At Fixya.com, our trusted experts are meticulously vetted and possess extensive experience in their respective fields. Backed by a community of knowledgeable professionals, our platform ensures that the solutions provided are thoroughly researched and validated.
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
Yes, there can be a problem doing this. First off, 3 AA batteries does not equal 4.2 volts, they are 1.2volt nominal so 3 * 1.2 = 3.6volts. When they are just off the charger, terminal voltage will be closer to 1.5v, so 1.5*3 = 4.5 volts.
Using ohms law, E=I * R, we can find your current as I = E / R or I = 4.5v / 4r7 as .95Amps (almost a full amp) that you would see worst case. The resistor is doing nothing for you.
The reason that the charge light blinks intermittently is because the charge controller (lithium battery, right?) is pulsing due to low voltage.
Try this: Take *6*, yes, 6, AA batteries, your choice of chemistry, and put them in series. That will give you a nominal (alkaline) voltage of 9v. Connect a low dropout 5v regulator such as an LT1117-5. Then you will be able to use your battery backup much more effectively.
On a different note, I used 4xAA (NiMH) and powered my ipaq 3650 directly. Worked great. Your mileage may vary though.
y hp6365 keeps telling me that i my backup battery is low..i keep
charging my phone but the only the main battery is charging..how do i
charge or change the backup battery?
Looks like either the devices connected to the backup battery are consuming too much power than that backup can handle or the backup battery is getting worn-off. You may need to change the batteries or take-off some load (remove some devices that consume power) from the backup battery.
The MobilePro 900 back up battery is low and should be replaced. The battery is a CR2032 coin-cell battery, which is very common and can be purchased at most department and drug stores.
Refer to section 1-7 of the "MobilePro 900 Handheld PC's User's Guide" for detailed replacement instructions.
The back up battery should be replaced immediately upon seeing the message "Backup Battery Very Low - Your back up battery is very low or missing. Data loss may result from failure to replace the battery very soon. Consult the manufacturer's instructions for directions on replacing or charging the backup battery."
Warning: It is important to note that the back up battery in the MobilePro 900 is not rechargeable, thus, to prevent data loss, it is important to change the back up battery immediately when this message is displayed.
×