The battery board is not turning the battery off because of the high current on load, or mosfet overheating. The battery protection circuit on the board is sensing a very high unaccetable voltage drop on one of your 18650 batteries and turning off your pack to save it firstly and the pack secondly. I say one battery, because the internal impedance of the batteries never match, one will always drop faster than the others. Basically your BMS board in your pack is working fine, protecting the pack from a poor battery or batteries that need replacing. Liked the video though, I tried before re-using laptop batteries for a nicd drill conversion with bms board and had poor results.I did similar tests to you and realised laptop batteries just can't supply the power required, cold cranking and under load.
If that's a 1P pack 18650 cell, how in the world is that putting out 70 amps?? I've been considering over volting (24v) my old brushed Ridgid OR trying to upgrade them to 21700 cells but I don't know what limits the current. If I use an old Hyper Volt (vs the new Max Output) and upgrade the cells, will it produce as much power as, say, the Ridgid 3AH 21700 octane pack that can push out 40 amp consistently? You're the only RUclipsr I found that even measured the amp output ;-P
I'm the only yourtuber that measured it probably because I was just curious. Mine is showing max under load before the BMS cuts it off with the over current protection. If your considering updating a Li-Ion pack for the stronger cells it will still be limited by that BMS (Battery management protection) circuit board. Using the existing BMS with batteries like the ones in the Octane packs could still be limited. Also I have an octane pack and I only see a difference on my brush-less hammer drill and 1/2 impact. If I use the octane pack with my brushed drills or 1/4 impact I don't see a difference because the motors are not capable of pulling that extra current from the octane battery. Side Note: The nickel strips on lithium packs are thick about 0.2 to 0.25mm thick and you would need a good spot welder for this. If you use thinner strips it wont be able to carry the current drawn and could heat up and burn under a constant load.
@@GadgetReviewVideos I saw somewhere else about using thicker metal strips as well! I assume the BMS is different for each type of battery (Regular vs Octane vs Max Output) so I would assume if I butchered the regular old Hyper Volt (or whatever the previous generation battery is) and upgraded to a Samsung 20/25R 18650 with a much higher discharge rate (20-30 amps per cell) that I might not reap the benefits if the BMS limits discharge? Or do you think it might be temperature limited?
@@DrKoser There are two factors. 1. The battery output current capability. 2. How much amperage the motor will pull. The BMS will still over current protect to prevent cell damage and is programed for the Hyper Volt cells used. Although the 20/25R cells are capable of putting out higher current, if the motor will never try to use that constant amperage then you wont see an improvement. The 25R cells are a constant 20 Amps in that series, but can do 100 Amps for less then a second. The BMS is programed for what ever the Hyper Volt cells max momentary surge of those batteries are. (I don't remember when they cut off in my video) When they make batteries to match the tools the manufactures also try to hit a balance between power/amperage for those motors, and run time. For example if the Hyper Volt cells are 10 Amp constant cells the also probably have a higher capacity/run time when compared to the 20/25R cells. The 20/25R cells can put out more constant current but will have less capacity/run time. This is why they have moved to the larger cells like the 21700 for more capacity so it doesn't affect the run time.
It’s the shunt conversion. This is the on,y shunt I own that can handle up to 30 amps without impeding the current. Every one milivolt on the meter is equal to one amp of current through the shunt.
Finally someone tested it properly! Thank you. It would be nice also to see how many amps it uses while drilling a real brick.
The battery board is not turning the battery off because of the high current on load, or mosfet overheating.
The battery protection circuit on the board is sensing a very high unaccetable voltage drop on one of your 18650 batteries and turning off your pack to save it firstly and the pack secondly. I say one battery, because the internal impedance of the batteries never match, one will always drop faster than the others.
Basically your BMS board in your pack is working fine, protecting the pack from a poor battery or batteries that need replacing.
Liked the video though, I tried before re-using laptop batteries for a nicd drill conversion with bms board and had poor results.I did similar tests to you and realised laptop batteries just can't supply the power required, cold cranking and under load.
Always amazing how much power you can pull from 18650s.
But poor lil' Agilent shunt 😨 🙂
I know. I will have to run it through the pace of high and low to see if its still accurate. I think it will be Ok, I hope.
Them brushed motor tools pull soooo much power compared to a brushless motor which would just stall out on overload protection
If that's a 1P pack 18650 cell, how in the world is that putting out 70 amps?? I've been considering over volting (24v) my old brushed Ridgid OR trying to upgrade them to 21700 cells but I don't know what limits the current. If I use an old Hyper Volt (vs the new Max Output) and upgrade the cells, will it produce as much power as, say, the Ridgid 3AH 21700 octane pack that can push out 40 amp consistently? You're the only RUclipsr I found that even measured the amp output ;-P
I'm the only yourtuber that measured it probably because I was just curious. Mine is showing max under load before the BMS cuts it off with the over current protection. If your considering updating a Li-Ion pack for the stronger cells it will still be limited by that BMS (Battery management protection) circuit board. Using the existing BMS with batteries like the ones in the Octane packs could still be limited. Also I have an octane pack and I only see a difference on my brush-less hammer drill and 1/2 impact. If I use the octane pack with my brushed drills or 1/4 impact I don't see a difference because the motors are not capable of pulling that extra current from the octane battery.
Side Note: The nickel strips on lithium packs are thick about 0.2 to 0.25mm thick and you would need a good spot welder for this. If you use thinner strips it wont be able to carry the current drawn and could heat up and burn under a constant load.
@@GadgetReviewVideos I saw somewhere else about using thicker metal strips as well! I assume the BMS is different for each type of battery (Regular vs Octane vs Max Output) so I would assume if I butchered the regular old Hyper Volt (or whatever the previous generation battery is) and upgraded to a Samsung 20/25R 18650 with a much higher discharge rate (20-30 amps per cell) that I might not reap the benefits if the BMS limits discharge? Or do you think it might be temperature limited?
@@DrKoser There are two factors. 1. The battery output current capability. 2. How much amperage the motor will pull.
The BMS will still over current protect to prevent cell damage and is programed for the Hyper Volt cells used. Although the 20/25R cells are capable of putting out higher current, if the motor will never try to use that constant amperage then you wont see an improvement.
The 25R cells are a constant 20 Amps in that series, but can do 100 Amps for less then a second. The BMS is programed for what ever the Hyper Volt cells max momentary surge of those batteries are. (I don't remember when they cut off in my video)
When they make batteries to match the tools the manufactures also try to hit a balance between power/amperage for those motors, and run time. For example if the Hyper Volt cells are 10 Amp constant cells the also probably have a higher capacity/run time when compared to the 20/25R cells. The 20/25R cells can put out more constant current but will have less capacity/run time.
This is why they have moved to the larger cells like the 21700 for more capacity so it doesn't affect the run time.
@@GadgetReviewVideos You, sir, are a gentleman and a scholar! Thank you for the explanation!
@@DrKoser No problem
Guy, the first half of the video, you're reading voltage......
It’s the shunt conversion. This is the on,y shunt I own that can handle up to 30 amps without impeding the current. Every one milivolt on the meter is equal to one amp of current through the shunt.