BOSCH DRILL BATTERY POWERED EBIKE - LONG TERM TEST RESULTS
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- เผยแพร่เมื่อ 6 ก.พ. 2025
- So as some of you will know I have been using the Bosch 36V 6Ah coolpacks on my high power ebike build for a while now (nearly a year infact) they are still going strong but I wanted to find out if they had lost any capacity considering I have been pushing them to the limit!
Here's the results!
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No idea why I enjoy watching these so much because I only ever understand about 10% of it.
Haha! How did you end up here? I’m trying to make it as accessible as possible as I know there’s lots of different viewers watching. Stay tuned😉
Started watching because of the Twizy stuff then started watching the other stuff. I have discovered that I'll be getting a professional to fit the car charger because I'd burn the house down so you've saved me a fortune in the long run.
I converted all of my e-bikes and electric drift trikes to run on Dewalt cordless tool batteries. The main reason I switched was to keep my batteries from freezing during the winter. I did not know how bad cold temperatures are for lithium batteries, and the place where I keep my e-bikes gets below freezing for a few months. The cordless tool batteries are much easier to remove then a single large capacity battery. Additionally the Dewalt battery chargers won't charge a battery that is too cold or too hot, which can damage the lithium cells. Another reason I switched was because shipping large lithium packs is a nightmare in the US. You cannot travel on an airplane with a giant e-bike battery, but passengers are allowed to have a carry on bag full of the smaller cordless tool batteries (up to 100 watt hours per battery). Interesting note, the largest cordless tool battery I have is a 160 Wh 18V 9.0 Ah too big to travel with, but the label says when shipping it is actually a 3 x 60 Wh. One last reason is the tool batteries are built tough. I damaged a large e-bike battery once just trying to install it on the bike. Whereas I've dropped the tool batteries countless times and they work fine.
Ive been thinking about using drill batterys due to cost and they come already built
Missed this channel, not been watching for a while due to relocating to cheshire from the new forrest but back watching again now.
Very interesting
Nice to have you back!
I have a Bosch green 36v garden battery that’s metering at 30v and won’t charge anymore (I left it in the sun) any idea what can go wrong? Do these batteries have a bms? The fuse is good.
Data sheet on some cells discharge down to 2.8 volt to get the full capacity accurately
Yeah that’s a good point
currently building a range extender for my scooters 36v 5a battery using 2 of those batteries
I have had 7 batteries gone wrong on my Nano E bike the batteries were all new and failed to charge after being use for one green light discharge, this was the second charging after fitting. all replaced but still doing it. it is a 250 watt motor and used lightly. the batteries have power still got two lights up, but the charger red light comes on without any temperature problems. It has four connections on my 36-volt drill and two for the bike, it must be some sort of balance for output and charge. Anybody got any ideas about it , I have a drill and the battery on that has no problems YET and it has never been near the bike.
Just an idea, would you be able to do a series on an electric scooter, obviously a diy insane version, maybe something a bit like the cityrover s5 but better power/range?
The bms would not let it fully charge and fully discharge
i have a 6 cell pack of ax powertool batt ^^ out of rated 12 ah with 4 new 1 thats 6 mount old and one thats 1.5yr old i get 10.75 ah and 390watt hour and 33km at full speed on the escooter here is usefull range ^^
Warranty and a cool option for those who cant find a full size pack. I bet the drill packs are built for some abuse too.
Yeah I think so too.
ple of points - is the specified capacity rated at 2 amp discharge - might be at a lower figure, you could always repeat for one battery at 1 amp to see if that gets closer to 6ah. My other point is that, given how much these cost, I would not personally want to take them to 3v/cell unless I was monitoring at a cell level. Must admit I was a bit surprised that they had no built-in bms as the £12 5 cell 2am batteries Lidl sell do have this feature - the internal pcb connects to 6 points so each cell is monitored.
Hi, the technically speaking the cells are monitored internally, there’s quite a complex PCB inside which looks like a balancer to me. It only works when you connect one to its dedicated charger or a tool. If i could find out how to communicate with it then you could have some sort of alarm if one cells gets low.
