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BOOSTXL-BATPAKMKII: Charging and Discharging Problem
Part Number: BOOSTXL-BATPAKMKII
I am experiencing the same problem with a new BOOSTXL-BATPAKMKII. I have bought a brand new one couple of weeks ago. I used it and when I try to recharge it, the same thing happened.
I left it on charging for overnight and it seems it was charged as I check the output of the battery. Then I connected it to the MSPF5529LP but, it just went to the zero. Then I remove the BATPAKMKII from MSPF5529LP and try yo charge it. Charge active LED stays ON for couple of minutes and then gone. I measured the voltage output and it was 3.32 V. I connect it to the MSPF55529LP, it worked for couple of minutes and then the output of BATPAKMKII became 0. Now it's doing the same thing, When I connect the USB, the Charge Active LED blinks one time and then stays off, also the output of the battery is 0.
Please help me out as I am kind of bored paying 25$ continuously for this equipment.
Btw, I have been using the MSPF5529LP with another BATPAKMKII for last couple of months and it is still working very well.
In reply to Murat Can Mutlu:
There may be several reasons for this behavior, that may not be directly related to having a 10k or not. I will isolate two different conditions:
1) Regarding having a 10k or not:
One possible scenario is that that not having the 10k results in a very high %TS voltage, meaning that it is likely possible that under different conditions or points along the charge cycle, the charger without the 10k transitioned into a 'Suspend Charge' mode due to a temperature fault. I want to be clear here that the temperature fault is based solely on the TS pin of the charger checking what % of the LDO pin voltage that pin reads. I attribute this random point with switching and LDO regulation along with unknown tolerances on the resistor divider network at the TS pin.
2) Other reasons beyond the 10k:
Batteries, as much as we would like, are not one in the same. What this means is that impurities, age, charging rate, etc. can affect how a battery performs during its charging cycle, and how it behaves after. One of the more common scenarios occurs with older, more charge/discharge cycled batteries or batteries with significant internal impedance. High internal impedance in batteries can trigger early 'termination' conditions in chargers. In order words, a battery would look like it was fully charged as it reached the float/cut-off voltage, but in reality it did not. Once the charger stops pumping current into the battery, all Li-ion batteries relax, and this relaxation will cause a dip in battery voltage that could be large if internal ESR is high.
One way to check if the performance is based on the battery is to fully discharge both batteries, then swap the charger you put them on and see if the result is the same, or if it moves with the battery.
My last comment here is that this is in no way damaging to the battery. It just won't be fully charged. Micro-damages comes to batteries during over-voltages, under-voltages, and various high and low temperature states.
We are glad that we were able to resolve this issue, and will now proceed to close this thread.
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In reply to Joel Hernandez II:
Do, click "This Resolved my issue", if any of my replies helps solve your problem. For Tiva ARM Forum, see links below.
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In reply to Markel Robregado:
I think the board is reliable. Here is the one caveat:
When the board was initially designed, the "NTC" through-hole was left unpopulated.
I imagine this was done to allow customers to use an external thermistor connected attached to the battery in order to test the temperature-based charge suspension provided by the charger. However, customers that do not use this would likely need to place a 10kOhm resistor here in order to achieve normal operation.
In addition, the variation between Booster Packs is likely due to variation in those two TS pin resistors on the board. They are likely 1%, maybe even 5% tolerant, meaning some boards will push the charger further in a Temp Fault than others (without a 10k).
I confirmed that putting a 10k ohm resistor across R9 ensures charging. I see the charge active led on constantly. Before it will just briefly turn on. But, putting a 10k ohm resistor across R9 was not mentioned at slau618.pdf. As you have said there might be a variation in those TS pin resistors, meaning there is a problem with the board.
Please communicate these solution to launchpad team. It would also be a good idea to put a sticky post about this.
Seong Kim - see Joel solution in this post.
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