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|ELECTRIC BICYCLE BATTERIES FOR SALE|
|My main aim is to have replacement batteries for e-bikes that I sell. They are mostly like this one. If your bike has a battery like this I may have a replacement battery for you. Some batteries look similar but have different input and output sockets, battery polarity and height. I intend for most new batteries to be LiFePO4. These can replace Li-ion batteries, but will need different charger and will have different height. In many cases the input and output sockets can be modified to match the need. Ask if there is a match for yours.|
|BATTERIES THAT FIT WITHIN THE FRAME (battery may differ a little from image)|
| 10Ah 36v Li-ion black case|
110mm x 75mm with 30mm rail for attaching to frame
input : 3 pin round
output : 4 slots at bottom, 380mm tall, 340mm to locking pin
$330 each + Charger $40
|REAR RACK BATTERIES|
|10Ah 36v Li-ion battery integrated with rack||10Ah 36v Li-ion battery integrated with rack|
These batteries are integrated with a sturdy double layer rack.
|INPUT AND OUTPUT SOCKETS|
|1 pin round input -||- 3 pin round input|
|3 bar output Socket ---- 3 slot output Socket||2 slot output Socket ---- 4 slot output Socket|
Note that output socket on left is not a legal socket -|
because a matching common household plug can be plugged in and connected to wall socket.
If you have battery with this socket you need to modify it, and the lead from it.
For the other 3 sockets a matching male connection and lead is available.
|24v20AH LiFePO4 E-Wheelchair Battery|
Dimensions : 128mm x 186mm x 165mm
$460 charger : $40
This is a little battery that packs a powerful punch
Avoid major inconveniences of flat car battery or flat phone for just $107
Emergency car starter with leads, and recharge leads for phones, cameras and pads
(For more information about electric bicycle batteries, and how to look after them E-Bike FAQ)
There are various kinds of "lithium ion" battery.
There is some confusion about just what batteries are "lithium ion" or "li-ion".
You can refer to wikipedia for more information but most commonly "li-ion" batteries are those with lithium, manganese and/or cobalt oxide (LiMnO2, LMN, LiMnCo)
and "LFP" batteries are those with Lithium Iron Phosphate, or LiFePO4 (although LFP is also a "lithium ion")
Most lithium batteries are "li-ion". "LFP" batteries are less common. This is not because "li-ion" batteries are better. They are not.
The battery makers in China have been making "Li-ion" batteries and don't want to change production lines for smaller quantity of "LFP" batteries. Similarly the bike assemblers do not want to change
LFP batteries are about 20% more expensive but have some worthwhile advantages over Li-ion batteries. You can read a lot about these batteries elsewhere but the main advantages are
* much longer life - twice, or more, recharges compared with "Li-ion"
* much greater stability and resistance to vibration, heat and shock
* very much less risk of combustion or fire if damaged
LFP batteries are exchangable for li-ion batteries but have slightly higher voltage and do need their different charger. Li-ion chargers have 42v charging voltage, and LFP chargers have 43.8v (If you are not sure of your battery type, see under side of charger. The small print will tell you the "Output Voltage") Both types of charger are available separately
There are different shapes and sizes of Lithium battery and batteries of similar shape and appearance can have different input and output sockets, and different fixing in place and locking. Common sockets are shown below. One other difference you may see is battery "polarity". Affects batteries with output slots at bottom. Up till now all my batteries had positive (+) on left. Now I am seeing some batteries with positive on right side. It is easy to change, by reversing the slots at bottom of the battery or the prongs on top of controller. The controller will not accept current going the wrong way.
The various types of battery are :
* Batteries that fit within the frame under the seat
These have various profiles. A metal case with 70mm by 110mm profile with round indent at front and sliding rail at rear is common. ("tall" - Chinese call these "silverfish") can have different height. Before replacing one of these Check the height of the locking pin.
Power outlet at top was common but now power outlet at bottom is common. It is usually a simple modification to replace the power outlet. The male socket can usually be added above controller box.
* Batteries that sit on or within a rack above back wheel
Most commonly the battery and rack are designed to fit one another. To keep a rack and replace battery you need to confirm the dimensions, the sliding plate, locking pin position. Otherwise you will need a battery and rack combination.
These can be added to most bikes, and are often part of a conversion kit
* Batteries that attach to seat post
These can be added to most bikes. You need room beneath the seat and a round seat post.
* Batteries that attach to the down tube ("bottle batteries") or sit within the "V" above pedal
These can be added to most "triangle" frames with straight tubes.
* Batteries that fit within the frame tube (some folding bikes)
* Batteries that fit within a wheel (attached to axle and inside a case)
Some e-bike brands have a proprietory shape, size, etc battery and only batteries made for those bikes can replace. Many smaller brands of e-bikes have batteries that are more generic that can be replaced, albeit with some minor alteration.
To replace a battery you should first ask the shop that sold the bike for a replacement cost, and whether one is available. If not you will have to look for one, or a similar one that may need a minor modification. Of course there are many suppliers on E-Bay, but try and see if they have a shop with stock in Australia (or your country). Beware that many of them will just pass on your order to Hong Kong or China. In which case, you may as well import one directly yourself.
Some suppliers in China that I know will send retail (one off) batteries are www.goldenmotor.com and www.leafmotor.com
If you need to replace an SLA battery first consider getting a Li-ion battery and adapting that to fit.
36 volt Li-ion or LFP for 36 volt SLA (etc). The voltages are very similar and motor will work the same,
but do get a new charger with the new battery.
The LFP battery will be much smaller and have different fixing but in many cases it can be done.
It would be easier to adapt one with the same output socket, but the 3 pin output socket will be harder to find,
because that socket on a battery is an illegal fitting.
The shop that originally sold the bike may have a complete battery case and batteries. Quite likely they will not have one. If you prefer to keep using the SLA battery then keep the case because it fits and locks in place. Take the 2 halves apart (screws at each corner) and take out the 2,3 or 4 12v batteries inside. Note how key lock and fuse (if there is one) are connected. Cut the last connecting wires where they join the battery terminal. (not the ones connecting battery to battery). Replace with matching new 12v batteries (available where car batteries are sold) and connect up wiring as the battery was before by soldering. Make sure the solder on the tabs is solidly joined.