Hi Everybody. I'm from Brazil. Not 100% english speaker.
I'm new to this forum and I'm not used to deal with electronics (though i know some basics) and I'm very concerned about the safety of some battery adaptation.
I have a Coby MP550 MP3 Player:
**broken link removed**
Since I've bought it, the battery always ran out after ~40 minutes of continuous playing. I decided to abandon it like 6 months ago. I tried it today in the morning and the battery was dead. I tried to charge it for 1 hour but it didn't charge at all.
I opened (broke) the case and noticed the battery was bloated, and had no voltage (according to the multimeter) so i took it off.
It is a GSP031525 80mAh 3.7V. According to Coby website, it is a Li-Pol unit. Here is a picture of it.
**broken link removed**
I took a "T828"'s (chinese multifunction mobile phone) battery, 1800mAh Li-Ion 3.7V and soldered to the MP550 board.
**broken link removed**
**broken link removed**
But, doing some research about it, I learnt that Lithium batteries need to be managed/monitored while charging and discharging. Both overcharging and fully-discharging are harmfull and can cause explosion, fire, leaking, shorting etc.
As you can see, the original MP550's battery doesn't seem to be a "smart batery". It looks like there's nothing like a circuit doing some kind of load management. I disassembled the plastic case of the T828's battery and found that it has only on a metallic block, having one spot being the (-) and the whole body being the (+). Disassembling beyond this would only expose the chemicals inside it. I mean, unlike the Playstation Portable battery, looks like there's no embedded circuitry on the MP550's or the T828's ones.
Can we assume that what will monitor/manage the load of these batteries have to be whatever charge or drain them?
The T828 wall charger has a indicator led that warns about the charging proccess. Red for charging, orange for half charged, green for fully charged, but, from now on, it's impossible to use it to charge the fankenstein MP3 player. It will have to be charged the default MP550's way (via USB).
I know these are very cheap devices (not worth all the efforts) but my concerns are only about the safety of using the T828's on MP550. Even having it working normally and playing for more than 8 hours continuously so far, I havent tried to charge it to it's fullest yet.
Can I trust that the MP550 board has the needed "things" to manage/monitor the 1800mAh T828? Would it act like it did with it's own battery, charging only to the safe limit and switching itself off before the battery is runs completely out?
The filnal work is this, with the new insulating-tape-"case" .
**broken link removed**
Thanx for any reply.
I'm new to this forum and I'm not used to deal with electronics (though i know some basics) and I'm very concerned about the safety of some battery adaptation.
I have a Coby MP550 MP3 Player:
**broken link removed**
Since I've bought it, the battery always ran out after ~40 minutes of continuous playing. I decided to abandon it like 6 months ago. I tried it today in the morning and the battery was dead. I tried to charge it for 1 hour but it didn't charge at all.
I opened (broke) the case and noticed the battery was bloated, and had no voltage (according to the multimeter) so i took it off.
It is a GSP031525 80mAh 3.7V. According to Coby website, it is a Li-Pol unit. Here is a picture of it.
**broken link removed**
I took a "T828"'s (chinese multifunction mobile phone) battery, 1800mAh Li-Ion 3.7V and soldered to the MP550 board.
**broken link removed**
**broken link removed**
But, doing some research about it, I learnt that Lithium batteries need to be managed/monitored while charging and discharging. Both overcharging and fully-discharging are harmfull and can cause explosion, fire, leaking, shorting etc.
As you can see, the original MP550's battery doesn't seem to be a "smart batery". It looks like there's nothing like a circuit doing some kind of load management. I disassembled the plastic case of the T828's battery and found that it has only on a metallic block, having one spot being the (-) and the whole body being the (+). Disassembling beyond this would only expose the chemicals inside it. I mean, unlike the Playstation Portable battery, looks like there's no embedded circuitry on the MP550's or the T828's ones.
Can we assume that what will monitor/manage the load of these batteries have to be whatever charge or drain them?
The T828 wall charger has a indicator led that warns about the charging proccess. Red for charging, orange for half charged, green for fully charged, but, from now on, it's impossible to use it to charge the fankenstein MP3 player. It will have to be charged the default MP550's way (via USB).
I know these are very cheap devices (not worth all the efforts) but my concerns are only about the safety of using the T828's on MP550. Even having it working normally and playing for more than 8 hours continuously so far, I havent tried to charge it to it's fullest yet.
Can I trust that the MP550 board has the needed "things" to manage/monitor the 1800mAh T828? Would it act like it did with it's own battery, charging only to the safe limit and switching itself off before the battery is runs completely out?
The filnal work is this, with the new insulating-tape-"case" .
**broken link removed**
Thanx for any reply.
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