thunderstorm80
1 kW
- Joined
- Mar 29, 2016
- Messages
- 383
Hi,
5.5 years ago I bought four A123 packs of 39.6V 2.3Ah each.
I thought they were pricey then, but now after 5.5 years of abuse with motor that draws 2800W and regens 1200W, I feel stupid for not buying more. They are still perfect! Even they don't have BMS - individual checking shows that all cells are balanced.
What happened to this company and why everybody recommends LG/Samsung cells that although have an initial higher specific energy at the beginning of their service, they lose the advantage to the A123 after 1.5-2 years and keep declining while the A123 stays intact. (The A123 with their LiFePo4+nano technology have a negligible aging effect)
Because I need a longer range (I only have 360Wh but the cells are perfect as new), I need to change...
What do you think about the 20Ah prismatic cells A123 makes? The specs claim the same power performance and abuse, and a much higher energy density of 137Wh/Kg instead of 100Wh/kg in the 26650 cells that I have.
Looking at the spec I really don't understand how anyone can think of other Li-Ion chemistry...
Also - since I have no experience in soldering cells together (especially prismatic cells which I never saw before besides pictures), what would you suggest?
Are there shelf-ready battery packs for sale, somewhere? I need 16S, but so far found none at any configuration.
If not - can you direct me to the tools/guides/parts of how creating such a pack by myself, along with the protection circuit?
Thanks for any info,
Roy
5.5 years ago I bought four A123 packs of 39.6V 2.3Ah each.
I thought they were pricey then, but now after 5.5 years of abuse with motor that draws 2800W and regens 1200W, I feel stupid for not buying more. They are still perfect! Even they don't have BMS - individual checking shows that all cells are balanced.
What happened to this company and why everybody recommends LG/Samsung cells that although have an initial higher specific energy at the beginning of their service, they lose the advantage to the A123 after 1.5-2 years and keep declining while the A123 stays intact. (The A123 with their LiFePo4+nano technology have a negligible aging effect)
Because I need a longer range (I only have 360Wh but the cells are perfect as new), I need to change...
What do you think about the 20Ah prismatic cells A123 makes? The specs claim the same power performance and abuse, and a much higher energy density of 137Wh/Kg instead of 100Wh/kg in the 26650 cells that I have.
Looking at the spec I really don't understand how anyone can think of other Li-Ion chemistry...
Also - since I have no experience in soldering cells together (especially prismatic cells which I never saw before besides pictures), what would you suggest?
Are there shelf-ready battery packs for sale, somewhere? I need 16S, but so far found none at any configuration.
If not - can you direct me to the tools/guides/parts of how creating such a pack by myself, along with the protection circuit?
Thanks for any info,
Roy