3 ms·

We'll need to know how quickly it can be charged, how many charge cycles it takes, how it drains when not in use, etc etc, but you are right, it's a promising s

We'll need to know how quickly it can be charged, how many charge cycles it takes, how it drains when not in use, etc etc, but you are right, it's a promising start, one to watch to see where it ends up.

abracadaniel 5y ago
Past a certain capacity, I wonder where the need for rapid charging begins to decrease. It might be an interesting trade off.
- pkulak 5y ago
  1C, which isn't fast charging, is already 200kW with this battery. So yeah, if you can make a battery with a massive capacity, but it can't fast charge, that could be a great tradeoff.
MattRix 5y ago
In the article they state they charged it at 1C, which is 1 hour from 0% to fully charged (200kw for a 200kwh battery). Who knows what the final numbers will be, but very promising if true.
- pkulak 5y ago
  Yeah, but maybe that was one of the 100 the battery can take before it's at 70% life. There are just so many sliders with a battery, and they all effect each other. Getting them all up at once is the grail.
  - Wistar 5y ago
    Nice analogy, the "sliders."
- karamanolev 5y ago
  1C is usually not 1hr from empty to fully charged, because of CC-CV charging. Most Li based chemistries charge at 1C until a certain threshold (when the needed voltage for 1C charging reaches a maximum predetermined level, usually the target max cell level, e.g. 4.2V). After that, you charge at constant voltage until you reach full charge. If the battery is significantly oversized, i.e. it treats 85% charge as 100% for the user, then 1C might be possible from 0 to 100%, but usually it's not.
gpapilion 5y ago
Just assume it takes twice as long to charge, since the circuit will be a factor if you double the capacity. Your 208 40amp circuit can only deliver so much power, and even dc fast chargers can only go as fast as they can consume power from there circuits.
AtlasBarfed 5y ago
LFP charges pretty well since it is so much safer. The real mystery is the "non-LFP" battery cells they used.
throwawayboise 5y ago
Exactly. It sounds good, but can it do this at least two or three times a month for 10 years?

abracadaniel 5y ago

Past a certain capacity, I wonder where the need for rapid charging begins to decrease. It might be an interesting trade off.

pkulak 5y ago
1C, which isn't fast charging, is already 200kW with this battery. So yeah, if you can make a battery with a massive capacity, but it can't fast charge, that could be a great tradeoff.

MattRix 5y ago

In the article they state they charged it at 1C, which is 1 hour from 0% to fully charged (200kw for a 200kwh battery). Who knows what the final numbers will be, but very promising if true.

pkulak 5y ago
Yeah, but maybe that was one of the 100 the battery can take before it's at 70% life. There are just so many sliders with a battery, and they all effect each other. Getting them all up at once is the grail.
- Wistar 5y ago
  Nice analogy, the "sliders."
karamanolev 5y ago
1C is usually not 1hr from empty to fully charged, because of CC-CV charging. Most Li based chemistries charge at 1C until a certain threshold (when the needed voltage for 1C charging reaches a maximum predetermined level, usually the target max cell level, e.g. 4.2V). After that, you charge at constant voltage until you reach full charge. If the battery is significantly oversized, i.e. it treats 85% charge as 100% for the user, then 1C might be possible from 0 to 100%, but usually it's not.

gpapilion 5y ago

Just assume it takes twice as long to charge, since the circuit will be a factor if you double the capacity. Your 208 40amp circuit can only deliver so much power, and even dc fast chargers can only go as fast as they can consume power from there circuits.

AtlasBarfed 5y ago

LFP charges pretty well since it is so much safer. The real mystery is the "non-LFP" battery cells they used.

throwawayboise 5y ago

Exactly. It sounds good, but can it do this at least two or three times a month for 10 years?