T-Mobile MDA Compact Backup Battery Drained

[Guest ringp3ace]

Hi,

This is my first post, so please be gentle.

I've just got a T-Mobile MDA Compact a week ago.

Yesterday, both batteries were fully charged on the Laptop USB link cable.

I unplugged the phone to drive home.

About 3 hours later, when I looked at the phone, the screen was dead, and I couldn't switch the phone on.

When I got home, I plugged it in using the travel charger. It booted up OK, but of course lost all my settings. Anyway, I have a look at the Battery screen

Start > Settings > Power.

The Main Battery (Li-ion) was showing 98%

The Backup Battery (NiMH) was showing 0%

What is the difference between these batteries in term of what they do?

What would have been the likely cause of the Backup Battery draining like that?

Thanks, Yan

[Guest Xenzo1990]

I'de guess that the when the main battery is at 0% the phone switches off and uses backup to save settings etc.? Im not sure, ide like to know aswell.

[Guest Kermit75]

The manual says something about the backup battery should only really get used when changing main batteries, but could also get used as part of the Mobile/Call function (and not the PDA), when main battery is out.

However with a new battery (if left on stand-by) you should get a couple of days (ish), unless your journey home was 3 hours of talking it should drain that much.

Also for the charging information to say the backup is at 0%, and the main is almost full would indicate to me that the backup battery is faulty - suggest mentioning it to the company you got it from.

[Guest Xenzo1990]

Yes, but he charged his battery then found backup was 0%. Still. Shouldn't backup charge aswell?