September 11, 201213 yr is it possible to use a secondary battery as an emergency power supply or just to extend range . I am thinking that it would need to be mounted on my rear rack, possibly under panniers. But how would it connect when required. I have freego eagle which has the battery pack mounted behind the seat post. gray
September 11, 201213 yr You need to find your way to your controller compartment under the battery. In there are the thick red and black wires. you need too solder on two more thick red and black wires long enough to reach your rack. Drill a hole if you need to to get them out of the compartment, and then solder on a suitablle connector for the battery. Anderson connectors will be best because they don't have exposed pins, and this connector will be live when your other battery is on. It would be safest to have the additional battery at the same voltage. Then you can use them at the same time. If you want to experiment with a higher voltage battery, you have to make sure that you have your normal one switched off when you connect the new one otherwise severe damage will occur. Likewise, you mustn't leave a flat battery switched on when you connect a charged one. A safer idea would be to bring your existing battery wires from the controller compartment up to the rack with a female connector. Put a female connector on your new battery and then run a male connector back to your controller, so that you can connect either, and/or make a "Y"connector to connect them in parallel (if both charged and same voltage).
September 11, 201213 yr Author thanks d8veh. That sounds a bit complicated to me. Think I will just have to take it one step at a time gray
September 11, 201213 yr It shouldn't be difficult at all.Effectively all you do is lengthen the wires from your battery and controller so that you can bring the connector up to the rack. Then put the same connector on your new battery, and them you can choose which you join to the controller. Should take about 15 mins max.
September 12, 201213 yr Perhaps the easiest option, which I do, is to cycle with a spare battery and swap them over when the first one runs out...........?
September 12, 201213 yr Perhaps the easiest option, which I do, is to cycle with a spare battery and swap them over when the first one runs out...........? Ahh the Russian solution
September 12, 201213 yr Jeanette, That's what I intended to do, but price of second battery put me off the idea.......Del.
September 12, 201213 yr Perhaps the easiest option, which I do, is to cycle with a spare battery and swap them over when the first one runs out...........? Yes indeed, second battery in the panniers, 2 minutes to change over and back on the road.
September 12, 201213 yr GaRRy, Russian solution ??........Del. Old story Yanks spend a fortune on designing a pen that can be used in space as normal ones no good due to lack of gravity. Russian solution - use a pencil. sadly in reality a urban legend but makes the point. also know as KISS (Keep It Simple Stupid)
September 12, 201213 yr Old story Yanks spend a fortune on designing a pen that can be used in space as normal ones no good due to lack of gravity. Russian solution - use a pencil. sadly in reality a urban legend but makes the point. also know as KISS (Keep It Simple Stupid) The Americans spent a fortune designing neat little electrical control systems for their attitude and reaction thrusters on the Apollo and subsequent craft. One of the first American astronauts to visit the Russian Mir station was intrigued to see "The Russian Solution" - lever valves. KISS, indeed.
September 12, 201213 yr Something similar... but... is it possible to use a secondary battery as an emergency power supply or just to extend range . I am thinking that it would need to be mounted on my rear rack, possibly under panniers. But how would it connect when required. I have freego eagle which has the battery pack mounted behind the seat post. gray I mounted the second battery on the top of the rack - photos here http://www.pedelecs.co.uk/forum/electric-bicycles/11931-what-would-happen-if-48v-alien-aurora-3.html The main advantage - it is still under the panniers (hidden and protected) and I can use either battery without any hassles. The main disadvantage - the weight distribution is scary! I just spliced into the wires that came from the other battery and as mine are 2 different voltages, I must make sure they are not on at the same time.
September 13, 201213 yr The main advantage - it is still under the panniers (hidden and protected) and I can use either battery without any hassles. If I leave the bike unattended then I put my spare battery in the lockable box I have on the back of the bike as I'm conscious of the high cost of the battery !
September 13, 201213 yr Author think I may look to get a second battery that I can just put in the pannier and switch when required. I am not very technical and despite the helpful posts on here, I know that if I started messing about with wires etc, I would end up in a mess. Next question is , Does a second battery have to be exactly the same, ie from original supplier (Freego) or are there cheaper alternatives. Thanks for your replies gray
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