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Step 6Completion
-If your battery doesn't explode/catch on fire, that means the circuit is good/the cells are good.
-Solder it permanently to to the circuit, and fit it back into the plastic housing if its the same number of cells, if not be creative and line the cells up so it fits nicely below/behind/etc your laptop. Use duct tape or if you have, shrink wrap it with rubber shrink wrap.
-And remember, be careful around rechargeable lithium batteries.
-Update: I forgot to mention. Depending on the type of "smart" fuel gauge, adding more cells won't change the 'estimated hours left' displayed by the laptop, this is because the number of hours might be a fixed range. One might think that even if it's a fixed range, the number of hours left or % capacity left might be proportional to the actual number, however, depending on the type of circuit used to count the "electrons" (some use ic's called electron counters), it might assume the capacity to be fixed as well, thus the estimated capacity won't be proportional, just truncated. However, from my experience, the capacity gauge stops at about 7%, until the physical battery drains until 7%, so it still effectively alerts the user when the battery is drained after below 7%.
-Update 2: At first I thought my smart board fuel gauge circuit was of fixed capacity, but after a few complete discharges, it recalibrated. Now it knows the capacity of my new pack and estimates accordingly (ranges from 9 - 8 hours total runtime depending if I'm constantly using my secondary hard drive accessed via USB and/or lcd backlight levels)
-Solder it permanently to to the circuit, and fit it back into the plastic housing if its the same number of cells, if not be creative and line the cells up so it fits nicely below/behind/etc your laptop. Use duct tape or if you have, shrink wrap it with rubber shrink wrap.
-And remember, be careful around rechargeable lithium batteries.
-Update: I forgot to mention. Depending on the type of "smart" fuel gauge, adding more cells won't change the 'estimated hours left' displayed by the laptop, this is because the number of hours might be a fixed range. One might think that even if it's a fixed range, the number of hours left or % capacity left might be proportional to the actual number, however, depending on the type of circuit used to count the "electrons" (some use ic's called electron counters), it might assume the capacity to be fixed as well, thus the estimated capacity won't be proportional, just truncated. However, from my experience, the capacity gauge stops at about 7%, until the physical battery drains until 7%, so it still effectively alerts the user when the battery is drained after below 7%.
-Update 2: At first I thought my smart board fuel gauge circuit was of fixed capacity, but after a few complete discharges, it recalibrated. Now it knows the capacity of my new pack and estimates accordingly (ranges from 9 - 8 hours total runtime depending if I'm constantly using my secondary hard drive accessed via USB and/or lcd backlight levels)
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Mar 14, 2011. 4:43 PMrmckinney
says:
Did you have to cut a hole in your battery casing in order to the smart circuit, then?
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