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Hey guys I came over the handheld console modding world and thought I'd dip my hand into tablet modding. I disassembled my m001 and removed the battery from it. I noticed that it's a 1600 mah 7.4v Li-Pol battery and after checking my personal collection of batteries I found a 3600 mah 7.4 Li-Ion external battery taken from a portal dvd player. The new battery has a limiting board. I was thinking two alternative wiring methods:1.Remove the stock battery and wire the secondary battery in. I'm not too sure if I can interchange a Li-Pol with a Li-Ion so if anyone has any input please post. 2.keep the stock battery and wire the secondary battery in parallel. With both boards having separate limiting boards, I don't see a risk of overcharging the battery but if anyone has something different to say please post.
 

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I think choice 1 would be better as your battery already has some current/voltage regulators to handle charging.I'm unsure on the 2nd choice cos the 2nd battery pack would start charging the first one (the first one doesnt have regulators if I'm not mistaken) and discharging itself. The first (main) battery pack would discharge faster then get recharged by the secondary.I think just the big one would be nice. Got pics? Or any measurements?
 

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[quote author=hoang031 link=topic=338.msg2885#msg2885 date=1275069437]Hey guys I came over the handheld console modding world and thought I'd dip my hand into tablet modding. I disassembled my m001 and removed the battery from it. I noticed that it's a 1600 mah 7.4v Li-Pol battery and after checking my personal collection of batteries I found a 3600 mah 7.4 Li-Ion external battery taken from a portal dvd player. The new battery has a limiting board. I was thinking two alternative wiring methods:1.Remove the stock battery and wire the secondary battery in. I'm not too sure if I can interchange a Li-Pol with a Li-Ion so if anyone has any input please post. 2.keep the stock battery and wire the secondary battery in parallel. With both boards having separate limiting boards, I don't see a risk of overcharging the battery but if anyone has something different to say please post. [/quote]1. Yes, charging voltages are the same and that's what matters. Having a protected circuit is great!2. Noooooooo, all cells have to be the same - and even then they can get unbalanced and cause fire.
 

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the battery in it is supposidly a lithium polymer, ive found several lipo batteries, but the odds of these batteries catching fire because theyre mad at you is too high to risk, but replacing it with a lithium ion battery is difficult since you must have a balance board in it to ensure the voltage is the same, or again, risk fire
 

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After folowing few thread on 1src last year about LI-ion batteries replace in somne palm devices I came accros a fact that there is no way a battery can get fire or explode even if you overcharge or without protect circuit.There is more than 50 pages about the subject.The circuit is present to folow rules and norms.I myself tried many times taking off the protect circuit and nothing hapend,the battery wont charge anymore than it can.I double the voltage that was 3.7 and nothing hapend.The only way to have the battery overheat is to connect directly + and - when it is completely charge.Now this is not for Li-Poly but it should be the sameJust my toughts
 

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The Eken uses pouch cells. These are almost certainly Li-poly cells, as Li-ion cells need a hard container. Most replacement packs I've seen used are also pouch cells, thus li-polyFires and explosions, are definitely possible, yes. And that protection circuit is important. Here is just a small sampling of examples, and from only one R/C website. There are many other references on this site besides these, and many other R/C sites:http://www.rcgroups.com/forums/showthread.php?t=1201043http://www.rcgroups.com/forums/showthread.php?t=883038http://www.rcgroups.com/forums/showthread.php?t=739810http://www.rcgroups.com/forums/showthread.php?t=205786http://www.rcgroups.com/forums/showthread.php?t=220777&page=7EDIT: here's another one:http://www.rcgroups.com/forums/showthread.php?t=220777I also think that paralleling different capacity and brand li-poly cells is a bad idea. Even series packs using identical cells should probably have a balance charger. These things are not Duracell AA's, folks.
 

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