Nominal voltage is 36v, fully charged is 42v. Ten 18650's is 42v at 2500mah. Put another ten 18650's in parallel with the first ten, hence twenty 18650's ..you get 42v at 5000mah or 5.0AH.
My mower came with a three-year warranty on the battery I’m sure after 2 1/2 years I’ll send it in or do whatever they ask me to do with it to receive a new one
@@bobspurloc yeah they technically didn’t lie. So long as maximum charge is at or above 40v when new then they can sell it as such. It’s just cheap and underhanded. Few companies do this. They typically use enough so the nominal voltage meets or exceeds designated rating. In this case most other brands would have used 11 series batteries. Most likely Panasonic or Sony for the 3500 mAh capacity for a better pack, but honestly Samsung is good too. I see why the reviews on Hart equipment are poor for long term usage and battery capability. I think I will modify my pack to use the higher capacity batteries that have a higher discharge rate. I’ve been building packs for years now and I have discovered capacity is not always key it’s the discharge rate. A battery back for a 1KW motor in lithium would generally be 20Ah at 35A max discharge. I used a battery pack made of Ford C-Max cells that were 5.5Ah and 200A discharge. I got nearly the exact same distance from both packs. The Panasonic and Sony 18650 cells can achieve 35A discharges so 2P would make 70A. These Samsung cells probably only have 20-25A rate each.
@@samfish90212 ah nice! good to hear. it's crazy how 18650's went from no where to everywhere. all my flashlights are 18650 now. I was just buying dead laptop batteries and just rip out the good ones for my electrical projects.
@@samfish90212 If only the world were so simple... In power tools a 40 volt is typically 10s, or 10 cells in series. That makes sense, since 20 volt power tools in pretty much every brand are 5s. Note Ryobi with their 18volt (also 5s) and Kobalt with their 24volt (6s). If 5s is 20v then 10s should be 40v, right? And then you get to EGO with their 56 volt which is 14s. Hey the math is consistent! But then you have a few that are 10s that do not call it 40volt, and that is enough to make the whole mess uncertain. Then if you go to the eBike world, they typically call a 14s 52 volt, and 48v is more common, which is a 13s. That math doesn't work at all. And some vendors sell a 12s as 48v (at least that math matches the power tools). But this isn't just a new thing that started with lithium-ion cells. That ubiquitous 12v car battery is a 6s, and the cells are actually 2.1v nominal when fully charged (giving you 12.6 volt) but you have to charge it to 14v or so (sometimes as high as 14.5v and equalize at 15v) which is 2.3-2.5 volt per cell, analogous to the li-ion 4.2vpc. If you go to a golf car and put 3 of those 12v batteries in series you get what is called 36 volt, or 4 in series you get 48 volt. Sometimes instead of 12 volt blocks you might use 6 volt "golf car batteries" or 8 volt batteries (3 cell and 4 cell, respectively) to get the same 18 cells for a 36v or 24 cells for 48v. But that 48v battery with 24 cells at 2.1 volt / cell fully charged is actually 50.4 volts, and to fully charge it to 2.3 volt per cell is actually 55.2v. A 48v lead acid battery matches usable voltage really well with a 14s lithium-ion battery like the EGO battery which is called 56volt or what the eBike world calls 52volt. It's enough to make your head spin when you try to work out between different manufacturers exactly what they are doing.
AH is Amp Hour. Not amps. The actual current draw is most likely different. So it most likely does draw more than 180 watts. But those are WH watt hours. They are a different kind of measurement than standard watts, amps and volts. The reason why you math doesn't add up is because you are using the wrong math for the values you are given. As for how many amps each cell can output is based on 2 things. The first being the capacity of each cell and also the max current output of each cell. These two values can be different. You can have a 3.5 AH battery and it can output 10 amps safely because they are 10 Amp cells. There are cells that are 3.5 AH and they can safely output 25 amps. And some that are less expensive output 8 amps but are 3.5 AH. They didn't put tape there because it is all insulated already with the plastic battery holders. So there is no need for it.
