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10. Replace protection resistors
If batter cells were reversed or fully empty battery cells were installed, the corresponding protection resistors can
be burn out. If that
’s the case, those battery cells will no longer be charged. To fix this issue, you will need to find
out the damaged protection resistors which are marked as
“R015” by measuring the resistance higher than
0.015ohm. All damaged protection resistors need to be replaced.
Digi-Key Part Number WSLE-.015CT-ND WSLE-.015CT-ND
Manufacturer Vishay Dale
Manufacturer Part Number WSL2010R0150FEA
11. Eliminate possible audible noise
When lower voltage switching mode DC power is used, for example a 12V/4A switching mode DC power adapter,
sometimes there could be audible noise generated when charging the battery cells. The reason is that with lower
voltage, the charger will draw much higher current from the switching power supply. This can cause higher ripple
to the circuit and sometimes may fall into audible frequency range though it still fully functional.
To fix this issue, you can just simply replace it with a higher voltage power supply, say, a standard 18.5V laptop
adapter, or high current linear power supply.
12. Notice of connecting OLED display board with FFC/FPC cable
If you want to move the OLED display board externally to the LifePO4 power supply board, you will need to
connect it with the LifePO4 power supply through the supplied FFC/FPC cable. Please make sure the DC power
(J5 and J6) are fully disconnected before you doing this kind of jobs.
M. LifePO4 power supply pictures
