Electronics > Projects, Designs, and Technical Stuff
Hotspot battery getting overcharged
NiHaoMike:
--- Quote from: blueskull on April 24, 2020, 05:11:27 pm ---Then your protection board only does OCP and dead short detection, which is the bare minimum. Those are hard to come by as newer chips almost all do UVP/OVP as well.
--- End quote ---
A bit silly to use active components just for overcurrent protection in a battery pack when a much cheaper fuse will do just that. Most likely it's just defective in some way.
--- Quote from: Renate on April 24, 2020, 06:25:54 pm ---The previous one I just wired a USB cord to a dropping diode to the terminals for the battery. (i.e. no battery).
--- End quote ---
A trick from Perk coin mining back in the day, put into use soon after those running some mining racks had the batteries expand from running the (cheap) phones 24/7 under heavy load. Some just hardwired the battery connection to 5V, hard to tell if that causes any early failures since it wasn't at all unusual for those cheap phones to break down after 6-12 months of mining use.
amyk:
--- Quote from: NiHaoMike on April 24, 2020, 06:56:41 pm ---
--- Quote from: blueskull on April 24, 2020, 05:11:27 pm ---Then your protection board only does OCP and dead short detection, which is the bare minimum. Those are hard to come by as newer chips almost all do UVP/OVP as well.
--- End quote ---
A bit silly to use active components just for overcurrent protection in a battery pack when a much cheaper fuse will do just that. Most likely it's just defective in some way.
--- End quote ---
DW01-based battery protection boards are cheap and ubiquitous, and offer far more protection than a fuse.
Also, about letting the battery go to 5V, that would definitely damage it irreversibly and could've resulted in a fire. Lion cells should be treated with extreme caution.
drummerdimitri:
--- Quote from: amyk on April 25, 2020, 12:02:58 am ---
--- Quote from: NiHaoMike on April 24, 2020, 06:56:41 pm ---
--- Quote from: blueskull on April 24, 2020, 05:11:27 pm ---Then your protection board only does OCP and dead short detection, which is the bare minimum. Those are hard to come by as newer chips almost all do UVP/OVP as well.
--- End quote ---
A bit silly to use active components just for overcurrent protection in a battery pack when a much cheaper fuse will do just that. Most likely it's just defective in some way.
--- End quote ---
DW01-based battery protection boards are cheap and ubiquitous, and offer far more protection than a fuse.
Also, about letting the battery go to 5V, that would definitely damage it irreversibly and could've resulted in a fire. Lion cells should be treated with extreme caution.
--- End quote ---
I never said I charged the battery to 5V! I applied 5V to the protection board detached from the battery and used a power supply and load to simulate a battery being drained and it did nothing to stop the "battery" from working up to this voltage so there is no OVP on the board itself.
drummerdimitri:
I will be buying a new li-ion battery pack that fits the footprint of the original battery by keeping the plastic case and just replacing the battery section.
Will be using two diodes back to back to drop the voltage to around 4.2V but currently only have Schottky diodes that drop the voltage by 0.17V so the battery will only be charged to 4.11V thus reducing the effective capacity.
Are there any diodes that I can use with a voltage drop of 0.8-1V? I could use four diodes to do this but I'd like to keep the component count low as I am not sure how much I can fit in that case when the new battery arrives.
NiHaoMike:
--- Quote from: drummerdimitri on May 15, 2020, 12:54:58 pm ---Will be using two diodes back to back to drop the voltage to around 4.2V but currently only have Schottky diodes that drop the voltage by 0.17V so the battery will only be charged to 4.11V thus reducing the effective capacity.
--- End quote ---
That's close to perfect! If you need more capacity, buy a slightly bigger battery.
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