1 point by janlin1999 27 days ago | parent | context | next | edit | delete [–] | on: Ask HN: Who is hiring? (November 2025)
DocSpot | ONSITE (Santa Clara, CA) | https://docspot.com
DocSpot helps people find doctors by indexing information from a plethora of sources and empowering patients to search through one unified interface.
Tiny company, entry-level candidates welcome (no experience required):
Thanks for your response. If the water comes in contact with the exterior of the filters, the plastic casing does seem to undermine the point of the move.
> If you charge and discharge a lithium ion cell from 4.2V to 2.75V, you might get 250 full cycles. If you stop charging at 4V and call that 100%, and stop discharging at 3.2V, you might get 2000 cycles before capacity is reduced.
Is there literally an almost 10x difference in the number of full cycles? Where can I read more about this?
The top end charge voltage is particularly sensitive, this is the most chemically unstable state of the cell charge cycle.
I really wish cell phones and computers came with an adjustment to max cell voltage. Cutting even 10% capacity can double your cycle life. Some do, but it's a hodgepodge and not standard.
Thanks for the link. It is not clear to me if the resource is geared towards cell phone batteries or if it also applies to EV batteries, but I wouldn't be surprised if the trends apply to larger batteries as well.
Having said that, this resource does not seem to support the magnitude of the numbers in LeifCarrotson's comment that I was replying to. First, I did not see a relationship between voltage and Depth of Discharge (seems unlikely to be linear, especially given table 4), which is what the page seems to mostly talk about. Second, comparing 4.2V to 4.0V in table 4 suggests a 4x difference in the number of cycles, not a ~10x difference. Figure 6 also seems relevant and suggests maybe a 2x difference.
Something to keep in mind is that all of the tables are only trying to measure one thing and lay out the effect of the one variable. But in reality these can be mixed and matched for the desired performance characteristics. 10x is indeed possible by doing multiple things to extend the life of the cell.
Pull 4x from one table and 2-3x from another and it would probably put you somewhere in the 10x range. Though I'm not sure it would be strictly multiplicative.
If you will have less than $250,000 in the account for the foreseeable future or don't mind splitting your money, you have a lot more options. We chose FirstIB for their free outgoing ACH. At the time, they also offered higher interest rates than the larger banks.
> In addition, I object to the 'black market' terminology. [...] black is an actual term related to a race that's misappropriated with a derogatory connotation.
It doesn't appear that "black" in "black market" refers to race:
Yeah, it's worth noting that black people weren't usually referred to as black people in western societies back then, but various variations of the N word.
Black is an actual colour, and in opposition to light. That's where all these black/grey/white trichotomies come from.
The usage of black as an adjective to describe illegal deeds and things not only precedes the slavery in the North America but existed in cultures which never even seen people with a black skin. But you can't argue with SJW with logic.
DocSpot has been building a search engine to help patients find doctors in the US and one of the big problems in this space is indexing information about doctors from a variety of sources.
DocSpot | ONSITE (Santa Clara, CA) | https://docspot.com DocSpot helps people find doctors by indexing information from a plethora of sources and empowering patients to search through one unified interface.
Tiny company, entry-level candidates welcome (no experience required):
Back-end developer: https://docs.google.com/document/d/1IvcTtE7yE7m5u0NfrVmvtR_i...