Author Topic: how to jump charge this li-on tablet battery ???  (Read 4839 times)

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Offline administr4tor

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how to jump charge this li-on tablet battery ???
« on: November 19, 2015, 05:56:15 pm »
dEVICE- https://www.ifixit.com/Teardown/BlackBerry+PlayBook+Teardown/5265

Problem:- One discharged battery needs to be charged little bit with external dc power supply.

Background :-
This is a playbook battery, Blackberry playbook are the sh*t because once the battery goes below certain level of charge then the charging will never start unless you give charge from external power supply, so I forgot to charge this blackberry playbook and it got discharged and then i didnt  use it for months and now it wont even charge and turn on.

I manage to find another charged(SCREENSHOT) blackberry playbook battery from and found the pinouts and voltages but when I give external DC Power of 3.9V or 4.0V to *discharged battery* then NO CURRENT is flowing, which means that it is  not charging with external dc power supply,

so how can I charge this BAttery by external power supply?

I have tried all the  +  and  - supply from the pinout but no current is flowing from DC power supply to battery, I  have tried several volt ranges from 3.9v to 4.2v on  DISCHARGED BATTERY.

Usually I charge almost all tablet and phones batteries with external dc power supply but this  battery is a hard nut.

Thank  you



 

Offline administr4tor

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Re: how to jump charge this li-on tablet battery ???
« Reply #1 on: November 23, 2015, 06:57:33 pm »
no one??
 

Offline miguelvp

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Re: how to jump charge this li-on tablet battery ???
« Reply #2 on: November 23, 2015, 07:09:01 pm »
No idea, but a search on the interwebs pointed me to this:
https://supportforums.blackberry.com/t5/BlackBerry-PlayBook/Battery-0-and-does-not-charge-at-all/td-p/1682953

At least it fixed it for the person asking the question.

Edit: adding quote

Quote
If your battery is dead or near dead, you have a problem. If you follow these instructions you may be able to make a recovery but it will take some time. The charger is controlled by software. The software will not run because the battery voltage is too low. When the battery is too low and you turn on the PB, It will only run for about 4 minutes and then shut down again. During this 4 minutes, the charger will begin charging but since the battery voltage is still too low, the unit will shut down again and the charger will shut off. To get the voltage up sufficiently for the PB To continue, you have to have the charger plugged in and every 5 minutes or so, you have to hold the power button on until the red light flashes then release it.It will once again recharge for 4 minutes. You may have to repeat these steps at least 10 times. Once the voltage gets up a bit, the charger should stay on but it will takes 6 hours to fully recharge the battery. When your charger is charging, it will feel warm to the touch so check it often to see if it is in fact charging.

and PS
Quote
PS,
Make sure to keep it on the charger for 4 to 6 hours so it is fully charged.
Your welcome. Any other problems, the Community Forum is here to help those in need.

This is using the playbook charger it seems.

« Last Edit: November 23, 2015, 07:13:11 pm by miguelvp »
 

Offline KL27x

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Re: how to jump charge this li-on tablet battery ???
« Reply #3 on: November 23, 2015, 07:12:30 pm »
Where are you applying your power?
It looks to me like you ought to put your 4V source on the 2.73V terminal. Either one.

Until the voltage gets over 3.3V or so, you might want to limit current to 10-20mA.
 

Offline Howardlong

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Re: how to jump charge this li-on tablet battery ???
« Reply #4 on: November 23, 2015, 10:12:12 pm »
For my sins at one time I did some development on Playbooks, and one of its quirks was indeed that it apparently does die when the battery is very low. I say "apparently" because all that's needed are a nice dose of patience and a proper 1.5A USB DCP charger such as that supplied (the one supplied says it's 1.8A). A bog standard USB port or charger wouldn't ever work for me as far as I could ever tell once it'd got itself into a very low energy state.

You have to leave it for quite some time under charge, but eventually it will recover. I can't remember how long it was on charge the first time this happened to me, but I'd forgotten about it and had given it up as broken. Anyway, miraculously when I came by it again some time (possibly a day or two) later after being on charge, it booted up.

Now today I can't remember the last time I powered up my Playbook, it's many months, but I took the opportunity just now to power it up and charge it up, but coincidentally and ironically, sadly the magic smoke has just escaped out of the original Playbook charger, one of those sealed units with little chance of redemption without engaging a Dremmel, so it's now headed for landfill.

Despite those many months of doing nothing in a drawer (after that first time, I always fully switched it off rather than leaving it in standby) it started up without any need for charging after all, but I am now topping it up on a different DCP port at just shy of 1.5A anyway!
 

Offline amyk

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Re: how to jump charge this li-on tablet battery ???
« Reply #5 on: November 24, 2015, 04:55:17 am »
Note that lion cells should not be reused if they've gone below ~2V for any significant length of time, and 3V is a more comfortable safe minimum voltage for them.
 

Offline donkey77

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Re: how to jump charge this li-on tablet battery ???
« Reply #6 on: November 24, 2015, 07:19:47 am »
I've got a couple of these and have had the same problem. Forget the USB charge and get a portable fast charger (not the desk stand type), the magnetic holder one, this allows you to charge and use USB for data at the same time. Connect the the charger, leave for ten seconds, remove and repeat, maybe 50 or more times. Eventually enough power goes in that the charging circuit with control it.
Unfortunately no bugger really supported it and now even things like YouTube don't work properly but the screen is good and with 64 gb mine just get used for kids in car films.
 

Offline administr4tor

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Re: how to jump charge this li-on tablet battery ???
« Reply #7 on: December 04, 2015, 04:59:09 am »
Where are you applying your power?
It looks to me like you ought to put your 4V source on the 2.73V terminal. Either one.

Until the voltage gets over 3.3V or so, you might want to limit current to 10-20mA.

I have applied voltages between all + and -  pinouts of the battery.
 

Offline senso

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Re: how to jump charge this li-on tablet battery ???
« Reply #8 on: December 04, 2015, 09:33:45 am »
Remove the plastic, find the LiPo terminals, charge there, right into the battery, going from the outside you are still getting blocked by the protection circuitry, done that dozens of times in Asus tablets..
 


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