48v 16Ah LiIon BATTERY PACK

  • Shipping Weight: 4.5kilos
  • 2 Units in Stock

$650.00

 

EXTREME POWER NMC Lithium Ion 48v 16Ah battery pack

 

Our new LiIon battery packs are being built from 32mm cylindrical cells. We are using 32650 cells, these are Lithium NMC 3.7v 8Ah capacity and 5c discharge rate. I have been told Mercedes is using the same cells in their EV packs! (hard to find out if this is true of course!) These cells are rated at 40A discharge, two in parallel gets us 80A discharge rating. Perfect for the 40-50A load from our 2000w mid drive kit as you never want to load your cells up more than around 50% of their rating if possible.

 

Reason I am trying 32mm cells is they are much easier to build into packs, with only 2 cells in parallel it is easier to find a bad one and easier to replace it if needed. 18650 cells have come a long way in the last 5-10 years and you can get some amazing high power versions (not cheap though) but you still need 5-6 cells in parallel to get the capacity high enough for a bike. 5c discharge means 2500-3000mah per cell maximum, larger capacity cells don’t have the same discharge ratings so a 4000mah cell might only be 2c, this means 8A max, 5 of them in parallel gets you a 20Ah pack with a max rating of 40A discharge, its just not enough for high power bikes like ours.

 

We are building the packs with a quality BMS board that features balancing circuit, over charge and over discharge protection, a 40A constant output stage that will take up to 60A short term and has a 100A short circuit protection built in.

 

Our first shipment is a semi triangle, approx 200mm across the top and 200mm down the back, it fits our LUNA triangle bag. We use AMASS XT90s antispark plugs for main connection, you charge through the same plug as the BMS is shared port design. Pack weight is 4.4kg.

 

NOTE: We plan on building these packs here in Australia in the coming months, and will be building them as a rectangular pack that will be approx 230mm long, 130mm wide, 70mm thick.

 

 

 

ABOUT OUR BATTERIES

 

NMC LiIon PACKS (Lithium Nickel Manganese Cobalt Oxide)

One of the most successful Li-ion systems is a cathode combination of nickel-manganese-cobalt (NMC). Similar to Li-manganese, these systems can be tailored to serve as Energy Cells or Power Cells. For example, NMC in an 18650 cell for moderate load condition has a capacity of about 2,800mAh and can deliver 4A to 5A; NMC in the same cell optimized for specific power has a capacity of only about 2,000mAh but delivers a continuous discharge current of 20A. A silicon-based anode will go to 4,000mAh and higher but at reduced loading capability and shorter cycle life. Silicon added to graphite has the drawback that the anode grows and shrinks with charge and discharge, making the cell mechanically unstable.


The secret of NMC lies in combining nickel and manganese. An analogy of this is table salt in which the main ingredients, sodium and chloride, are toxic on their own but mixing them serves as seasoning salt and food preserver. Nickel is known for its high specific energy but poor stability; manganese has the benefit of forming a spinal structure to achieve low internal resistance but offers a low specific energy. Combining the metals enhances each other strengths.


NMC is the battery of choice for power tools, e-bikes and other electric power trains. The cathode combination is typically one-third nickel, one-third manganese and one-third cobalt, also known as
1-1-1. This offers a unique blend that also lowers the raw material cost due to reduced cobalt content. Another successful combination is NCM with 5 parts nickel, 3 parts cobalt and 2 parts manganese (5-3-2). Other combinations using various amounts of cathode materials are possible.


Battery manufacturers move away from cobalt systems toward nickel cathodes because of the high cost of cobalt. Nickel-based systems have higher energy density, lower cost, and longer cycle life than the cobalt-based cells but they have a slightly lower voltage.


 

NOTE: Using a quality charger and storing batteries safely in a steel tool box are necessary habits to get in to with Lithium batteries and something we expect our customers to do. We do not warranty overcharged batteries that are charged with 3rd party chargers.

