| 28 Jul 2023 |
 Daniel | In reply to @rd2:matrix.org
I am trying to get a battery bms that suits the logic board to evade having to install a buck converter Typically a bms won't regulate voltage, it only controls charging and maybe has a current limit | 13:39:42 |
 rd2 | I am trying to rely on bmp that has suitable overchange and undercharge protection | 13:40:19 |
| Daniel | Batteries do not have an inherently stable voltage | 13:40:37 |
| Daniel | You will need a regulator somewhere | 13:40:48 |
| Daniel | Unless your circuit can tolerate a voltage swing of a few volts | 13:41:09 |
| rd2 | there are these smart bmses that you can enter values via software so you can control the protection range | 13:41:22 |
| Daniel | That only controls the max/min voltage of the pack | 13:41:42 |
| Daniel | Which dramatically reduces capacity | 13:41:52 |
| rd2 | even you can control current | 13:42:07 |
| Daniel | For example if you run a 3s lipo pack from 12.6-12.0v you're using only 20% of capacity | 13:43:02 |
| Daniel | In reply to @rd2:matrix.org
even you can control current Only a cutout typically | 13:43:11 |
| rd2 | 4s1p is 12.8V nominal this is better | 13:44:45 |
| rd2 | I like lfp pouches because they utilize space better but I could not find a pack of 12.8V 20A with good mechanical and bms protection | 13:46:24 |
| Daniel | What chemistry? | 13:46:27 |
| rd2 | lfp | 13:46:41 |
| Daniel | LiFePo4? | 13:46:58 |
| rd2 | yes | 13:47:03 |
| Daniel | Ah ok | 13:47:34 |
| rd2 | I guess I am getting close every day. thank you for your support | 13:48:21 |
| rd2 | * I guess I am getting closer every day. thank you for your support | 13:48:33 |
| Daniel | So 12.8-12.0v gets you 10% | 13:49:45 |
| Daniel | You can search something like "lifepo4 voltage charge chart" to get an idea | 13:50:33 |
| Daniel | In reply to @rd2:matrix.org
I guess I am getting close every day. thank you for your support I really think you should just use a buck regulator, they're cheap and efficient and it's how basically all battery powered computers work | 13:51:19 |
| rd2 | so these laptop batteries rely on a regulator? | 13:53:18 |
| rd2 | swapable batteries | 13:53:44 |
| Daniel | Yes | 13:54:05 |
| rd2 | also I have discovered that the fan of mac mini m2 pro do not run until the processor temp pass 100c | 13:55:01 |
| Daniel | Wow | 13:55:16 |
| rd2 | * also I have discovered that the fan of mac mini m2 pro do not run until the processor temp passes 100c | 13:55:20 |
| Daniel | That's pretty hot | 13:55:20 |
