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We all have different requirements from a battery. It’s important to be realistic and think about how you will be using your e-bike. While no-one wants to be caught short with a lower battery capacity than is needed for their regular trips, it is also not ideal to be riding around carrying a bigger battery if it’s significantly larger than needed.
There are a few things to consider when deciding on the ideal size of battery for your particular type of E-Bike riding;
How far are your regular trips between charges?
How often do you want to charge your E-Bike?
How Hilly are your rides? Or do they involve lots of stopping and starting?
All these factors can influence the capacity of battery which would suit your riding.
The capacity of the battery determines the battery range. As a guide, a 36v 10ah battery should give 360 watt hours, and if you are riding at 200watts, this will last for under 2 hours. Keep in mind there will also be some left-over power that the battery won’t use, to preserve itself. You might want to presume about 1.5 hours of riding without pedalling. If we assume we are applying an equal amount of power as the motor through pedalling, we can double this, which should get the average person about 3 hours per charge, or somewhere around 60kms at an average speed of 20km/h (on the flat)
Luckily E-Bike riders can have a direct impact on the range given by their battery. There are several influencers of battery range, these are similar to the factors affecting fuel economy in a car. Once you are aware of what these are, making some tiny changes can add up to some extra ‘Free!’ battery range…
Temperature - Not too hot or cold
Terrain - Avoid steep hills
Stop / Start Accelerations - Avoid! Try to keep moving if possible
Weight - Don't carry unnecessary items
Aerodynamics - Tiny improvements make a difference
Mechanical efficiency - Keep your E-Bike well maintained
Read our detailed blog here on maximising battery range.
The world of E-Bikes can seem like a whole new language, with terminology and metrics which can seem a little bewildering at first. Here is a quick breakdown of battery jargon:
* Battery Capacity is measured in Amp Hours(Ah) or Watt Hours(Wh) - See above example in 'Battery Range'
*Volts / Voltage is a measure of electrical flow (36v/48v)
*Watts is a measure of power
*BMS is short for Battery Management System / Circuit Board. This vital part, manages and controls the cells in the battery pack.
We have ridden our batteries ‘as hard as we can’ to test them out, and we state the capacity of the packs we sell as VERY CONSERVATIVE MINIMUM DISTANCES (as in, you should achieve these distances if you’re not chipping any barely at all, the ride is mainly uphill into a head wind, your tyres are a bit flat, etc). This table shows our Minimum Range for each of our 36v frame mounting packs, when being used with the average 250w motors. Adding your own regular riding effort will get you 50 - 100% more range, and if your riding on Rail Trails, you might get in excess of 3x these distances.
To get an idea of the time you can ride for on a charge, we can do some basic electrical maths, helped by the WVA Triangle!
So, a 36v 10ah battery should give 360 watt hours, and if you are riding at 200watts, this will last for under 2 hours. Keep in mind there will also be some left-over power that the battery won’t use, to preserve itself. So you might want to presume about 1.5 hours of riding without pedalling. If we presume we are applying an equal amount of power as the motor through pedalling, we can double this, which should get the average person about 3 hours per charge, or somewhere around 60kms at an average speed of 20km/h (on the flat).
If you need to use two batteries we have a specially designed and manufactured Dual Battery Unit which allows two batteries to be used either consecutively or at the same time. Ideal for those longer trips, allowing you to venture much further from home.
Many suppliers don’t provide any instructions on looking after batteries, or people don’t read them. Our Battery Guide is available here . There are several important factors which determine how long your pack will last. Here are a few important rules which are helpful to remember:
* Always turn the battery/motor OFF when you are not using it
* Charge up your battery to 90% rather than 100% as often as possible
* Avoid running right down to totally empty
* Keep it out of extreme temperatures - over 30, or under 5 degrees
* If not using it for a while, store it at half charge. Push some charge into the battery every 3 months.
* When out riding, if your pack is so low that the controller cuts power, be sure to limp home with minimal or no assistance, rather than continuing to squeeze every last drop out of the pack.
Caring for your battery will maximise its life, and will save HUNDREDS of dollars, through looking after it properly. The peace of mind you’ll enjoy from a quality battery pack will help you sleep at night, especially when it’s on charge in your garage!
Download a printable PDF Frame Battery size template here.Get REV Electric Bike news first, exclusive promotions, and more delivered to your inbox.
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