Small lightweight alternative to an acid motorbike battery?

[binge]

I'm having voltage regulation issues with the Chaly.

With the small Reg/Rec fitted, it will run fine, but once I put my lights on, the horn worn work properly unless I rev the engine.



With the big Reg/Rec fitted, it over charges and pops bulbs.



So either way, I NEED a battery.


Now I'm trying to work out the best solution.


Could I:


a) Run the small reg/rec, with a 12v lithium battery pack?
This will provide the umph to use the horn etc at tick over, but will also charge properly when I'm riding along, with higher revs etc.


b) Run the bigger rec/rec, and wire a battery eliminator in, instead of the battery, to soak up the excess charge.



Which of the above (If any) are possible?

Will a Li battery work? Or will it just blow up under the alternator charge of 13.5v?



Any help MUCH appreciated.




Ben

[Pete.]

Fire panel battery. I have a tiny 12v one here but I have no idea what condition it's in. I'll put it on charge for a while and if it picks up you can have it.
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a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good

[promufa]

Lithium battery should work fine. You can easily charge them up to 14.4V without problems afaik. The only issue is they are more likely to die if they are left to drain completely.

EDIT: the automotive specific lithium batteries with high CCA. Not the regular (cell phone type) lithium batteries
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'02 Triumph Speed Four

[binge]

The only reason I ask, is because the Chaly is 6v as standard.
You can get very small 6v bike batteries, but cant find small 12v ones.

I've not got an airbox, so I have my complete wiring loom, reg/rec, flasher unit etc etc, under the tank, in place of the airbox.
I have a nice bit of room under the seat now, but still not quite enough for a 12v bike battery.

[Robby]

There was a thread a while ago about doing a similar thing with an enfield, and the solution was to use a capacitor.

If you find the thread, put a link up, because I'm planning a similar thing with one of my 250s.

[promufa]

Yeah, I ve been reading the chaly project thread. I think I sent you a link on there for some lithium batteries. They are a lot smaller than the standard lead-acid. Think they have the dimensions on the ebay ad. Have a look if they would fit would be

Or as said, a large capacitor should work as well.. you only need the battery to smoothen out the reg/rec output as you ll be using the kick start. You could maybe even cook a capacitor with a decent voltage regulating transistor-type thingy to kep it steady at 13.2V or so
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'02 Triumph Speed Four

[binge]

The original reg/rec (Small one) NEEDS a battery, as the lights are all too dim. At tickover there is only 11v coming out of it.
But as soon as I blip the throttle, it goes up to a steady 13 or so.
But obviously at traffic lights, or low RPM, with the headlight on, nothing else works.
So I need something to just assist it at low RPM.


OR

With the bigger reg/rec, as you say, a capacitor/eliminator, to buffer the charging voltage.
It cooked all my bulbs, and the body of the reg/rec started to smell a bit.

[promufa]

Found the ebay thing it's a small four-cell Li battery Clicky
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'02 Triumph Speed Four

[binge]

[stinkwheel]

Please consider what happens if you overcharge a lithium battery and DO NOT fit one to your motorcycle because they are fucking dangerous at the best of times.

There are better examples but I chose THIS ONE because they used a fairly small current to achieve the effect.

How many charging phases do you have?

If it's three, Use two of them through your small reg/rec to run the flashers, brake light and horn. Use the third through a 12v AC regulator for direct lighting. They do 12v AC regulators for enfield bullets and vespas.
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[binge]

Think it's just a single phase charging system.

The standard stator has 1 ignition coil, and one lighting coil.
I've got 1 ign coil, and 5 lighting coils, but they all exit the stator through the same 2 wires (1 pink, 1 yellow), and go into a 4 pin reg/rec. They are 2 stator input pins, and 2 electric output pins.

Never understood the AC/DC thing. I always thought 12v bike systems were all DC?

And surely running 2 for one application on the bike, and 1 for the other, will just result in them all merging into one anyway? As the entire bike loom runs the same live, wherever it comes from.

How would I wire that up?



Ben

[stinkwheel]

A small lead-acid burglar alarm battery or one out of an emergency lighting unit might help.

12v AC direct lighting is unusual but not unheard of. As far as I know the Japanese never got the hang of it. Works really well on my Enfield. I have a standard H4 bulb in it.

You need more than one phase though.

EDIT: If you have a seperate phase, you just wire the AC phase into the input for the headlight switch with the regulator connected into the circuit somewhere. It can only come on when the engine is running anyway.

Your system sounds odd and you couldn't do it with a single phase.

The way the Japs do it from a single coil is to split the lighting coil output so the entire coil is charging the battery when the lights are off but when they're on, half charges the battery and half runs the lights. This necessitates a slightly more complex light switch because the charging system passes through it too.

They also tried to go too simple and not use a regulator. This means you have to carefully balance the wattage of the various bulbs or they either pop or fail to light fully. It's why all those 6v bikes with direct lighting are useless in the dark.

Not hard to get your head round the AC/DC thing though. ALL the output is AC anyway, your rectifier just dumps the backwards half of it to earth before it gets to the battery. That's why they use the AC because you get more useable amps from a weedy generator.
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[MaybeGuy]

Couldn't you just put a capacitor in there? I had one on my KTM400 to replace the battery.
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Blue_SV650S wrote: it was a sh1te wheelie, but it proves that he can get it up in 3rd and can do angles. In summery, mattsprattuk is a gobby little sh1tebag, dopehead tw4t, but sadly for all of us, he probably isn't THAT full of sh1te!!
Kickstart wrote: Hi I tend to agree with Matt. All the best Keith

[Pete.]

The battery was dead but they are cheap. This is the same one as I have here:

https://www.ebay.co.uk/itm/yuasa-12v-1-2a-h-rechargeable-battery-/170905773127?pt=UK_ConsumerElectronics_Batteries_SM&hash=item27cac72447
____________________
a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good

[N cee thirty]

98 cg's or around that use a ballast resistor to soak up the charge when the headlights not in use from what i remember.
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'00 Aprilia RS50 > '92 Honda CG > '99 Yamaha Fazer > '91 Yamaha RXS > '79 Suzuki X5 > 01' Honda Cg > 07' Honda Cg > 82' Kawasaki Z200 > suzuki gsxr 400 gk73a > honda vfr 400 NC30 Mod 2 Passed 09/06/2011

Jewlio Iglesias wrote: I actually did vote BNP once

[sickpup]

[promufa]

[stinkwheel]

[sickpup]

[stinkwheel]

It should be noted that glass mat absorbtion batteries are pretty much the pinnacle of current motorcycle battery technology. It's still a lead/acid battery but not as we know it.
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[promufa]

[sickpup]

[mudcow007]

I fly RC planes an know only too well what a lipo fire looks like


Clicky

be careful out there kids