NEVER Charge batteries inside your house! We say this to every customer, it’s in our battery instruction notes, and it NEEDS TO BE FOLLOWED. We will not be held responsible for you damaging your property by charging or storing these batteries inside the house! Charge outside under cover, or in the garage on a non flammable surface away from everything!

 

NOTE: ALL Lithium cells start to degrade as soon as they are manufactured, they have a finite shelf life, storing them correctly at 50-60% capacity increases their lifespan a lot. It is this reason that claims from sellers of thousands of cycles is completely pointless, as most of these batteries will fail due to age and not cycles!!

 

Following strict guidelines will get the most life from your batteries, being careless with how you use and store them will result in shorter lifespan. Storing them for weeks on end fully charged degrades the cells over time, we suggest charging the battery back to 48v before storing it, 54.6v is fully charged, 48v is nominal and a good voltage for long term storage. Get yourself a cheap $15 multimeter from Jaycar so that you can measure the voltage of your battery pack via the XT90 plug, its cheap and easy to do.

 

 

 

TERMS & CONDITIONS:

Riding an Electric bicycle can be a dangerous activity, OZ-eBikes cannot be held responsible for accidents or injury caused by your use of these products. Our warranty responsibility is limited to the products supplied only, and warranty is provided for the supplied products only if they are used as intended. Any modifications to the equipment, use of incorrect batteries or chargers etc will void the warranty.

 

Lithium batteries are dangerous and must be handled with care; if they are dropped and there is visible damage or deformation of the case you should seek expert advice before continuing to use the battery. Lithium batteries are treated as experimental power supplies, the technology is new and requires education and care in handling, if unsure you need to ask advice and learn correct procedures on handling and storing of Lithium batteries.

 

We highly recommend purchasing a small $11.00 steel toolbox from Bunnings to store your batteries in when not in use. Batteries MUST be stored and charged outside the house. By purchasing from us you agree to accept full responsibility for the safe handling and usage of our Lithium Batteries. You agree OzEbikes and its partners cannot be held liable for any accident, fire, loss of property or possessions resulting from a lithium battery or charger failure, our instructions on handling and storing are very clear and are the ultimate responsibility of the purchaser.

 

Batteries must be charged with a specified LiPo charger, we are not responsible for any issues that arise if you use a charger other than the ones we recommend. Our chargers are computer controlled and have advanced settings to ensure the battery cannot be left charging continuously, while the chargers automatically shut off when the battery is fully charged you should NEVER leave a battery charging alone, electronics can fail, our responsibility extends only to replacement of the charger if proven faulty.

 

OZ-EBIKES checks and records the battery pack voltage for every Lithium battery pack before we send them out. OZ-EBIKES then warrantees all packs to have proper assembly and cell voltage at time of purchase. In the event that a customer finds defects in materials or assembly workmanship when the goods are received but unused, OZ-EBIKES will replace such packs within Australia after inspection if they are deemed to be faulty.

OZ-EBIKES does not offer a general warranty for battery packs which have already been charged and discharged, or for which claims are made more than one week after receipt of said battery packs by the customer. Because the majority of Lithium Battery problems occur after initial use and are due to over charge/discharge of the packs or shorted/damaged wiring, it is in most cases difficult to determine the cause of failure, and requires inspection by the manufacturer.

 

For packs that have been used and which the customer believes are defective, OZ-EBIKES & their manufacturer have agreed to have these inspected at the factory within 30 days of purchase, and replaced if defects are found. In the event that the pack is found not defective or has been damaged by misuse, the pack may be returned to the customer if desired, at the customer's expense.

 

There is no warranty, expressed or implied, by the manufacturer, distributors or retailers with respect to capacity, life in cycles, storage or discharge characteristics available.

 

By purchasing any complete kit, battery pack or individual parts from us you agree to our terms and conditions.

 
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This product was added to our catalog on Thursday 25 June, 2020.

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