The FW16 supports up to 240W power supply. Let’s the the battery is drained and the laptop is off, how much of this can go to the battery? I suppose charging with 240W is a bit much.
I think amoun is correct. It can allow up to 240W (PD 3.1), but I doubt the battery will be charged at that rate. Power usage is for the entire unit (battery charging, and the other laptop components such as CPU, GPU, memory, display, etc). Maybe 80W is safe like you said. If that’s the case, the rest of the power can be used elsewhere or just not used.
My current laptop has a 65W PSU. When completely dead, it can actually pull 50W to charge the battery (with laptop off). With it on, it uses the whole 65W (observed through a Kill-A-Watt meter). When fully charged, even if I max out CPU (it’s only iGPU), I only see 55W of usage. So there’s definitely power budgeting going on there.
2 Likes
How flexible is the charge controller?
If I provide is 25w from a charger will it charge still if I’m drawing sub 25w? Yet supplement the battery if drawing above?
For my Gen 11 Batch 1 FW13, a 30 watt charger will charge while in use, (not Heavy use, though). Anything smaller didn’t really want to charge, while the computer is in use. Turned off, it would charge slowly.
1 Like
Basically.
My work laptop won’t charge at all unless it’s negotiated 20v5a minimum
My partner’s laptop is smaller and wants 20v3a minimum.
Both laptops won’t likely draw this but they want to negotiate that.
Will the fw13 charge on a 25 or 45w pd charger even if the battery depletes a bit?
Let’s say I’m using 45w total power and supplying 25w, will it then just pull 20w from the battery?
Or just stop using ac unless I can supply enough power?
I have not seen any reports of a minimum cut-off where the laptop will not charge if it’s unable to negotiate high enough. In fact an “emergency charge” exists where it will take 5v.
That being said, a 45w (and especially a 25w) will charge slower because the voltages available are less than what Framework’s supplied adapter can provide.
1 Like
On both Framework Laptop 13 and Framework Laptop 16, the batteries are designed to charge at 1C, and the charging circuitry will only ever charge up to that rate, regardless of the power adapter wattage. That means up to 55W/61W on 13 and 85W on 16. Charging above 1C would require either putting extra wear on the battery that limits cycle life, or using a battery chemistry that has less energy density.
There is some loss in the charging circuity, so you’ll need something like a >60W/65W power adapter for 13 and a >90W power adapter for 16 to charge the battery at full rate if the system is in standby, or more if the system is in active use.
7 Likes
Is that just the battery?
I.e there is benefits in having a 100w charger? 1c into the battery. If you have a 65w charger you have nothing left over. So if I draw 40w on the platform, only 25w can go into the battery?
If I have 100w it means 60w can go into the battery while 40w can be used by the system
Yes. But be aware that li-ions don’t charge at full current all the way to 100%. Charge rate tapers off in the later half.
Example li-ion charge profile at 1C
In that example, the charge current starts to drop even before the battery reaches 60%.
Thanks! Even better than I guess. You’re less likely to affect charge beyond 60% if using it plugged in on a lowe spec charger.
Sorry I’m struggling to work out this graph?
Yup got it thanks, so total watts is akin to percentage charge? Also do you have a max %?
Thats a strange power curve unless you was using it a lot for the first hour and had less AC available for the batter?