Quote:
Originally Posted by mark_in_manc
... 18650 [Lithium rechargeable cells] about 4v, would be close enough. 3 in parallel would last a good while - and they're free in a dead laptop battery near you  |
At the risk of going too far OT, I have indeed re-purposed several such cells and they can be excellent in high drain applications when properly managed. However they can pack a 35 amp punch, so need to be fused, and the charging regimen is critical to avoid danger. I wouldn’t personally use them in a low-drain application, although their self-discharge rate is very low.