Corsair
Void Black, battery swap
The problem
Less than a working day of runtime prompted need for a battery swap.
It is supposed to last at least 16h
-20251007
-Teardown
-Teardown
Fairly straightforward, some screws under the glued on speaker grille under after removal of earmuffs.
The cell replacement
The earpice for right ear contains the battery compartment.
Remove earmuff, pry away the speaker grille and there is 4x screws to remove.
New cell box.
Screws removed.
Be careful with speaker wires.
Be careful when removing cell
It is a Li-ion 1000mAh cell.
I was unable to source a similar one so I searched a bit and came across an Adafruit Flora 503562 experiment cell.
I had wrong connector, easily corrected.
On the battery there sits a protective cover, IPA will neeed to loosen the double sided tape.
Battery comparment glue solvent.
Cell comparison.
New cell: 1200mAh 4,4Wh nom 3,7V-2025 May 8
Old cell: 1000mAh 3,7Wh 3,7V -2020 Nov 5
Batteris with BMS.
BMS transplant
On the old cell it is spot welded, to remove it a small knife is used.
It is only welded on one of them.
Double and triple checked that polarity is correct before soldering the old BMS to new cell.
BMS is soldered to new cell.
Time to reassemble.
BMS is in "shut down" due to no voltage while desoldered, just need to wake it up by adding voltage to charge pins.
Above 3.3V is needed.
Boot BMS, connect to output pins
To fit new, plastic needs removal.
Add some capton tape and some isolationg strips before installation.
Cell now fits.
Reassembled while being careful not to pinch wires.
Old cell tested
Discharge, charge cycles done on the the cell to see if it any noticble drop in performance
Charging cell after dissasembly.
-20251008
After a night of slow charging, testing continues.
312mAh was able to be injected.
Cell accepted less then half of stated capacity, it was not empty when removed from the headset.
First dischrage cycle.
Running 100mA as load, cell dropped instantly to 4.0V, instantly.
748mAh before 3,1V is reached.
Not quite as stated 1000mAh capacity, not stated on the cell what
max voltage is, only running test between 3,1V - 4,1V
Recharging from "empty"
565mAh was able to be charged.
Running one final discharge round.
769mAh was able to be charged
It is somewhat the same as cycle one, if it is a cell thet is ment
for 3.1V to 4,1V or not is unclear -test inconclusive.
Something is off with the new cell, battery life is only 4-6 hours.
Replaceing the cell with one taken out of an IKEA Eneby pack.
Some measurements
Not really a massive upgrade, it works for a day and then some. At least it is not beeping low battery after 4h.
It works as it was when new.
Charging tíme is the same as before.