What is the point of discharging
Testing the capacity
does the voltage regulator before the bms help to keep things in shape you do look after batteries as you should so service life should be long lasting as youve kinda proved . i mean if you max settings or go below lowest rated cell draw then trouble so i can see there dam good batteries an yeah bikes fast enough ,, have you still got the samsong 18650,s pak from jimmy was it ..? again nice trustworthy pack pays dividend, Nice one Andy thanx ,, what about 2 motorized husb set might be a tad OTT it would be NUTS in FACT dont try this anyone not advised tangent ,sorry
What's the top speed and range on the ebike?
What kind of range can you get on your e bike for just one 36v tool battery pack?
Mine won’t run on a single drill pack but if you had a 36v setup you might get 10-15 miles.
@@andykirby that sounds about the same as the specs claim for the actual ebike batteries. About 30 miles for ~12 amps.
Yes it would be about the same. If you can find cheap drill batteries it might be worth it.
Is this on a 250w or higher Andy...building one at the moment with 40v 2.5 ah 4 together. I'm using a 500w 36v
hey Andy , So which battery is best
well, that is a question! for high powered ebikes, a battery made of Samsung INR18650-30Q cells is probably where it's at right now as far as price/performance goes. There are cheaper cells out there but you need to be really careful they are what they say they are.
Hi Andy. The batteries should always cut off at the same voltage set by the internal BMS. It's the discharge time that indicates capacity. Keep up the videos - the Airforce One was cool.
Hi Brian, there’s no BMS in line with the main terminals of these batteries. It’s just an active monitoring and balancing circuit. Glad you like the videos!
Are you sure? I don't think that would be safe as a consumer product the drills or power tools mostly don't have protection they rely on the batteries
Yep 100% certain, I’ve taken them apart and the main terminals are connected directly to the main positive and negative of the cells. There is however a fuse inline. The tool or charger monitors the battery I think by the third battery terminal...and if anything weird happens it will shut off the tool or the charger (for example if one cell reaches a lower voltage or higher voltage than the others)
is it a fuse or is it some sort of relay ? waths strange on ma axpower batery is if i leave the escooter pluged i have one battery that disconect his cells but keep able to close the 2s circuit and so i see weird voltage ! watt meeter show 17 volt, i unplug one battery and replug and magic voltage is 40volt XD do u have any idea of how it can happen? @@andykirby
Andy I think the capacity on those batteries are calculated down to 2.5v per cell.
Yeah I think your right you know.
Bit of a pain to have to remove the batteries from the bike for charging, I imagine? Hopefully the benefits of having a modular system outweighs the inconvenience. Is it a much more expensive option though? Those batteries (new) are like £140 - £150 each, and the chargers are about £100 each, so your setup there is about £760 - £800. Is that really worth it over a single large 18650 pack plus charger? Not to mention the wiring nightmare... I think I'll still be making my own pack out of 18650s rather than using these bricks!
Yes you’ve got to take them out for charging and yes they are more expensive, chargers aren’t that much more like £60, the advantage is they have a warranty and the cells inside are more closely matched than any diy pack (because of the sheer volume the big manufacturer buy I suppose), so they won’t go out of balance as easily. My professionally made pack of 20S10P Samsung 18650 30Qs did not last a year. This setup is still going. It’s very interesting!
Thanks for the reply, Andy. :)
Ah yes, I didn't think about the warranty aspect! Wow, less than one year?! Ok, rethink required. Very interesting stuff this, looking forward to more.
Oh, would you mind answering my question re the dimensions of the forks? It's via your Clousto email please, mate. Cheers(RH)
Wow Andy that’s wild that you’re pack only lasted a year! That’s most expensive part on these bikes, well in most cases. Very interesting, thank you for the information. Very much appreciated bud, cheers from 🇺🇸
Yeah, I think pushing to the limits may have been the reason, we are still looking into it.
Thanks love it.
Good tune!
Hi Andy, love your videos. Am building my own high power ebike. I'm looking into drill batteries and have seen some 88v 15000mah cordless wrench batteries. This seems too good to be true considering ebike batteries are so expensive. Anyone got any knowledge on this. Cheers.
Thanks! Yeah those batteries sound interesting, have you got a link. If they are cheap they may be really low discharge, but then even at 10A it would be 800W so they might be useful.
ollie260886 you got a link?
10% battery loss in a year isnt bad