e-Bike Battery Guide

Posted on By Emu Bikes,

The battery of any e-bike are an important gauge of the bikes overall performance. The two specifications that you should look at for are the battery’s Volts (v) and its Amp Hours (ah). These give you an indication of the overall power of the bike as well as the range.

But it is also important to consider bike weight, as this will directly affect both overall power and the distance the battery can reach on a single charge.

Voltage (v)

In the UK most e-bike’s use 36 volt batteries but it’s possible to also find 24 and 48 volt versions. Here at Emu, our bikes use special 36v Samsung (10.4Ah) and 36v Panasonic (11.6Ah and 13.6Ah) ebike batteries.

Volts are the amount of potential power the battery is capable storing and then transferring to the motor. Our e-bike’s 36v battery produces 250 watts of power for the motor, although the wattage output can vary in other 36v battery models.

36v batteries are most common in Britain due to the Electrically Assisted Pedal Cycles (EAPCs) law which states that motors must have a maximum wattage of 250 and top speeds capped at 15.5mph / 25km/h. This makes 36v batteries a good choice for UK manufacturers as they provide a good balance of cost and performance.

Amp Hours (Ah)

Amp Hours indicates the range the battery is capable of achieving from a single charge, so the larger the AH, the further battery can go. However, battery range is largely dependent on other factors including riding style, route (hilly roads, etc.), battery voltage, the bike’s motor and the weight of the bike.

As standard our e-bikes come with a 10.4Ah battery capable of reaching up to 80 km / 50 miles from a six to eight hour charge. We also offer an 11.6Ah battery which is capable of 90 km / 56 miles and a 13.6Ah which can reach 104km / 65 miles.

Bike Weight

The more weight on the bike then the harder the battery has to work, affecting both the power output as well as the range you are capable of achieving from a single charge. This is another reason why many electric bike manufactures prefer 36v batteries as they are lighter than 48v versions. Our 36v batteries weighs 2.4kg while a typical 48v battery weighs around 3.6kg.

This weight versus power pay off makes 36v batteries more practical for everyday commuting as well as leisurely use.

Here at Emu, both our step-through and crossbar electric bikes weigh 23kg, which makes them among the lightest in their class.

In our article on e-bike battery care we also highlight the importance of keeping your tyres fully inflated as a drop in pressure will also affect performance. Under-inflated tyres increase drag and force the motor and battery to work harder, decreasing the range.

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