Just saw two 5ah hart battery packs clearances down to $77 at my local Walmart I have all greenworks equipment Including a 14” chainsaw that drains batteries quick Looking at the batteries in Walmart I was thinking they look very similar to greenworks after viewing your video I think they’re pretty much identical they probably just have some kind of plastic tab to prevent swapping between manufacturers. I had a 2.5ah battery that came with the chainsaw when I bought it used off of market place and died on me after using it twice. When I tore Into it to salvage the cells inside was a mess with corrosion from being left outside in the rain anyways they had the exact same cells as yours same size pack only half filled with cells where my 2ah pack is half the size
yeah I have a bunch of greenworks and hard 4ah/5am batteries now but not from buying them as singles but from buying actual equipment that was on clearance under $100 with the battery in there! lol
you mean volts not watts. but that isnt correct. the 18650's are 3.7 volt batteries. a fully charged one is 4.2 volts. the voltage drops as it drains and thus it lights less LED's to show the voltage has dropped
1:51 Conformal coating most likely. Corrosion protectant, rust is what kills most lawn and tool batteries and is why modern EV packs are being filled with foam. 4:00 Under-rating, likely for cell lifespan and to prevent battery fires and damage. 4:30 10S2P? Interesting, then these could be ran off used eBike packs.
is that powering off of 18650's?? hrmmm I could plug this into the Ideation GoPower Plus Emergency Portable Power Station it has a 12v source plug like that. ruclips.net/video/m7vDkJY383g/видео.html
its a T10 security bit aka torx 10 with the hole in middle. if you look at the screw head you see the pin in the middle. just knock that pin out. you can use a sharp nail to knock that center pin out or a drill starter punch to smack it a few times that will either knock it out or crush it.
My 40v battery reads 17.5 v but won’t recharge. Only had for a year. First try of this year and it won’t charge. Any ideas other than $170 for new one. Could it be the junk charger?
ah ok so battery is alerting something is wrong. about all you can do is contact Hart I believe as the battery has a 3 year warranty. did it get rained on? also beware any serial number discussions as hart batteries serial numbers dont tend to match the packaging. I have several videos clearly showing batteries new on the shelf at walmart dont match the packages serial number also they now sell 2 packs of the 20v 4amp with only 1 serial number on the package which of course cant possibly match the 2 batteries inside lol
dead ones on ebay... but then u dont know why its dead. I hear there is some reset procedure that possible can work that was for ryobi which is same thing. also desoldering that circuit board doesnt look like fun lol. what I would do though is check the voltages on the batteries. FULL voltage and each cell. depending what you find charge all teh batteries up to 4.2v'ish I think usually what those errors mean is the voltage is too low to charge. its not hard isolating 1 battery at a time to charge them if u pay attention to the metal rails they are attached to
@@bobspurloc My battery flashes all four lights. It measures at 24.4v so it isn't dead. I believe it just needs a reset, but I don't know the procedure for doing so. Upon opening the battery, there are two 3.3v and two reset contact points. Would you or anyone here know the procedure for resetting this battery?
@@davcar872 it's a 40v battery measuring at 24v. im not sure but that is way low. ide try and charge each battery manually to get the voltage higher. did it sit a long time? that voltage is bothersome because the battery is going to shut itself off before getting that low. and lithium dont drain that fast sitting so it seems possible a dead cell or 2. but who knows until each sell is tested
Good value? Samsung cells...thinking about these packs for my electric scooter. For 40v Ryobi and Greenworks and Harbor Freight and Kobalt are options but I like the compact size of the Hart pack.
They all seem to have the Samsung 2500's. It seems odd one would be smaller than the other knowing they all have 18650's in them. Only way to make them even smaller would be to use 5000mah batteries, but i'm not sure those "really" exist yet, meaning ignoring the China BS ones.
@@Ezekiel-OffRoad I havent seen a "REAL" 18650 greater than 2500 yet. walmart has several electronic devices stating 3350mah etc all are bogus chinese 18650. walmart just got sued for selling Onn portable batteries claiming the 18650's are greater than 3000mah. I just got a check for $120+ in that lawsuit LOL...
