cycles. If a battery is half full and then charged to full, this would be 0.5 of a charge cycle.

For most people, a 400 Wh battery will last 3 - 5 years, a 500 Wh for 4 - 7 years and a 625 Wh for 5 - 9 years. The larger the capacity, the longer the battery life. Batteries will also degrade slowly with time, so even if there is minimal use, it is unlikely for a lithium ion battery to last longer than ten years.

Storing a Battery

Lithium ion batteries will degrade faster when they are fully charged and left unused. You will get a significantly longer battery life if you minimise the time the battery stays at 100%. If the battery is not going to be used for longer than a month, it’s best to store it at 30 to 60% charge status — or two to three bars on the battery indicator. Every 3 months, charge the battery to 50 - 60%. If the battery won’t be used only for a few weeks, it’s still best to keep below 100% charge at between 20 - 80%.

Store in a cool, dry place where temperatures stay between 0 and 25°C.

More Information About Batteries

Different bike brands and styles of bikes mount the battery in different places. There are benefits for each position

 

In the frame down-tube

On the frame down-tube

Behind the seat post

On the rear rack

A battery mounted inside the down-tube is better protected

Mounting the battery centrally and low makes the bike more stable and closer to the handling of a standard bike. Also easy to take the battery on and off a bike as needed

A rear mounted battery is kept out of the way and allows a normal bike frame

 

On almost all of our bikes, the battery is locked to the bike to prevent theft. The only battery brand without a lock is the Pendix conversion kit battery.

Some brands change their battery case designs every few years trying to set or follow a trend. Their older designs become obsolete leaving customers stranded when they need a battery replacement. Teros chooses brands committed to maintaining battery design and availability for at least ten years.

Lithium-ion Batteries

Teros only stocks ebikes that use lithium ion batteries. These are ideal for eBikes because they offer a much higher energy density and are lighter than other batteries. However, lithium is a volatile element and when damaged or when poorly built, it can generate high temperatures and cause fires.

The safest lithium batteries contain cells made under strict quality controls by four toptier brands: Panasonic, Sony, Samsung and LG. Teros only sells ebikes with batteries from these four brands. We don’t stock any generic lithium batteries from China or elsewhere.

Capacity & Range  

All Teros lithium ion batteries put out 36 volts and come in different capacities

Battery capacity determines running time and travel distance and is measured in either amp hours (Ah) or watt hours (Wh). These are used interchangeably and are related by the formula Watt Hours = Amp Hours X Battery Voltage.

If you are interested in knowing how far you could go on your bike based on your individual needs, try the Bosch eBike Range Calculator tool by clicking the image below.

While the range predictor tool is based on the Bosch motor, you can extrapolate to other motors. Other mid-drives provide slightly fewer kilometres (5-10% less). Hub motors generally provide 50 to 60% of this range. Also worth noting is that motors with higher torque outputs will deplete the battery faster. So the range of the 40 Nm Bosch Active Line is over 10% greater than on the 85Nm Performance Line CX.