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The battery is the most important and expensive component of an electric bicycle, you have to pay the money if you want a good one. The best manufacturers of lithium ion batteries for ebikes are PANASONIC, SAMSUNG and BOSCH. All of BOSCH's batteries are integrated systems and cannot be used with kits. We stock a good range of advanced lithium ion batteries using PANASONIC cells or SAMSUNG cells. These have the highest power to weight ratio of all commercial lithium ion batteries. All batteries have an internal protective battery management system (BMS). Your choice of battery should be made based on style preferences and range required. A battery with a greater capacity will give a greater riding range. Capacity is measured in Amp hours (Ah) or Watt hours (Wh). Typically, 36V batteries are used for motor powers between 200W - 500W and 48V batteries are used for 1000W motors. Tubular batteries or the Black Diamond batteries result in improved handling as they are mounted within the frame and offer a better centre of gravity. Rack batteries are better suited for step through ladies bicycles or for longer riding range. There is more information on batteries and best charging practice at the bottom of this page.

36V 9Ah TUBE BATTERY
36V 9Ah tube battery

Voltage: 36V

Capacity: 9Ah, 324 Wh

Size (cm): 32 (l) x 9 (d)

Weight: 2.8 kg

Cell manufacturer: PANASONIC

Battery: $530

Charger: $95

Delivery: $35

Notes: Comes with lockable holder to secure the battery to the bike frame and cable to run to motor controller. Click here to see an installation video using this battery.

 

36V 11Ah RACK BATTERY
36V 11Ah rack battery

Voltage: 36V

Capacity: 11Ah, 396 Wh

Size (cm): 34 x 15 x 7

Weight: 3.6 kg

Cell manufacturer: PANASONIC

Battery: $580

Charger: $95

Delivery: $35

Notes: Comes with a custom lockable double layered rack and a controller box. The battery slides into the rack to connect to the controller box. Click here to see an installation video using this battery.

36V 11.6Ah SUPER TUBE BATTERY
Super Tube Battery

Voltage: 36V

Capacity: 11.6Ah, 417 Wh

Size (cm): 32 (l) x 9 (d)

Weight: 3.2 kg

Cell manufacturer: PANASONIC

Battery: $630

Charger: $95

Delivery: $35

Notes: Comes with lockable holder to secure the battery to the bike frame and cable to run to motor controller. Click here to see an installation video using this battery.

 

36V 14.5Ah BLACK DIAMOND BATTERY
36v black diamond battery

Voltage: 36V

Capacity: 14.5Ah, 522 Wh

Size (cm): Click here

Weight: 4.2 kg

Cell manufacturer: SAMSUNG

Battery: $775

Charger: $95

Delivery: $35

Notes: Notes: This is a long range 36V battery option that is designed to fit within the frame of the bicycle to offer a great balance of handling and range. It can be fixed to the water bottle mounts. It's great for any motor option of between 200W to 500W.

36V 16Ah LONG RANGE RACK BATTERY
long range rack battery

Voltage: 36V

Capacity: 16Ah, 576 Wh

Size (cm): 34 x 15 x 7

Weight: 4.8 kg

Cell manufacturer: PANASONIC

Battery: $775

Charger: $95

Delivery: $35

Notes: Comes with a custom lockable double layered rack and a controller box. The battery slides into the rack to connect to the controller box. Click here to see an installation video using this battery.

36V 9Ah SEAT POLE BATTERY
frog samsung 36V lithium ion battery

Voltage: 36V

Capacity: 9Ah, 324 Wh

Size (cm): 22 (l) x 8 (h) x 15 (w)

Weight: 2.8 kg

Cell manufacturer: SAMSUNG

Battery: $530

Charger: $95

Delivery: $35

Notes: This battery is designed to attach to the seat pole of a bicycle. It is useful for folding bikes and tricycles but can be used on many other bicycles too if you like the style. The controller sits in the box underneath the battery. You need approximately 15cm of seat tube free to allow space for the battery. It is easily removed with a key lock. Click here to see a picture showing this battery mounted on a bicycle.

48V 11.6Ah BLACK DIAMOND BATTERY
48V black diamond battery

Voltage: 48V

Capacity: 11.6Ah, 557 Wh

Size (cm): Click here

Weight: 4.2 kg

Cell manufacturer: SAMSUNG

Battery: $775

Charger: $95

Delivery: $35

Notes: This is the best 48V battery suited to running high power electric bikes that we've been able to find after years of testing. It sits within the frame of the bike and can be fixed to the water bottle mounts. It's great for handling and power. Between 25-40km range can be expected using this battery with a 1000W kit.

