| ??? 03/07/07 20:43 Read: times |
#134543 - Battery Life Responding to: ???'s previous message |
Battery Life in milliamp hours is usually specified at C/5. in this case 1700/5 = 340ma. At lower rates the battery provides more mAhrs, at hight rates less. If you are using a switching regulator the calculations are different. The device draws more current as the voltage falls. In this case the watt hour rating is what you need.
Be sure to include low voltage shutdown for the battery. They do not like to be broght to 0 volts. Remember to add capacity for wear. Batteries lose a little capacity with each charge/ discharge cycle. Adding 20% seems to be typical. |
| Topic | Author | Date |
| Calculate battery lifetime | 01/01/70 00:00 | |
| Well .. | 01/01/70 00:00 | |
| calculator | 01/01/70 00:00 | |
| Calculation | 01/01/70 00:00 | |
| Aging | 01/01/70 00:00 | |
| use a buck-boost | 01/01/70 00:00 | |
| Sucking dry | 01/01/70 00:00 | |
| depends on battery type | 01/01/70 00:00 | |
| what's a buck boost? | 01/01/70 00:00 | |
| a Buck/Boost is a switcher that will make the outp | 01/01/70 00:00 | |
| Battery Life | 01/01/70 00:00 | |
| Very simple! | 01/01/70 00:00 | |
| Remember, though: | 01/01/70 00:00 | |
| So what? | 01/01/70 00:00 | |
| 1.2V | 01/01/70 00:00 | |
| Ah sorry. | 01/01/70 00:00 | |
| Confusing the numbers... | 01/01/70 00:00 | |
| Lithium Ion | 01/01/70 00:00 | |
| and 3.7V | 01/01/70 00:00 | |
| Not for beginner | 01/01/70 00:00 | |
| combine AA & AAA | 01/01/70 00:00 | |
| So, you intend to use NiCd? | 01/01/70 00:00 | |
| Not a good Idea | 01/01/70 00:00 | |
Minimum capacitiy per cell must be 1300mAh! | 01/01/70 00:00 |