@@samfish90212 Nice yeah higher end batteries for power equipment etc... but if you see a claim over over 2500mah at the electronics area its almost certain chinese cheap lies. I jut received $130 in damages from a lawsuit against walmart and those ONN portable batteries claiming 3000mah 3500mah etc LOL...
@@michellelogan2124 well that would seem a bad battery. was it used in other equipment? how old is it? call HART yet? was the battery left outside in the rain?
It was about 2 months old originally with a new 5 added that was brand new. It is being replaced. I guess they di have a failure rate. Would be interesting to know if anyone else has any problems similar to this. Appreciate your time and response.
I dont know the size of my lawn but it takes 3 batteries to do because a big area is dense grass and I tend to mow 2 weeks apart. also I tend to have the drive at full speed the whole time. You cant drain a battery down till it cuts off and recharge it in an hour. u cant do that because the battery wont let you charge it until it cools down. if u were to stop using the battery just before it cut out u may be able to throw it on a quick charger. also of course putting it into a freeze etc would cool it down which of course will lead to extreme whining that will cause condensation in the battery etc etc etc u could open the battery and put a fan on it, that would cool it down faster which again brings on extreme whining of omg u can electrocute yourself etc stupid etc
@@bobspurloc yeah I bought the 20 volt mower. It took more than an hour for the batteries to cool enough to not be slightly concerning lol. Now I'm not sure if I should get the 40 volt. I live in a mobile home park. My yard isn't that big, but it went through both 20 volt 4Ah batteries really fast lol.
Can't believe Wally World is offering the Hart 6Ah battery for $218.99 right now. They are also offering the Hart 40v 18" push mower with 6.0AH battery and charger for same price right now. Go Figure??
Yeah, those are Samsung 25r. Very popular in the vape community. I'm glad to see Hart uses reputable cells and not no-name garbage cells
Nominal voltage is 36v, fully charged is 42v. Ten 18650's is 42v at 2500mah. Put another ten 18650's in parallel with the first ten, hence twenty 18650's ..you get 42v at 5000mah or 5.0AH.
Other 40v batteries have a reset jumper. Is there a reset on the hart 40v?
My mower came with a three-year warranty on the battery I’m sure after 2 1/2 years I’ll send it in or do whatever they ask me to do with it to receive a new one
Those are Samsung 25r 18650s. They are 4.2v cells, so 20 if them in parallel would be able to be rated at 40v
almost all 18650's clearly state on them 3.6v or 3.7v but charging voltage is 4.2v. but I note that in the video.
@@bobspurloc 42v fully charged, 37v nominal, 30v fully discharged.
@@bobspurloc yeah they technically didn’t lie. So long as maximum charge is at or above 40v when new then they can sell it as such. It’s just cheap and underhanded. Few companies do this. They typically use enough so the nominal voltage meets or exceeds designated rating. In this case most other brands would have used 11 series batteries. Most likely Panasonic or Sony for the 3500 mAh capacity for a better pack, but honestly Samsung is good too. I see why the reviews on Hart equipment are poor for long term usage and battery capability. I think I will modify my pack to use the higher capacity batteries that have a higher discharge rate. I’ve been building packs for years now and I have discovered capacity is not always key it’s the discharge rate. A battery back for a 1KW motor in lithium would generally be 20Ah at 35A max discharge. I used a battery pack made of Ford C-Max cells that were 5.5Ah and 200A discharge. I got nearly the exact same distance from both packs. The Panasonic and Sony 18650 cells can achieve 35A discharges so 2P would make 70A. These Samsung cells probably only have 20-25A rate each.
@@samfish90212 ah nice! good to hear. it's crazy how 18650's went from no where to everywhere. all my flashlights are 18650 now. I was just buying dead laptop batteries and just rip out the good ones for my electrical projects.
