I think you may have missed my point. The problem with mismatched packs isn't just with charging, it's also with discharging. That little 5th battery is going to drain first and then act kind of as a resistor in the circuit, pulling amps from the other batteries and converting some of them to heat. It will get ruined pretty fast and the other batteries will suffer as well, if more slowly. All you really need to do to solve that problem cheaply is get one more 20AH battery to match the other four, then continue to charge them in two "sets." I think you'll find the bike/scooter will perform much better with 5 matched batteries. I'm no expert, but I've been following power-assisted bicycle forums for quite a while, as well as EV scooters forums.
Well, I now have 5 identical brand-new batteries, all 22AH, as well as a 60-volt charger (5 amps). I want to charge all the batteries together, on the bike.
So I'm building a power cord with 14-gauge wire because 18-gauge looks too weak. I'm guessing it has to handle 5 amps from the charger but 10+ amps while running since I did the shunt mod. The positive wire from the battery pack (4 batteries wired in parallel) will run to the 5th battery and then to a junction from the charge port, the black wire from the battery pack will run straight to this junction; and from there both black and red will run to the controller; does this sound right?
I don't want to cook another set of batteries! Becoming a chef of lead-acid cuisine is not my goal. A 60-volt bike that has some torque and is easy to recharge is what I'm after.
Somnolent soul in a silicon wasteland
My 60volt system has gone haywire. I used the scooter in the AM yesterday, put it on charge like I normally do and went about my business. I noticed that the charger was till running (could hear the fan) as I closed up for the evening. This morning the smell was horrific. I quickly (holding my breath) opened the garage door and started airing out the place. I unplugged the scooter and wheeled it out side noting that it was very hot. I used the kick stand to support it on the driveway and electrolite poured out of the battery box.:-(
I have washed stuff down and opened the box to find that the batteries are completely melted together and my extra battery (brand new) also has a problem. I checked the voltage on all the batteries and they were all up in the 13 volt range so.....
That seems to mean that the problem was not with the batteries. If it was a battery, then I would expect one to be shorted out and the charger would be working into a 48 volt load not a 60volt load. so it must be the charger.
The charger is a model BC60/3-5A with no name brand on it.
1. any of you have a cheap place for batteries
2. how about a charger. Maybe I should design a safety cutout seperate box with voltage and current monitoring.
I am going to have to replace both - Bummers.
The X-Treme 60 volt charger I use with my XM-3000 is only about $150 and I've had zero problems with it.
That sounds exactly like my experience (with the stock 48v charger from x-treme). The charger is supposed to shut off automatically once the batteries are charged, but if it's faulty then it keeps charging and cooks your batteries. I bought a heavy-duty appliance timer along with a new charger, because I'll never again trust a charger to shut down when it should.
I got five UB12220 batteries as replacements (12-volts, 22 amp-hours), found them online and they shipped pretty quick. Still gotta find the time to rebuild the bike, though.
It turns out that the 12220 batteries are not available due to China's not shipping them until September. So I went with 12180 only 18Ah but less cost $34 + shipping and they are lighter in weight. Still waiting for a controller I ordered for $89 in that it's suppost to be a 1:1 replacemnt. Batteries are here and I just finished a neat wiring job in the battery case - now for the bike itself. Going to try for a bigger guage wire and a bigger fuse holder. Maybe even a current shunt to measure the current.
Great instructable, now I just bought a 48v 800w scooter and I want more distance what would be the best thing to do? Add a battery12v and if so someone told me I cold damage the controler, I am not savy on this matter for the moment, but am working on it. They also told me I could fry my controller if I attemped such a stunt??? my moto is a TRD039z 20011 48v 800w thanks in advance for your suggestions Take care
My 48v scoot is now 60v with 5 12v 18ah bats. And I get 31mph without shunt mod. Shunt is next. I was going to 72v but not now thanks for the info.
I have been given a Velotq SHO-GT with no batteries. I have ordered batteries. Can anyone send me a photo of how the wiring should be from battery to battery, etc. Also, does anyone know of any good source material for maintaining the Veloteq? I have downloaded the Owner's Manual, but it is a bit skimpy on detail.
Thanks for any help or suggestions you might have about this bike.
:-) David (-:
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Communal learning about moving our butts around town without burning fossil fuels.