48V 10Ah RACK BATTERY
48V 10Ah rack battery

Voltage: 48V

Capacity: 10Ah, 480 Wh

Size (cm): 35 x 15 x 9

Weight: 5.8 kg

Battery: $775

Charger: $95

Delivery: $35

Notes: Comes with a custom lockable double layered rack and cable to connect to controller.

 

The best charging practices are to charge often and don't regularly run it flat. Once you know your range, aim to keep within 20% of that range on a regular basis. The charger will turn off once the battery is fully charged. It's good practice to remove the charger once it is fully charged because you still have a live circuit. Be sure to always turn the battery switch off when you are not using it, a small amount of current will drain into the controller otherwise and the battery will go flat within a few weeks. If you are going away for a long time then give the battery a full charge and remove the battery from the rack or unscrew the cable at the bottom if it is a tube style. It will be ok for around 3 months if you do this. If you run your battery flat then you should charge it up as soon as possible. If you leave it in a flat condition for a long time then you will likely damage it beyond repair.

We don't want to worry you but you should know that lithium ion batteries can be dangerous. Watch this video if you want to see what can happen if they get mis-treated. You should treat your battery with the same precaution as you would treat a bottle of petrol. They should not be exposed to heat or physical damage. You should charge your battery in a place where it can't get damaged and if there is an accident it won't be fatal. Ie, don't charge your battery next to a sleeping baby. There are many circumstances around the world of lithium ion batteries catching fire. If they do, there is very little you can do about it as they are extremely hard to extinguish, put out lots of acrid smoke and burn extremely hot. The best thing to do if there is a fire is douse it continuously with water if it's safe to do so - perhaps have your charging location in reach of your garden hose. The risk of fire is extremely small if you don't do anything silly or have an accident but you should be aware of the potential risk. We only use batteries from top manufacturers and they are all tested at the battery factory and at our warehouse. We also only use chargers specifically designed for the batteries and with Australian electrical certification. Don't use any old charger for them, you need to get the correct one. It is wise to first charge and even turn on the battery outdoors.

The main choices available for powering electric bicycles are lead acid batteries and lithium ion batteries. Lithium ion batteries are far superior to lead acid batteries and are clearly the ideal choice for use with an electric bike. There is a range of chemistry used in lithium ion batteries, common ones include lithium cobalt oxide, lithium iron phosphate, lithium manganese and lithium nickel manganese cobalt oxide. Each type has its own advantages and disadvantages and each manufacturer has trade secrets as to the exact composition of each metal in its slurry. In practice, we find that the lifetime of all lithium ion chemistry types is very similar under real riding conditions and its the quality control of the manufacturer that gives the greatest safety and quality of the battery. Warranty is also important as nearly all electric bicycle failures are due to the battery. In nearly all cases, any fault will appear within 1-2 weeks. Once through this "teething" stage then your battery is unlikely to fail for a few years

Lithium ion batteries last about 3 times as long as lead acid batteries and weigh about three times less - approximately 4kg (Li ion) vs 12kg (lead acid) for 36V 10ah. There is simply no comparison if you are looking for high performance. The cost is still very high for excellent quality lithium ion battery packs for electric bicycles but the enhanced lifespan compensates for this cost difference. It is important to use a lithium ion battery designed for an electric bike as they have battery management systems (BMS) inside them. The BMS is a piece of circuitry that must be set appropriately to control the amount of current draw required by the motor and to limit excessive discharge capacity. The BMS is also important for balancing cell charge between the individual cells within the battery to maintain battery life over time. For performance reviews of the batteries on offer please read through some of the testimonials.

Sealed lead acid batteries are also not a bad option if that is what you have handy or are budget limited. They have proven through the test of time and handle the current draw of electric bicycle motors well. Absorbent glass mat (AGM) batteries are commonly used lead acid batteries for electric vehicles, they use either gel or absorbant glass mat fibres to hold the electrolyte. They have a higher energy density than typical car batteries and can be inverted without spilling acid, they cope with higher temperatures and can be charged and discharged more rapidly. You should be able to get a set of sealed lead acid batteries from a local battery shop for between $130 - $250. If running a 36V motor, you will need to get three 12V batteries and hook them up in series (aim for about 12ah each battery). You will also need to get a 36V battery charger - send us an email if you need help in sourcing one as they can be difficult to come by.

Lead acid batteries suffer in comparison to lithium ion batteries on two important factors. Recharge times and weight. Lead acid batteries can be recharged approximately 200-250 times while high-end lithium ion batteries can be recharged about 500 - 800 times. Lead acid batteries are also about three times as heavy. We're sorry to those who would prefer to use lead acid batteries or purchase some for their old kit. We've opted to aim for high-end products and no longer stock them. The battery is the most expensive component of our kits, approximately three quarters of the cost.