This tried and true Lithium-ion battery is lightweight and trouble free. Sold as a complete solution, it's a 36V 10Ah battery complete with automatic charger and bag for mounting on the rear rack.

What it is:

• It is a 36 volt battery pack (42V when fully charged), compatible with most electric bikes and kits on the market
• It holds 10 amp hours of charge. That means it can supply 10 amps for one hour
• This is about 360 watt hours. It could run a 100 watt light bulb for 3.6 hours.
• It can run a typical electric bike from 15-30 miles. It all depends on how much you pedal, and how big your hills are. If you use it only on hills, you're likely to get even more mileage out of it.
• This pack weighs 10 pounds
• It uses Lithium ion (manganeese) cells which are a stable chemistry. This chemistry is becoming the battery of choice for ebikes around the world
• The battery is completely enclosed in a hard plastic case with an on/off switch. This rigid case protects the battery and the on/off switch guards against accidents when the bike is parked.
• It comes with an automatic charger, Anderson Powerpole 30 amp discharge terminals and an XLR charging port
• Includes a cordura bag designed to mount on the side of a rear rack.
• It can be used with 20amp controllers only (C rating is 2C)
• Average life expectancy 500 cycles or 3 years.

This Lithium-ion battery is tried and true for trouble free operation. Made by Phylion, the world's largest battery producer, lithium-ion is fast becoming the chemistry of choice for ebike manufacturers in the US and Europe. Lightweight and reliable, this battery will give you years of happy use, day in and day out.

Not only do you get a good battery with this option, you get a complete battery solution including charger and mounting system. The charger is fully automatic (made by Hi-Power) so it turns off when completed charging to prevent overcharging. It has a built-in fan to keep the charger cool and an on/off switch.

Also included is a bag for mounting the battery to your rear rack. The bag clips onto the rack and hangs on the side, leaving the top free for your other items. Convenient openings for the switch, charging port and wiring, make this a nice solution. The battery case also has mounting rails which can be slid directly onto a Topeak MTX rack. In this case, the battery just slides onto the top of the rack for a secure solution.

For a lightweight lithium battery at a great price, order this battery today.

The pack comes with a 1 year warranty against manufacturing defects. However, if you have trouble after that (and we rarely see this) we will gladly do a free discharge test on the battery to determine it's capacity. A discharge test involves hooking the battery up to a computer and discharging it at a slow rate, and then graphing out the voltage and amp hours as we go. This will tell exactly how many amp hours the pack is providing and if there is a bad cell, it often will show up under these conditions. We also offer repair services and replacement of cells at a reasonable price.

Is this battery big enough?

This is probably one of the most common questions we get. There are 2 main considerations for the capacity of a battery. One is the range you want to travel. A battery with a higher capacity will take you further than one with lower capacity, but it will also cost more, be heavier and bulkier. So ideally you want to match the battery to your needs without going overkill.

Here is a rule of thumb for calculating your range. First calculate the total available watts for the battery by multiplying the voltage times the amp hours. So 36V 10Ah = 360 watts. Then divide the total watts by your motor's consumption. Now this efficiency rating is sometimes hard to come by, but for a typical 36V geared motor, we have found useage to range from 10-20 watt hours per mile, depending on how much you pedal, how many hills you have, how windy it is that day, how much weight you are hauling, etc. So 360 watts divided by 10 watt hours per mile (a conservative usage of the electric) will give you 36 miles of range. If you use the electric more and pedal less, then 360 / 20 = 18 miles of range. So this battery would provide about 18-36 miles of range. If you have a direct drive motor (such as Bionx, Nine Continent, or Crystalyte) your efficiency, and thus your range, will be higher.

Now, a 48V battery will have a higher capacity than a 36V battery, however, it also has more power and speed available, so typically the amount of watts used per mile is higher with a 48V battery unless the power is limited. When we have all that power at our fingertips, it is just human nature not to use it a little more!

The second consideration when choosing a battery capacity is what type of amperage your controller is using and what rating your battery has to supply this amperage. In addition to voltage and amp hours, batteries have a 3rd rating, called the C rating, which is an indication of the amperage your battery can provide. Multiply the C rating times the Amp Hour rating to get the MAX amperage the battery can provide (e.g. for 36V 10Ah battery with a 3C rating, the max amperage is 3 * 10 = 30 amps). This is the maximum the battery can provide. Batteries will be much happier and longer lasting if you keep them below their max most of the time. Now compare this number with the amperage rating on your controller (eg. 20amp, 30amp, 35amp, etc). This rating is how much amperage your controller is capable of drawing. If the controller is drawing more than the battery can supply, you could do damage to the battery. To get around this you can

• 1. get a larger capacity (amp hour) battery,
• 2. get a battery with a higher C rating, or
• 3. limit the amps your controller draws using a cycle analyst.

Note that this calculation is independent of the voltage rating.