Lithium battery
9 posts
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Think my battery is playing up!
Do I replace like for like or upgrade
What about Lithium battery, add lightness and all that,
Just interested
Do I replace like for like or upgrade
What about Lithium battery, add lightness and all that,
Just interested
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>.....ELAN 1969 S4 SE COUPE.....<
>...SEE YOU ON THE FLIP SIDE...<
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>.....ELAN 1969 S4 SE COUPE.....<
>...SEE YOU ON THE FLIP SIDE...<
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Crusty - Second Gear
- Posts: 85
- Joined: 02 May 2010
A lithium battery to run an Elan will cost around ?220 from the likes of Antigravity Batteries in Southend. I have one and it weighs 980gms! The battery clamp will weigh more
However, you will need to get a battery charger designed for lithium batteries as standard chargers will kill them. They are around ?50 for a decent one. They also need more care than lead/acid and mustn't be discharged as that will also kill them.
However, you will need to get a battery charger designed for lithium batteries as standard chargers will kill them. They are around ?50 for a decent one. They also need more care than lead/acid and mustn't be discharged as that will also kill them.
- stevebroad
- Fourth Gear
- Posts: 917
- Joined: 08 Mar 2004
I would also mention that there are different kind of Lithium batteries available, Li-Ion and LiFePo4, the latter "do not explode".
And in both flavours you can get batteries with or without battery managment systems (BMS), the latter obvoiously being cheaper. The BMS protects the battery from "High Amps", "High Volts" and shuts off at "Low Volts".
Downside of the BMS is also that it allows only a maximum of ampere, so you need to check if it delivers what you need for the starter...
Batteries without BMS give all Amps they can deliver, but if you expose it to high Volts or drain it below a certain voltage, you buy a new one...
And in both flavours you can get batteries with or without battery managment systems (BMS), the latter obvoiously being cheaper. The BMS protects the battery from "High Amps", "High Volts" and shuts off at "Low Volts".
Downside of the BMS is also that it allows only a maximum of ampere, so you need to check if it delivers what you need for the starter...
Batteries without BMS give all Amps they can deliver, but if you expose it to high Volts or drain it below a certain voltage, you buy a new one...
1964 S1 (at paint shop)
1967 S3 DHC
1969 S4 FHC (at BB's home)
https://theelanman.com for details on Brian Bucklands book.
https://shop.lotus-books.com for more Lotus related books.
We ship worldwide. PM/Email me.
1967 S3 DHC
1969 S4 FHC (at BB's home)
https://theelanman.com for details on Brian Bucklands book.
https://shop.lotus-books.com for more Lotus related books.
We ship worldwide. PM/Email me.
- gherlt
- Fourth Gear
- Posts: 636
- Joined: 20 Jul 2006
Saving 30+ lbs is a suitable reason to make the change.
With the lighter weight and smaller size, the battery can be relocated up close to the starter for less voltage drop during starting. Use a geared starter for less current draw and faster cranking speed.
Check the maximum current draw of the starter and if it exceeds the maximum allowed by the BMS, do not use the BMS. The original generator had a safe rate of charging. If you convert to an alternator, get the smallest one possible to limit the maximum recharge rate to maximize the life of the battery. Many modern alternators have a charge rate of 40+ amps, and it is easy to get 80 or 100+ amps, far in excess of the needs of the battery. In this case, more is definitely not better.
David
1968 36/7988
With the lighter weight and smaller size, the battery can be relocated up close to the starter for less voltage drop during starting. Use a geared starter for less current draw and faster cranking speed.
Check the maximum current draw of the starter and if it exceeds the maximum allowed by the BMS, do not use the BMS. The original generator had a safe rate of charging. If you convert to an alternator, get the smallest one possible to limit the maximum recharge rate to maximize the life of the battery. Many modern alternators have a charge rate of 40+ amps, and it is easy to get 80 or 100+ amps, far in excess of the needs of the battery. In this case, more is definitely not better.
David
1968 36/7988
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msd1107 - Fourth Gear
- Posts: 848
- Joined: 24 Sep 2003
Plus the extra weight saving of a shorter battery cable
The charging issue is something I hadn't thought about. I will discuss with Antigravity tomorrow.
The charging issue is something I hadn't thought about. I will discuss with Antigravity tomorrow.
- stevebroad
- Fourth Gear
- Posts: 917
- Joined: 08 Mar 2004
So, you save on battery weight, but then need to add a box to limit current so your Elan doesn't become a puddle when the battery becomes a light source (examine photos of hoverboard burnups and then consider the much greater potential of a high-amp battery)
Seems to me that if you want to run one, you want one capable of meeting all of your battery needs for an outing without re-supply. Then get real weight savings by removing the dynamo/alternator.
Back in the day when I couldn't afford a replacement and my dynamo wouldn't dynamize, I recharged overnight and ran during the day/night. Always got me home, planning sometimes required, headlights occasionally dim on arrival. LED's would help here...
Seems to me that if you want to run one, you want one capable of meeting all of your battery needs for an outing without re-supply. Then get real weight savings by removing the dynamo/alternator.
Back in the day when I couldn't afford a replacement and my dynamo wouldn't dynamize, I recharged overnight and ran during the day/night. Always got me home, planning sometimes required, headlights occasionally dim on arrival. LED's would help here...
- denicholls2
- Fourth Gear
- Posts: 656
- Joined: 23 Jan 2006
denicholls2 wrote:So, you save on battery weight, but then need to add a box to limit current so your Elan doesn't become a puddle when the battery becomes a light source (examine photos of hoverboard burnups and then consider the much greater potential of a high-amp battery)
Seems to me that if you want to run one, you want one capable of meeting all of your battery needs for an outing without re-supply. Then get real weight savings by removing the dynamo/alternator.
Back in the day when I couldn't afford a replacement and my dynamo wouldn't dynamize, I recharged overnight and ran during the day/night. Always got me home, planning sometimes required, headlights occasionally dim on arrival. LED's would help here...
Not a good idea with Lithium batteries as when they drop below a certain voltage they die, permanently.
- stevebroad
- Fourth Gear
- Posts: 917
- Joined: 08 Mar 2004
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