@@samfish90212 If only the world were so simple... In power tools a 40 volt is typically 10s, or 10 cells in series. That makes sense, since 20 volt power tools in pretty much every brand are 5s. Note Ryobi with their 18volt (also 5s) and Kobalt with their 24volt (6s). If 5s is 20v then 10s should be 40v, right? And then you get to EGO with their 56 volt which is 14s. Hey the math is consistent! But then you have a few that are 10s that do not call it 40volt, and that is enough to make the whole mess uncertain.
Then if you go to the eBike world, they typically call a 14s 52 volt, and 48v is more common, which is a 13s. That math doesn't work at all. And some vendors sell a 12s as 48v (at least that math matches the power tools).
But this isn't just a new thing that started with lithium-ion cells. That ubiquitous 12v car battery is a 6s, and the cells are actually 2.1v nominal when fully charged (giving you 12.6 volt) but you have to charge it to 14v or so (sometimes as high as 14.5v and equalize at 15v) which is 2.3-2.5 volt per cell, analogous to the li-ion 4.2vpc. If you go to a golf car and put 3 of those 12v batteries in series you get what is called 36 volt, or 4 in series you get 48 volt. Sometimes instead of 12 volt blocks you might use 6 volt "golf car batteries" or 8 volt batteries (3 cell and 4 cell, respectively) to get the same 18 cells for a 36v or 24 cells for 48v. But that 48v battery with 24 cells at 2.1 volt / cell fully charged is actually 50.4 volts, and to fully charge it to 2.3 volt per cell is actually 55.2v. A 48v lead acid battery matches usable voltage really well with a 14s lithium-ion battery like the EGO battery which is called 56volt or what the eBike world calls 52volt.
It's enough to make your head spin when you try to work out between different manufacturers exactly what they are doing.
AH is Amp Hour. Not amps. The actual current draw is most likely different. So it most likely does draw more than 180 watts. But those are WH watt hours. They are a different kind of measurement than standard watts, amps and volts. The reason why you math doesn't add up is because you are using the wrong math for the values you are given.
As for how many amps each cell can output is based on 2 things. The first being the capacity of each cell and also the max current output of each cell. These two values can be different. You can have a 3.5 AH battery and it can output 10 amps safely because they are 10 Amp cells. There are cells that are 3.5 AH and they can safely output 25 amps. And some that are less expensive output 8 amps but are 3.5 AH.
They didn't put tape there because it is all insulated already with the plastic battery holders. So there is no need for it.
Just saw two 5ah hart battery packs clearances down to $77 at my local Walmart I have all greenworks equipment Including a 14” chainsaw that drains batteries quick Looking at the batteries in Walmart I was thinking they look very similar to greenworks after viewing your video I think they’re pretty much identical they probably just have some kind of plastic tab to prevent swapping between manufacturers. I had a 2.5ah battery that came with the chainsaw when I bought it used off of market place and died on me after using it twice. When I tore Into it to salvage the cells inside was a mess with corrosion from being left outside in the rain anyways they had the exact same cells as yours same size pack only half filled with cells where my 2ah pack is half the size
Some walmarts are selling them now for 35. One had it for 17$
yeah I have a bunch of greenworks and hard 4ah/5am batteries now but not from buying them as singles but from buying actual equipment that was on clearance under $100 with the battery in there! lol
They really aren't 40 watts but 36. The 40 w is the no load voltage. 18 and 20 volt batteries are the same, just measure differently.
you mean volts not watts. but that isnt correct. the 18650's are 3.7 volt batteries. a fully charged one is 4.2 volts. the voltage drops as it drains and thus it lights less LED's to show the voltage has dropped
1:51 Conformal coating most likely. Corrosion protectant, rust is what kills most lawn and tool batteries and is why modern EV packs are being filled with foam.
4:00 Under-rating, likely for cell lifespan and to prevent battery fires and damage.
4:30 10S2P? Interesting, then these could be ran off used eBike packs.
Probably gonna rebuild mine with LG HG2 cells. 3Ah 20 Amps so effectively the same performance with 1 amp more runtime.
ah. $6 a battery? I see at battery junction. or $5.50 for 4+ what do u use to attach a wire to the battery?
