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Mugen Battery Revival?
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Old 12/23/2012, 08:47 PM   #1 (permalink)
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I bought a used Pre 3 off ebay, it came with a stock battery and a Mugen. When I powered it up with the Mugen, it showed 98% charge. I wanted to fully charge it to use as a backup for my main Pre 3, but when I swapped the Mugen into the main Pre 3, it wouldn't power on. Connecting it to the charger got the ? icon. I tried it again in the newly acquired Pre 3, same result. I don't have the receipt, and would guess it's over 30 days-any tricks to get the battery functional or is this now useless? I have another Mugen and two stock batteries, but it never hurts to have another!
TIA
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Old 12/30/2012, 08:42 PM   #2 (permalink)
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Quote:
Originally Posted by broncot View Post
I bought a used Pre 3 off ebay, it came with a stock battery and a Mugen. When I powered it up with the Mugen, it showed 98% charge. I wanted to fully charge it to use as a backup for my main Pre 3, but when I swapped the Mugen into the main Pre 3, it wouldn't power on. Connecting it to the charger got the ? icon. I tried it again in the newly acquired Pre 3, same result. I don't have the receipt, and would guess it's over 30 days-any tricks to get the battery functional or is this now useless? I have another Mugen and two stock batteries, but it never hurts to have another!
TIA
Try to send email to Mugen. Maybe they know of a reset option.

If battery is totally depleted, it can take some time before it start charging. Just leave it on the loader for a few hours or so. I believe there is also a Touchpad (battery) reviving thread on this forum, maybe they have some useful tips which can also be used for pre3.

Just some thoughts
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Old 12/31/2012, 12:09 PM   #3 (permalink)
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There is this thread as well...

http://forums.webosnation.com/webos-...ry-health.html

The HP devices differ from the Palm ones in terms of how battery is treated in some major aspects...
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Old 12/31/2012, 01:19 PM   #4 (permalink)
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I left the battery in my backup Pre 3 overnight and it charged/powered on. Dr Battery shows it has life of 1525 with a manufacturer rating of 1556. Pretty good for a 1400 mAh battery! I put calibration on (I know it won't calibrate, just to discharge), it shut off the Pre at 19%. Obviously, it's off! At least its working, good to have spares.
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Old 12/31/2012, 01:23 PM   #5 (permalink)
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Watch that overcharge... could be a sign the regulator chip in the battery is faulty.

That might be the root cause of the original problem. Monitor for sudden shutdowns and unexplained charge % drops...

It's a shame it is a used Mugen because for original purchase you would have a warranty. If the battery (chip) is defective you might try querying them anyway about replacement.
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Old 12/31/2012, 04:43 PM   #6 (permalink)
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I contacted Mugen, I'll let you know what they say.
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Old 01/19/2013, 04:12 PM   #7 (permalink)
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I have the same Mugen Power 1400 mAh battery.
Dr. battery shows 100% battery health: manufacturer rating 1556 mAh,calculated left 1556 mAh.
The battery lasts longer than the original one (more than day with Wi-Fi / GPRS always on). Of course I've done 5 cycles for battery full re-charging (as Mugen insists).
But there is an issue. It drains faster from 100% to 80% than after. On 0% it still works about 2 hours! So the proper calibration is needed but can't find the way to do it
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