| duuude | would it damage the phone if I wire to it a bigger mobile battery with similar voltage? | 10:39 |
|---|---|---|
| KotCzarny | nope | 10:56 |
| KotCzarny | there were folks that put 2x18650 on n900 | 10:56 |
| KotCzarny | you will have to transplant battery interface from the bl5j | 10:56 |
| duuude | KotCzarny: can't I just make the wire touch the battery's + and - contacts and phone's + and - contacts? | 10:59 |
| KotCzarny | can't find the thread on tmo | 11:03 |
| KotCzarny | but i think it isnt wise | 11:03 |
| duuude | the battery says don't disassemble | 11:04 |
| sixwheeledbeast | it's dangerous to disassemble if you dont know what your doing | 11:07 |
| Maxdamantus | I imagine it should be fine, the main thing I'd be concerned about is overcharging the battery. | 11:07 |
| sixwheeledbeast | thats why you need the charging chip in the battery | 11:08 |
| Maxdamantus | aiui BL5J has overcharging protection built in, but some batteries don't have it, or they might have bad overcharge protection. | 11:08 |
| duuude | the battery is from a newer phone than n900 | 11:08 |
| Maxdamantus | right, but it wouldn't need to specifically be the BL5J circuit. | 11:08 |
| duuude | good battery bad phone vs bad battery good phone | 11:09 |
| duuude | Maxdamantus: so it is fine? | 11:09 |
| Maxdamantus | I think especially in newer phones, the batteries won't have overcharge protection. | 11:09 |
| Maxdamantus | since I think newer phones have that as part of the phone, not as part of the battery. | 11:10 |
| joerg | "disassembling" battery is usually simple, just peel off the sticky tape. DO NOT try to disassemble, pierce or bend the silver color packaged LiIon cell inside | 11:10 |
| Maxdamantus | the simple answer to your question is that it won't damage the phone, but it might damage the battery (if you use the N900 to charge it). | 11:11 |
| sixwheeledbeast | you want the charging circuit so it doesn't explode in a flame ball of electrolyte | 11:11 |
| joerg | the battery needs to be a 3.7Vnom/4.2Vmax LiIon type | 11:12 |
| duuude | what about 3.8V | 11:12 |
| joerg | BL-5J is a "dumb" battery, it has PROT which you will want to keep but it has no "intelligence" like built-in BQ27200 | 11:13 |
| joerg | 3.7 vs 3.8 is a nomenclature thing, doesn't matter | 11:13 |
| joerg | 4.2V MAX is really important | 11:13 |
| joerg | and you NEED a PROT(ection) circuit | 11:14 |
| joerg | that cuts out when battery gets over/under-charged, overcurrent | 11:15 |
| joerg | short circuit | 11:16 |
| joerg | so get a cell that comes with such circuit, or ise the one in the BL-5J you disassemble | 11:16 |
| joerg | use* | 11:16 |
| joerg | >>there were folks that put 2x18650 on n900<< ONLY in 2P config! | 11:17 |
| joerg | honestly, a single 18650 would do as well | 11:18 |
| duuude | what is 2p config? | 11:18 |
| joerg | and *probably* you can't charge those monster battery contraptions before the N900 charger timeout kicks in, so you need to restart charging several times, it wil take a day maybe | 11:19 |
| joerg | 2 cells parallel = 2P. 2 cells in series = 8.4V max = 2S | 11:20 |
| joerg | connecting two cells in parallel has its own pitfalls, they need to be balanced (exactly same voltage) the moment you connect them in parallel | 11:22 |
| joerg | and they need to be *eactly* same type, brand, age etc | 11:22 |
| duuude | is the charger timeout in software? | 11:22 |
| joerg | iirc it's in charger chip hardware | 11:23 |
| joerg | I heat a distant echo shouting sth like "4 hours" | 11:23 |
| joerg | hear* | 11:23 |
| joerg | will restart though when you disconnect and reconnect the USB PSU | 11:24 |
| KotCzarny | joerg: 2 18650 is nice because its more stable when you put the tel on the table | 11:28 |
| Maxdamantus | Isn't balancing mostly important when they're in series? | 11:29 |
| Maxdamantus | Presumably if you're putting them in parallel, they will self-balance. You'd only really have an issue if the batteries are so far off that they charge/discharge too quickly. | 11:30 |
| joerg | :-) | 11:33 |
| joerg | http://neo900.org/stuff/block-diagrams/n900/n900.html | 11:36 |
| joerg | https://www.ti.com/lit/ds/symlink/bq24150a.pdf | 11:37 |
| joerg | "Datasheet" | 11:38 |
| joerg | >>A safety timer with reset control provides a safety backup for I2C interface<< | 11:39 |
| joerg | sorry, I didn't recall correctly, in N900 it's sort of software-assisted, the HW-timer is 32minutes: https://i.imgur.com/HfDCvxq.jpeg | 11:45 |
| duuude | joerg: how to separate the interface from the silver cell? | 12:06 |
| joerg | it's either on a separate tiny PCB and the cell tabs soldered to the PCB, or when it's integrated into the pouch cell bag then it gets very tricky and probably shouldn't get done at all | 12:07 |
| joerg | if the former, I suggest cutting the cell tabs from PCB with a sharp knife, scissors etc, then unsolder the tab stubs on PCB with the cell removed a sufficient distance | 12:08 |
| joerg | duuude: *ALWAYS* have a fire resistant surface to do such stuff with cells on it, and a bucket with sand or (for cells <5Wh) full of water, and never breathe the smoke from cells going thermonuclear | 12:11 |
| duuude | joerg: a full bl5j in a phone with broken usb shows low battery. however everything else seems to work. what is causing this? | 17:20 |
| KotCzarny | chip needs to learn | 17:21 |
| duuude | how much time is needed? | 17:21 |
| duuude | I'm using it for 7 minutes | 17:21 |
| KotCzarny | needs few full cycles | 17:22 |
| KotCzarny | but as long battery holds voltage ok you can ignore % | 17:26 |
| duuude | bluetooth doesn't remain on | 17:28 |
| duuude | kinda flickers | 17:28 |
| duuude | every few seconds | 17:29 |
| duuude | what could be causing this? | 17:32 |
| KotCzarny | physical damage? | 17:33 |
| duuude | it works btw | 17:33 |
| joerg | bluetooth has dropouts whenever unconnected but active WLAN scans for any WLAN AP to connect to | 17:40 |
| joerg | switch off WLAN, or connect to your AP | 17:41 |
| joerg | if that doesn't "fix the BT issue" then you got some more serious problem | 17:42 |
| joerg | (took me literally years to find out the reason for BT audio dropouts) | 17:44 |
| duuude | why did neo900 fail? | 18:16 |
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