@@bobspurloc gonna try building a spot welder. You can use a car battery and high current solenoid to make those welds.
Oh damn! nice. I see! ok this is going on my list as something to build also! LOL...
@@bobspurloc probably gonna try incorporating this. KKmoon Integrated Type Spot Welding Pen Automatic Trigger Weld Machine Accessory for 18650 Battery(Blue) www.amazon.com/dp/B085GF7PM7/ref=cm_sw_r_cp_api_glt_fabc_FMP1DR8E4WDJAWGNZXB6?_encoding=UTF8&psc=1
is that powering off of 18650's?? hrmmm I could plug this into the Ideation GoPower Plus Emergency Portable Power Station it has a 12v source plug like that. ruclips.net/video/m7vDkJY383g/видео.html
Good video overall. But wrong formulas. I did see what I needed to see though which was what the inside of the battery had in it.
20 cells with 2 parallel chains of 10. Looks like one to grab working or not from a garage sale or thrift store. 🤔
can u do a video on connecting the 40v hart battery to a 100 - 500-watt power inverter any size inverter that u recommend?
What bit size are you using to remove screws .I have tried several with no luck.
its a T10 security bit aka torx 10 with the hole in middle. if you look at the screw head you see the pin in the middle. just knock that pin out. you can use a sharp nail to knock that center pin out or a drill starter punch to smack it a few times that will either knock it out or crush it.
how to remove a security bit center pin lol... ruclips.net/video/iEAlK-bjyAo/видео.html
My 40v battery reads 17.5 v but won’t recharge. Only had for a year. First try of this year and it won’t charge. Any ideas other than $170 for new one. Could it be the junk charger?
the battery has 3 year warranty. does charger say its charging it? Lithium Ion dont usually just die
@@bobspurloc the charger is just double flashing the red light. The battery just flashes all 4 lights
ah ok so battery is alerting something is wrong. about all you can do is contact Hart I believe as the battery has a 3 year warranty. did it get rained on? also beware any serial number discussions as hart batteries serial numbers dont tend to match the packaging. I have several videos clearly showing batteries new on the shelf at walmart dont match the packages serial number also they now sell 2 packs of the 20v 4amp with only 1 serial number on the package which of course cant possibly match the 2 batteries inside lol
@@bobspurloc never been outside unless I had it in my hand using it. I don’t have the box it came in, that was last summer
@@bobspurloc I opened it up and don’t see anywhere to reset it. Tried the jump start thing different ways and nothing works
I want to get a 4Ah because I’m suspecting they might have higher discharge cells in them. 2Ah capacity but 30A discharge vs the 2.5Ah 20A of these
Probably only going to be 20A-22A cells, most likely the. INR18650-20R.
@@geoffstrickler feels more like 15A
Any idea where I can buy a replacement circuit board for this? I got flashing lights error. I am sure the cells are most likely perfectly fine.
dead ones on ebay... but then u dont know why its dead. I hear there is some reset procedure that possible can work that was for ryobi which is same thing. also desoldering that circuit board doesnt look like fun lol. what I would do though is check the voltages on the batteries. FULL voltage and each cell. depending what you find charge all teh batteries up to 4.2v'ish I think usually what those errors mean is the voltage is too low to charge. its not hard isolating 1 battery at a time to charge them if u pay attention to the metal rails they are attached to
@@bobspurloc My battery flashes all four lights. It measures at 24.4v so it isn't dead. I believe it just needs a reset, but I don't know the procedure for doing so. Upon opening the battery, there are two 3.3v and two reset contact points. Would you or anyone here know the procedure for resetting this battery?
@@davcar872 it's a 40v battery measuring at 24v. im not sure but that is way low. ide try and charge each battery manually to get the voltage higher. did it sit a long time? that voltage is bothersome because the battery is going to shut itself off before getting that low. and lithium dont drain that fast sitting so it seems possible a dead cell or 2. but who knows until each sell is tested
Anything I can do to save a Hart 40 v 4 ah battery that's flashing the four indicators blue?
