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Fast n Furious wrote:Lithium ion batteries can become very dangerous incendiary devices. Not a good idea when your battery likely resides next to 2 gallons or more of highly volatile petrol!
Charging them requires electronic management to control the charge in constant voltage as well as constant currrent mode.
Your Lammy uses a primative shunt regulator which is barely adequate to control the charge of a lead acid battery.
So, my advice would be to bin the idea.
Leotech wrote:Fast n Furious wrote:Lithium ion batteries can become very dangerous incendiary devices. Not a good idea when your battery likely resides next to 2 gallons or more of highly volatile petrol!
Charging them requires electronic management to control the charge in constant voltage as well as constant currrent mode.
Your Lammy uses a primative shunt regulator which is barely adequate to control the charge of a lead acid battery.
So, my advice would be to bin the idea.
They are sold as replacements for Vespa PX models which are virtually same trickle charging system as a Lambretta? Wouldn't that be dangerous too?
Fast n Furious wrote:Lithium ion batteries can become very dangerous incendiary devices. Not a good idea when your battery likely resides next to 2 gallons or more of highly volatile petrol!
Charging them requires electronic management to control the charge in constant voltage as well as constant currrent mode.
Your Lammy uses a primative shunt regulator which is barely adequate to control the charge of a lead acid battery.
So, my advice would be to bin the idea.
dickie wrote:Leotech wrote:Fast n Furious wrote:Lithium ion batteries can become very dangerous incendiary devices. Not a good idea when your battery likely resides next to 2 gallons or more of highly volatile petrol!
Charging them requires electronic management to control the charge in constant voltage as well as constant currrent mode.
Your Lammy uses a primative shunt regulator which is barely adequate to control the charge of a lead acid battery.
So, my advice would be to bin the idea.
They are sold as replacements for Vespa PX models which are virtually same trickle charging system as a Lambretta? Wouldn't that be dangerous too?
And many other vehicles too. I've got one on my triumph for example. But I guess it depends on what level of confidence you have in your charging system. And a typical lambretta system is a little unpredictable to say the least. Personally, if I have a good quality reg/rec fitted, AND it's a high quality installation, I'd be happy to use one.
scarkey wrote:
Can you define a High quality installation?
dickie wrote:scarkey wrote:
Can you define a High quality installation?
That's a tricky one actually, despite that being a large part of my job. There is no absolute definition and even if you follow some of the best defined standards around, like DNV, it's still possible to comply with them and do a sh1t job. But I'll give it a go anyway.....
For a lambretta charging system, I think you could limit the requirements to:
-Good quality wire with sufficient cross section for the maximum continuous current
-flow solder into any crimped connections
-apply grease to any terminals
-clean terminals properly before connecting
-all terminations are tight
-no loose components, thereby avoiding vibration damage
-a good earth connection between frame, engine and charging system
Leotech wrote:As a follow up to what said 2 weeks ago I fitted a Li Ion battery to a friends Lambretta after my favourable experiences.
All was well until it started to melt. We'd been out on a ride together, Both the Lambrettas had same charging system BGM type reg, I had checked the trickle charge rate etc. before it was used and all. It had a fuse 7.5 amp on the charging side and the supply side, both the fuses were intact. Now i'm left wondering why mine had been fine and his wasn't despite being exactly same batteries with everything pretty much the same.
I got the battery via trade account I have and they are going to talk with the manufacturers. It has put me off putting Li Ion batteries on anything now, that said I will continue to use one on my Lambretta and monitor it. I am beginning to think it's a faulty battery rather than a general issue.
Leotech wrote:As a follow up to what said 2 weeks ago I fitted a Li Ion battery to a friends Lambretta after my favourable experiences.
All was well until it started to melt. We'd been out on a ride together, Both the Lambrettas had same charging system BGM type reg, I had checked the trickle charge rate etc. before it was used and all. It had a fuse 7.5 amp on the charging side and the supply side, both the fuses were intact. Now i'm left wondering why mine had been fine and his wasn't despite being exactly same batteries with everything pretty much the same.
I got the battery via trade account I have and they are going to talk with the manufacturers. It has put me off putting Li Ion batteries on anything now, that said I will continue to use one on my Lambretta and monitor it. I am beginning to think it's a faulty battery rather than a general issue.
Leotech wrote:As a follow up to what said 2 weeks ago I fitted a Li Ion battery to a friends Lambretta after my favourable experiences.
All was well until it started to melt. We'd been out on a ride together, Both the Lambrettas had same charging system BGM type reg, I had checked the trickle charge rate etc. before it was used and all. It had a fuse 7.5 amp on the charging side and the supply side, both the fuses were intact. Now i'm left wondering why mine had been fine and his wasn't despite being exactly same batteries with everything pretty much the same.
I got the battery via trade account I have and they are going to talk with the manufacturers. It has put me off putting Li Ion batteries on anything now, that said I will continue to use one on my Lambretta and monitor it. I am beginning to think it's a faulty battery rather than a general issue.
Fast n Furious wrote:The better (much more expensive) Lithium ion batteries incorporate BMS (an electronic battery management system) which will shut down the supply when the battery is fully charged to prevent potential damage through overcharging
These batteries can more readily tolerate being charged by primitive magneto generators which have high levels of ripple current that can kill an unmanaged battery.
Modern motorbikes use alternators which have much better DC stabilty but should still use an integral BMS for optimum battery performance.
Fast n Furious wrote:The better (much more expensive) Lithium ion batteries incorporate BMS (an electronic battery management system) which will shut down the supply when the battery is fully charged to prevent potential damage through overcharging
These batteries can more readily tolerate being charged by primitive magneto generators which have high levels of ripple current that can kill an unmanaged battery.
Modern motorbikes use alternators which have much better DC stabilty but should still use an integral BMS for optimum battery performance.
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