Search found 27 matches

by ThomasEekels
May 23 2020 2:03pm
Forum: Battery Technology
Topic: e-Scooter modification (separate Battery Charging)
Replies: 8
Views: 176

Re: e-Scooter modification (separate Battery Charging)

ok,
these chargers come with a 2 way mains plug, as they are ' double insulated', and have no ground.
I will check next time I see the son :-)
by ThomasEekels
May 22 2020 9:16am
Forum: Battery Technology
Topic: e-Scooter modification (separate Battery Charging)
Replies: 8
Views: 176

Re: e-Scooter modification (separate Battery Charging)

Sorry if I was unclear.

To my knowledge, AC means that there is no permanent ground, but plus and minus will change every 1/50 second.
So having a connection between the charge output ground (minus) and the AC ' ground' , would connect plus to that DC ground also every 1/50. wouldn't it ?
by ThomasEekels
May 21 2020 11:52am
Forum: Battery Technology
Topic: e-Scooter modification (separate Battery Charging)
Replies: 8
Views: 176

Re: e-Scooter modification (separate Battery Charging)

Bytheway.. even if the test shows no connection... could this happen when under lead and switching to charge mode ?
by ThomasEekels
May 21 2020 11:51am
Forum: Battery Technology
Topic: 2nd battery for Bosch active-line on Sparta B2 ?
Replies: 3
Views: 106

Re: 2nd battery for Bosch active-line on Sparta B2 ?

Well, not a charge port of the battery, but the charge port of the bike. This port looks similar to the connector of the battery. If the battery is in the dock, the standard charger can connect to this extra port, to charge the battery in the bike. If the battery is out, the charger connects to the ...
by ThomasEekels
May 21 2020 11:36am
Forum: Battery Technology
Topic: e-Scooter modification (separate Battery Charging)
Replies: 8
Views: 176

Re: e-Scooter modification (separate Battery Charging)

Hi Amberwolf, thanks for the reply. To be frank, I had no idea there could be a problem like you describe. Anyway, I will do these test, that is not a problem. But as in AC, the plus and minus will change at 5 hz... would that connection not kill the DC charge end of the charger anyway? But can you ...
by ThomasEekels
May 20 2020 8:05am
Forum: Battery Technology
Topic: 2nd battery for Bosch active-line on Sparta B2 ?
Replies: 3
Views: 106

2nd battery for Bosch active-line on Sparta B2 ?

Our Sparta B2 e-Bikes both now have their second battery. Mine gave out completely, before replacement. My wife's got less capacity, approx 40%, so we replaced it also. So now I have 2 good and one less good battery. The bike has a dock for the battery as well as a charge port for charging in the bi...
by ThomasEekels
May 20 2020 7:51am
Forum: Battery Technology
Topic: e-Scooter modification (separate Battery Charging)
Replies: 8
Views: 176

e-Scooter modification (separate Battery Charging)

My son has a Chinese e-Scooter that currently needs replacement of it's 3rd set of led-acid batteries. It is a 4-pack 48V system. We think the lifetime of the packs is not optimal and also the chargers tend to burn so it is an expensive km-price. We now consider a modification for the new set batter...
by ThomasEekels
Mar 15 2020 4:30am
Forum: Battery Technology
Topic: Double battery power for drone
Replies: 6
Views: 346

Re: Double battery power for drone

ever seen any balance 3s y-cable at Ali ?
by ThomasEekels
Mar 15 2020 1:53am
Forum: Battery Technology
Topic: Double battery power for drone
Replies: 6
Views: 346

Re: Double battery power for drone

Yonyjou,
do you mean I do not have to disconnect them to balance charge them ?

So not just plug both mains into a y-plug, but also plug both 3s-balance plugs into a self-made 3s balance y-plug ?
As such, I can balance-charge the dual pack as one (in my Imax B6 ? )
by ThomasEekels
Mar 14 2020 3:25pm
Forum: Battery Technology
Topic: Double battery power for drone
Replies: 6
Views: 346

Double battery power for drone

Hi All, i am planning to extend the flight of my drone, by adding a 2nd battery. The max payload of my drone is more than the weight of an additional battery, so that is not the problem. For now, I have designed a docking station that comes in place of the original battery and that has a cable split...
by ThomasEekels
Mar 10 2020 3:30pm
Forum: Battery Technology
Topic: Battery protection board or...... balance wires?
Replies: 8
Views: 387

Re: Battery protection board or...... balance wires?

They are brand new. I bought them to rebuild my e-bike, but it is Bosch, so that does not work. Now I seek new destination.

Can I just add the BMS and also add external balance wires ? will the balance charger not interfere with the board's balance ?
by ThomasEekels
Mar 10 2020 2:38pm
Forum: Battery Technology
Topic: Battery protection board or...... balance wires?
Replies: 8
Views: 387

Re: Battery protection board or...... balance wires?

So I can just skip the board, add balance wires and let the charger do the balancing ? It is the Imax B6 ....
by ThomasEekels
Mar 10 2020 2:28pm
Forum: Battery Technology
Topic: Battery protection board or...... balance wires?
Replies: 8
Views: 387

Battery protection board or...... balance wires?

