Batteries

The battery pack in your e-scooter or e-bike contains the “fuel” required by the electric motor. The majority of e-scooters and e-bikes use a lithium-ion battery. This type of battery has no memory effect, don’t self-discharge and have high capacity, so they're perfect for electric scooters.

The battery pack is made up of individual cells, not too dissimilar to what a typical battery looks like. To increase the range of your e-bike or scooter the battery capacity needs to be increased by adding cells to the battery pack. This however increases the cost, size and weight of the battery pack as well as the charging time.

Battery capacity is measured in watt hours (Wh), this is easily calculated by multiplying the battery’s voltage (V) by it’s amp hours (Ah).

Wh = V x Ah

A battery's Wh rating can be used to compare batteries with different Voltages and different charge capacity (Ah) ratings. But don't forget to also compare the weight of the battery and cost. The battery with the highest voltage (V) rating or capacity (Ah) isn't always the "best" - there are multiple factors that need to be taken into consideration.

Batteries use a battery management system (BMS) in order to make sure the battery is charged and discharged safely and to allow the power to be delivered as efficiently as possible.

The cells in electric scooter and e-bike batteries are manufactured by only a few Japanese and Chinese companies. You’ll now find Chinese battery technology in the latest electric vehicles including Tesla cars.

For electric scooters batteries are only one of the components to check when comparing products. Another major factor in an electric scooter’s performance and range is the motor. For a guide on electric scooter motors click here. For e-bikes the current UK law for assisted e-bikes limits motor power to 250W.

Battery Maintenance

Your e-scooter or e-bike is supplied with a lithium-ion battery (li-ion). These batteries have a high energy density allowing a lot of energy to be stored compared to the size of the battery pack. The batteries also have no memory effect, a feature found in other types of batteries that results in the charge capacity being reduced over time. Lithium-ion batteries also don’t self-discharge compared to other battery types.

Here are some simple tips to help you look after your battery.

● Don’t drain it completely: e-scooter & e-bike batteries are designed differently to your mobile phone battery.

● Keep topped up and every 5-10 charge cycles drain completely. Only use the official, supplied charger. If required we can supply replacement or additional chargers. Not all chargers are the same, even if they look identical.

● Try not to charge immediately after using your e-bike or scooter. Let the battery cool down for 10-15 minutes before charging.

● If possible charge your battery inside (above 10°C) as batteries don’t like the cold. Your charger will have a green light when battery is fully charged. Your battery will charge up to 75% fairly quickly while the final 25% will take longer.

● If storing your scooter or e-bike for extended periods, i.e. over winter then don’t forget to top it up every few weeks.

Voltage Sag

Electric scooter and electric bike batteries will suffer from "voltage sag" to some extent.

Voltage sag is caused by temperature, the resistance in the system and the chemistry make-up of lithium-ion batteries.

While not a cause for concern it's something to be aware of as voltage sag will produce a non-linear voltage output.

When a load is applied to the battery the battery voltage will drop, this can lead to incorrectly estimating the remaining battery capacity. However once the load has been removed the voltage goes back up to its correct value.

Voltage sag will also take place during long periods of discharge such as when on a long ride or when the demands on the battery are greater such as when going uphill. This explains why voltage sag is more noticeable towards the end of a long ride.

If the battery is rested for a while then a more accurate reading is provided.

Manufacturer's range figures

range

All range figures quoted are as supplied by the manufacturers. These will be in test conditions and with ideal settings, so a warm day, a dry road, lightweight rider, no inclines, cruise control on, lowest speed setting. 

The figures you will achieve in reality will vary. Most people will ride with undulations, most rides will involve stopping and starting and accelerating from a stop, 99% or riders will also switch to the fastest speed setting and never use the lower speed settings. 

Based on actual tests by reviewers and industry experts a "real life" range figure can be estimated at around 50-70% of the manufacturer's figures.

When comparing scooters don't make your buying decision based on range. If two scooters have the same motor and same battery then even if different brands the range is going to be similar, (despite what the manufacture's figures claim).

If comparing scooters and one has a larger Ah battery rating and the motor is the same then the scooter with a larger Ah rating should have a greater range.