mammonista
10 W
- Joined
- May 27, 2018
- Messages
- 82
Okay so this is probably a dumb idea and anyone who tells me that?... well, thanks in advance for the warning! :thumb: :thumb: :thumb:
A couple of years ago when I started down the e-bike path for some dumb reason I bought a couple of 'monster' 20ah 48v LiFe battery packs from China. I had a couple of fat tire bikes I was building for my gf and myself. Her bike is a front hub motor Mongoose and mine is a Cyclone 3k mid-drive powered Gravity Monster. After a few, infrequent trips on the coastal dunes here in Oregon I've pretty much got most of the bugs worked out of my mid-drive Gravity. With a 3-speed IGH Shimano Nexus this thing has tremendous torque and is able to leap tall buildings in 'low' and cruise all day long at 25mph in 'high'. If there's a weak point in the bike though it's that ginormous battery pack that is strapped to a cheap rack suspended from the seat post. That battery adds 25lbs. to the Gravity's 60lbs. for a total of 85lbs. ! Not a big deal with cruising up and down the beach, but a very big deal when trying to climb a dune on an angle. So I would dearly love to take the battery apart, buy a few extra cells, and custom build a 72-volt battery pack with say 12ah of capacity that would fit above the motor inside the frame...or I could just buy another from China.
But if I do that, then I have a 'spare' battery pack that I can't imagine I have a need for.
So just how difficult would it be to take that big pack apart? 'Unsolder' all the connections? And reconfigure my existing cells into a 72-volt pack? I've only used this pack a half dozen times so it's essentially new...
A couple of years ago when I started down the e-bike path for some dumb reason I bought a couple of 'monster' 20ah 48v LiFe battery packs from China. I had a couple of fat tire bikes I was building for my gf and myself. Her bike is a front hub motor Mongoose and mine is a Cyclone 3k mid-drive powered Gravity Monster. After a few, infrequent trips on the coastal dunes here in Oregon I've pretty much got most of the bugs worked out of my mid-drive Gravity. With a 3-speed IGH Shimano Nexus this thing has tremendous torque and is able to leap tall buildings in 'low' and cruise all day long at 25mph in 'high'. If there's a weak point in the bike though it's that ginormous battery pack that is strapped to a cheap rack suspended from the seat post. That battery adds 25lbs. to the Gravity's 60lbs. for a total of 85lbs. ! Not a big deal with cruising up and down the beach, but a very big deal when trying to climb a dune on an angle. So I would dearly love to take the battery apart, buy a few extra cells, and custom build a 72-volt battery pack with say 12ah of capacity that would fit above the motor inside the frame...or I could just buy another from China.
But if I do that, then I have a 'spare' battery pack that I can't imagine I have a need for.
So just how difficult would it be to take that big pack apart? 'Unsolder' all the connections? And reconfigure my existing cells into a 72-volt pack? I've only used this pack a half dozen times so it's essentially new...