Hi All, I have a bunch of 18650 3000mah li-ion cells doing nothing, so I want to build some packs for my drone. I am planning to make 3s2p packs but I lack some theory for charging etc. If I connect them in 3s 2p, I can add a battery protection board, but does that also take care of cell balancing d...
by ThomasEekels
Dec 05 2019 3:36am
Forum: Battery Technology
Topic: Rebuilding scooter battery
Replies: 7
Views: 624

Re: Rebuilding scooter battery

Thanks for this info.
Indeed,the scooter does not have a balance between the 4 led-acid packs. The individual charge for balance is a good tip.
I could run4 sets ov 12v leads to the outside...

however.. any comments on my initial questions ?
by ThomasEekels
Dec 04 2019 11:15am
Forum: Battery Technology
Topic: Rework drone lipo with generic pack
Replies: 5
Views: 665

Re: Rework drone lipo with generic pack

First, I decharged the pack, just to be sure, by wiring a car bulb over the terminals https://1.bp.blogspot.com/-GNPYiATh23U/XefajYfBe_I/AAAAAAAAUxc/G-5QYjImWwQSXX8f3Sqcz9NshKShXn27gCLcBGAsYHQ/s1600/20191126_213431.jpg Next, I cut it open with the Dremel, starting at the less risky and. https://1.bp...
by ThomasEekels
Dec 04 2019 10:54am
Forum: Battery Technology
Topic: Rebuilding scooter battery
Replies: 7
Views: 624

Rebuilding scooter battery

Hi all, our son has an electric scooter that runs on 4 Led-acid gel batteries. Now he has ruined his 3rd set and it becomes an expensive hobby. He asked me if I can replace the led-acid by a lI-Ion battery system. I am thinking on that. There is much room, having 4 spaces for a 12V led battery avail...
by ThomasEekels
Nov 20 2019 12:16am
Forum: Battery Technology
Topic: Rework drone lipo with generic pack
Replies: 5
Views: 665

Re: Rework drone lipo with generic pack

So, I will start cutting the case with a Dremel. Starting next to the connector / front size. There will be no battery in there. Than I will try to force it open by pulling the two halves. If no success I will cut a circumference.
by ThomasEekels
Nov 19 2019 3:33am
Forum: Battery Technology
Topic: Rework drone lipo with generic pack
Replies: 5
Views: 665

Re: Rework drone lipo with generic pack

Yes Amberwolf, this is a hard case pack for a specific copter. https://www.readyquadcopters.com/wp-content/uploads/2017/11/image01.jpg I need the case for the connector placement. I can not plug in a generic pack so deep into the bay. I now have 3 packs like this, so I can save a lot of money refurb...
by ThomasEekels
Nov 18 2019 3:59pm
Forum: Battery Technology
Topic: Rework drone lipo with generic pack
Replies: 5
Views: 665

Rework drone lipo with generic pack

I just bought a Yuneec Q500 drones, with 2 ' dead' batteries. They are special plastic cases with a flexible top and bottom. Inside are the lipo's ... a 3s2p 11.2V The soft sides are under pressure and not flat anymore. Probably the reason why the batteries are dead. My idea is to open the case with...
by ThomasEekels
Nov 13 2019 4:37am
Forum: Battery Technology
Topic: Bilding a 'distributed' 3s 6p Li-Ion pack
Replies: 9
Views: 768

Re: Bilding a 'distributed' 3s 6p Li-Ion pack

I have never seen that balance hub. May be it is something I need. But it shows only power leads. How can it balance the cells in the individual packs ? Or is that not necessary ? I can imagine it balances the packs. this hub would be a great add-on for my design, if the individual packs benefit fro...
by ThomasEekels
Nov 12 2019 3:58pm
Forum: Battery Technology
Topic: Bilding a 'distributed' 3s 6p Li-Ion pack
Replies: 9
Views: 768

Re: Bilding a 'distributed' 3s 6p Li-Ion pack

Parallel first is not an option.
It will be 6 separate packs of 3 cells in series.

so they will only be parallel when connecting them to the power hub.
I hope they will balance themselves at that point. The individual packs will have all 3 cells balanced by the 3s charger.
by ThomasEekels
Nov 12 2019 9:59am
Forum: Battery Technology
Topic: Bilding a 'distributed' 3s 6p Li-Ion pack
Replies: 9
Views: 768

Bilding a 'distributed' 3s 6p Li-Ion pack

Hi to you all. I am into design (and later and build) my own hexacopter, that will be powered by a 3s Li-Ion pack. I want to hide the batteries into the frame components, which could be done in the rotor arms. Each arm can hold at least one 3s pack, (may be even 2). Let' s start with one, for the di...
by ThomasEekels
Sep 01 2019 6:10am
Forum: Battery Technology
Topic: Battery pack revision for Bosch 400
Replies: 17
Views: 1158

Re: Battery pack revision for Bosch 400

flippy wrote:
Aug 20 2019 9:04am
no, you cant because the bms is already dead.

Maybe my question was not clear: I intended a new battery with good BMS. and put the rebuilt battery, (without BMS) in parrallel after charging.
by ThomasEekels
Aug 20 2019 8:03am
Forum: Battery Technology
Topic: Battery pack revision for Bosch 400
Replies: 17
Views: 1158

Re: Battery pack revision for Bosch 400

Another out-of-he-box. idea. If I can not get the original battery BMS, but rebuild the battery pack with ordinary 10S bms, can I put the DIY pack parallel to an original Bosch pack ? Like charge it separately, but connect the decharge in parallel before the ride? Just piggy bag both battery packs. ...
by ThomasEekels
Aug 19 2019 12:13pm
Forum: Battery Technology
Topic: Battery pack revision for Bosch 400
Replies: 17
Views: 1158

Re: Battery pack revision for Bosch 400

As soon as a single cell gets below 2v the bms commits suicide. You cant buy blanks because a unpowerd bosch bms means a dead bosch bms. This is done to force you into the bosch ecosystem and dealership for maximizing profits. Its the apple of the ebike world. Fun fact: the 300 and 400 powerpacks u...