Thank you for your suggestion. This kind of battery is more suitable for fast charging of high current batteries instead of small batteries
The higher power of usb-pd is used in the charger. It is expected that there will be some difficulties, mainly in terms of cost, protocol and current distribution
18650 to 26800 works for me. I have plenty of chargers for smaller batteries. I only charge one or two batteries at a time, but a four slot with slot 1 & 4 for 26800 would work too. Storage voltage and 4.0v options would be nice, but not required for me. I can just check the voltage every now and then, lol. I do not like chargers that get really hot. High quality with whatever extras you think will sell best. Thanks for asking.
It could be improved by making the top part of the positive terminal a bit bigger, and by adding a small nipple on that big bit so that flat top 10440 and 14500 cells easily fit.
I managed to short a flat top 14500 cell in my S4+ charger and it left a burn mark on the insulation ring.
I agree that keeping a standard barrel plug (Or whatever is currently used) would be cheaper but I would like to see consolidation of power input ports from manufacturers across industries.
It’s not a deal breaker for me though, just something that’s nice to have. Ultimately you have to decide from a business perspective whether it’s worth pursuing.
I usually charge to full, but since 90% of my batteries are in storage at most times and not in actual use, they have less lifetime because they are stored full. Charging to 80% of energy (that is 4.0V?) will make them both suitable for storage and for normal use.
Come to think of it, my ideal setting would be 90% instead of 80, as a compromise between usability and battery lifetime. Maybe a charger could have user settings for 70, 80, and 90 ?
Do you mean that the service life when I charge to 4.20V is much shorter than that when I charge to 80-90%? If not, there is no meaning. It is expected that the new charger will increase the storage function to 3.70v
If you need such a program, you need a very high-end charger to appear
It is equivalent to adjusting different charging voltages
I found this on batteryuniversity.com. I'm not sure how old this specific data is (which generation of batteries is used to generate these numbers?) but the article had its last update in nov 2021. It shows that for maximum service life you should charge to 3.95V (so not 3.7V as I always thought), but changing from 4.2V to 4.05V already more than doubles the service life of the battery.
CHARGE LEVEL* (V/CELL)
DISCHARGE CYCLES
AVAILABLE STORED ENERGY **
[4.30]
[150–250]
[110–115%]
4.25
200–350
105–110%
4.20
300–500
100%
4.15
400–700
90–95%
4.10
600–1,000
85–90%
4.05
850–1,500
80–85%
4.00
1,200–2,000
70–75%
3.90
2,400–4,000
60–65%
3.80
See note
35–40%
3.70
See note
30% and less
Table 4: Discharge cycles and capacity as a function of charge voltage limit
Termination voltage is a requirement. I want to charge my batteries to 4.1V not all the way to 4.2. So, a configurable termination voltage. Note this is for a battery that is going to be used soon and is a different concept from storage voltage.
Some good suggestions. I really like the S4+, but it could use some improvements (don’t make it a MC3000!). BlueswordIM on here has some great ideas for a charger…
Support for 26800 batteries with charge rates up to 4-5 amps for the 6000 and 6800 mAh cells
Support for charge rates under 250 mA, like 100 to 150
Support for Hv li-ion 4.35 v and lifeP04
Storage mode at 3.6 to 3.7 volts
More accurate iR measurement…mine is about 50% higher than advertised (my Zanflare C4 charger does a lot better)
Make a separate display for each slot maybe? Ine that has all of the parameters: charge/discharge current, accumulated/discharge capacity, volts(realtime), iR
Manually selectable delta V for NiMH maybe? Some like that feature
Discharge current up to 1.5 A across all bays (fan cooling)
Keep the standard power input with the SMPS and 5.5x2.1mm connector. It’s lowering cost and works fine…don’t see a need for a $50 type C adapter.
This is all very intriguing! Thank you Vapcell, for listening to us. I really like how this thread is progressing. We each have different wants and needs. Most of what has been asked for has been mentioned several times for at least a decade. The key this time, will be in producing a charger that actually performs to spec through rigorous testing BEFORE releasing it into production… which is something several other manufacturers never seem to accomplish. Please… no more e-waste. Do it right the first time and sell thousands of chargers to us. Failing to do so will likely result in countless returns, disputes and bad press for your company. Xtar opened similar threads and I dont think they ever went anywhere. The MC3000 development was lead by a (now banned) sociopathic narcissistic, which reflected the end product.