You asked,
Can you rebuild this pack with larger capacity cells, yet retain the BMS and mounting point so I can still be attached to the weed eater as well as the factory charger?
My Answer,
Interesting question.
If you have a M18 XC battery the capacity should be rated at 2.8ah. The ratings are not linear and to acheive listed capacity you have to fudge the numbers. Nevertheless the output is what it is regardless at how you play with it.
Your battery has a double stack, or (10) ten cells rated at 1.4ah giving you a total of 2.8ah. If we can find a good cell of 3.0ah rated output you could conceivably increase your run time by 100%. But in the real world with pack losses in multiple bus connections, ambient and operation temperature, tool condition, fudge factors, etc, the mathematically reality is lost.
The answer to your question is, Yes we can increase the capacity by changing the cells.
The questions I have is; Will the circuit board take the extra heat without shutting down the pack, as they are designed to do, and would that cause you a problem to let the pack cool down, or could we install a fan as some high voltage batteries have to help it cool.
The last question I have is, how much would you want to spend? I love doing these things but there are always consequences that have to be understood. It is similar to our racing program where we had to ask, How fast do we want to go and how much do we have to spend? We called it "Cubic Dollars".
Keep in touch, I would love to work with you.
Thank you,
Ernie
If you have a M18 XC battery the capacity should be rated at 2.8ah. The ratings are not linear and to acheive listed capacity you have to fudge the numbers. Nevertheless the output is what it is regardless at how you play with it.
Your battery has a double stack, or (10) ten cells rated at 1.4ah giving you a total of 2.8ah. If we can find a good cell of 3.0ah rated output you could conceivably increase your run time by 100%. But in the real world with pack losses in multiple bus connections, ambient and operation temperature, tool condition, fudge factors, etc, the mathematically reality is lost.
The answer to your question is, Yes we can increase the capacity by changing the cells.
The questions I have is; Will the circuit board take the extra heat without shutting down the pack, as they are designed to do, and would that cause you a problem to let the pack cool down, or could we install a fan as some high voltage batteries have to help it cool.
The last question I have is, how much would you want to spend? I love doing these things but there are always consequences that have to be understood. It is similar to our racing program where we had to ask, How fast do we want to go and how much do we have to spend? We called it "Cubic Dollars".
Keep in touch, I would love to work with you.
Thank you,
Ernie
