pgr2002
Member level 5
- Joined
- Aug 1, 2013
- Messages
- 87
- Helped
- 0
- Reputation
- 0
- Reaction score
- 0
- Trophy points
- 1,286
- Location
- Hyderabad, India
- Activity points
- 2,015
Where will you buy high quality 18650 cells? There many fake ones sold today.
An 18650 rated at only 1200mAh or higher than 3500mAh will be full of rice or you-know-what.
I took some used Name-Brand 18650 cells from an old laptop and replaced the garbage Ni-Cad cells in a portable vacuum cleaner and they work fine. I charge them overnight at a fairly low current.
Increased capacitor does not increase the current, instead it increases the run time before recharging is needed.
NICADS are successful consumer batteries because they're able to take abuse.
Li-Ion type require that you give careful attention to the range of operation you subject them to. To my understanding you must avoid charging or discharging them outside a certain voltage range. Cells from reputable manufacturers have built-in protective circuitry. There are corner-cutting manufacturers whose cells are substandard.
If you monitor voltage of your Nicads when running the drill, voltage drops 50 percent or so (in heavy use). Yet it doesn't harm them. Their bulk allows them to carry a few Amperes (C size or bigger). They heat up a bit in use or charging. It doesn't necessarily shorten their useful life.
Li-Ion are the type in news reports for causing fires and explosions.
To stay within their intended operating range I imagine you'll want 2+2 series-parallel. Keep track of their temperature during use and charging.
I will be using BMS for the li-ion cells to protect them from overcharging, etc
NICADS are successful consumer batteries because they're able to take abuse.
Your schematic shows a 3s BMS board but you need 2s board.
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?