I only bring this up because the battery cells and the electronic memory do go out of sync more often than the battery fails. I understand that all batteries have a lifetime and will eventually require replacement.
The supposedly "dead" cells in this battery supplied a 1 amp for 3 hours into a 16 ohm resistive load. That's 3000 mAh, a little less than the battery rating of 3900 mAh, but still very usable. Now the electronics will see at least a 3000 mAh recharge and should reset the capacity and allow the laptop to operate well over 30 minutes. To protect the battery, the internal electronics disconnects the cells from the laptop when the logic is that the battery is close to depletion. This stops cell reversal and battery damage, but if the logic is out of sync with the real condition of the battery the shutoff will occur too early.
It would be nice to accomplish the electronic reset without opening the battery and doing a manual discharge, but if that's what it takes......
Just because a Li-Ion battery does not suffer from the "memory effect" of other types of batteries, it doesn't mean it will last for ever. Chemical conversions inside the battery make it to produce electric energy but these chemical reactions aim to attenuate as time and charge cycles pass over. It's not the electronics, the battery is getting worn out. (The electronices are there as safety circuits, nothing to reset - NOR SHOULD YOU EVER ATTEMPT TO DO SO. IT WILL CAUSE A FIRE).
Consider rebuilding it instead of replacing it. Here's a website that discusses just how to do this.
RCC344
4 Posts
0
June 12th, 2006 16:00
I only bring this up because the battery cells and the electronic memory do go out of sync more often than the battery fails. I understand that all batteries have a lifetime and will eventually require replacement.
The supposedly "dead" cells in this battery supplied a 1 amp for 3 hours into a 16 ohm resistive load. That's 3000 mAh, a little less than the battery rating of 3900 mAh, but still very usable. Now the electronics will see at least a 3000 mAh recharge and should reset the capacity and allow the laptop to operate well over 30 minutes. To protect the battery, the internal electronics disconnects the cells from the laptop when the logic is that the battery is close to depletion. This stops cell reversal and battery damage, but if the logic is out of sync with the real condition of the battery the shutoff will occur too early.
It would be nice to accomplish the electronic reset without opening the battery and doing a manual discharge, but if that's what it takes......
enigma-2
238 Posts
0
June 12th, 2006 16:00
Just because a Li-Ion battery does not suffer from the "memory effect" of other types of batteries, it doesn't mean it will last for ever. Chemical conversions inside the battery make it to produce electric energy but these chemical reactions aim to attenuate as time and charge cycles pass over. It's not the electronics, the battery is getting worn out. (The electronices are there as safety circuits, nothing to reset - NOR SHOULD YOU EVER ATTEMPT TO DO SO. IT WILL CAUSE A FIRE).
Consider rebuilding it instead of replacing it. Here's a website that discusses just how to do this.
http://www.electronics-lab.com/articles/Li_Ion_reconstruct/index_1.html