I got the same issue... Call for warranty. They will mail you a new one.
My battery can't be removed from the mower. Any suggestions?
is it unclipping? did it melt in place??
Good value? Samsung cells...thinking about these packs for my electric scooter. For 40v Ryobi and Greenworks and Harbor Freight and Kobalt are options but I like the compact size of the Hart pack.
They all seem to have the Samsung 2500's. It seems odd one would be smaller than the other knowing they all have 18650's in them. Only way to make them even smaller would be to use 5000mah batteries, but i'm not sure those "really" exist yet, meaning ignoring the China BS ones.
From What I understand 3ah it’s about the highest you can get for power tools that require high current.
@@Ezekiel-OffRoad I havent seen a "REAL" 18650 greater than 2500 yet. walmart has several electronic devices stating 3350mah etc all are bogus chinese 18650. walmart just got sued for selling Onn portable batteries claiming the 18650's are greater than 3000mah. I just got a check for $120+ in that lawsuit LOL...
@@bobspurloc Panasonic produces a 3500mAhwith 35A discharge. I have a few and they hold up to the specs. Nice cells, too.
@@samfish90212 Nice yeah higher end batteries for power equipment etc... but if you see a claim over over 2500mah at the electronics area its almost certain chinese cheap lies. I jut received $130 in damages from a lawsuit against walmart and those ONN portable batteries claiming 3000mah 3500mah etc LOL...
Had a blower catch fire when I added 2nd 5 ah to other port. Is it possible battery is defective or is it something more that I'm missing?
you said blower caught fire. that isnt enough information to deduce a cause. where was the fire? blowers motor?
Battery caught fire .
@@michellelogan2124 well that would seem a bad battery. was it used in other equipment? how old is it? call HART yet? was the battery left outside in the rain?
It was about 2 months old originally with a new 5 added that was brand new. It is being replaced. I guess they di have a failure rate. Would be interesting to know if anyone else has any problems similar to this. Appreciate your time and response.
ah good to know. I have 10+ of these batteries most still in the boxes. first use?
Why are the lights flashing blue and chainsaw doesn't work
all lights flashing on battery? I think thats a bad battery? will it charge?
20v batteries go into 40v tools and vise versa?
no. but if you modified stuff they could.
@@bobspurloc if the rails are interchangeable I would love to break up a 40v and use higher cap batteries making a massive 20v pack.
@@samfish90212 I just realized I have 20v HART batteries now. I should check out the pins and rails
Do you know how long I can cut grass with these but I do know it takes an hour to charge them
I dont know the size of my lawn but it takes 3 batteries to do because a big area is dense grass and I tend to mow 2 weeks apart. also I tend to have the drive at full speed the whole time. You cant drain a battery down till it cuts off and recharge it in an hour. u cant do that because the battery wont let you charge it until it cools down. if u were to stop using the battery just before it cut out u may be able to throw it on a quick charger. also of course putting it into a freeze etc would cool it down which of course will lead to extreme whining that will cause condensation in the battery etc etc etc u could open the battery and put a fan on it, that would cool it down faster which again brings on extreme whining of omg u can electrocute yourself etc stupid etc
@@bobspurloc yeah I bought the 20 volt mower. It took more than an hour for the batteries to cool enough to not be slightly concerning lol. Now I'm not sure if I should get the 40 volt. I live in a mobile home park. My yard isn't that big, but it went through both 20 volt 4Ah batteries really fast lol.
Omg dude you are so lost
yeah im totally clueless. please go correct me in my 600+ other videos... dont forget to come back and admit u dont know jack compared to me.
is your battery still working.
I have quite a few batteries... I rotate 6 40v 5ah and 2 40v 6ah between mower and blower year round for years no issues
Can't believe Wally World is offering the Hart 6Ah battery for $218.99 right now. They are also offering the Hart 40v 18" push mower with 6.0AH battery and charger for same price right now. Go Figure??
its insane what they try to sell single batteries for. I bought clerance 21" self propelled aka top of line mower that comes with 2 6ah for $180...