Hello
I have few dozens of Acer AP18H8L batteries, that are pulled from new laptops, which were stored at warehouse for 3+ years
All batteries are of the same condition - overdischarged and locked
The NLBA sofware "refuses" to unlock them because of overdischarge
Fuse is ok at the moment
After opening the battery and some direct charging, NLBA is ready to unseal and unlock the chip
The fuse is still ok
The chip is unsealed, but fuse was burned at this moment
Errors cleared, and battery works fine after fuse "restoration"
I repeated this on 4 batteries yet, and got always the same result.
Is there any way to prevent fuse burning without soldering?
Yes, there is special trick to preven fuse burning which was discussed on the forum already. It is to connect series resistor 20...50 Ohms between V terminal of green connector and red wire to limit the current from the NLBA1 output when Power On button is pressed.
Thank you for the information
I'll try this way and report the result
Nothing helped
I used resistors from 33Ohms to 1kOhm, but the fuse was always being burned.
It looks like the pcb "uses" energy from cells to burn the fuse
According to Fuse Blow Concept there could be two energy sources, which powers fuse heater, primary - cells stack or secondary - external source connected to the pack. Primary source is only used when its full voltage is over FUSE_BLOW_MINIMUM_VOLTAGE parameter preprogrammed in eeprom on the factory. It is done to prevent the cells to be fully depleted if their power is not enough to melt the fuse from the first attempt, otherwise all their energy could be spent into the heater below melting point. So another tip could be not to precharge the cells high enough and let the full voltage to be below minimum blow permit threshold.
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