Which battery pack?

[foxyrider]

One for the electricians out there!

So, as mentioned in another topic, i've been gifted a Focus ebike which came to me with a home assembled lighting set up run from a Makita power tool battery pack. This consists of a battery adapter wired to a switch unit which in turn operates two 1000 lumen headlights.

The bad news is that the battery and relative charger didn't come with the bike so whilst buying replacements is easy enough, what i don't know is which voltage/ah model to get, they seem to come in 12/18v and 3/4/5ah. It wouldn't be the end of the world if i can't get it to work but it's worth a shot (it was in use prevoius to me taking ownership)

Thanks in advance for any help.

[Jdsk]

Please add a photo of where the battery connects, showing the overall shape and dimensions and the position of the contacts.

And/or take into somewhere that sells the batteries.

Jonathan

[foxyrider]

Please add a photo of where the battery connects, showing the overall shape and dimensions and the position of the contacts.

And/or take into somewhere that sells the batteries.

Jonathan

It's a Makitalike adapter like this but not this exact one, I just need the correct power requirements so i don't blow it all up!

[rjb]

The Ahr rating just determines the run time.
The adapter you posted above has a 7.8v output from a 14/18V battery, so it could also be a 6V lighting set up. Try connecting a 6V battery ensuring correct polarity and see how it lights.

[Sum]

OP, can you show pictures of the actual adapter you're using, showing the label with the voltage input and output requirements? Based on the stock photo image you've shown, it seems you can use either a 18v or 14.4v battery, but they're not cheap to risk taking a punt on, so it's best to check to make sure the adapter you have has got the same voltage requirements.

Also, can you take pictures of the lights and connections as well? If only a 7.8v output is required then there may be better battery options out there.

[foxyrider]

I've demounted the entire light system - no point in carrying it around until its working!

So here are some pics.

The adapter

The lights & switch unit

As you can see, its all hard wired together, the adapter is for a Makita-esque battery. Yes they are USB ports and the whole thing with the battery is carried in a small frame mounted bag. There aren't any markings on the lights, i believe the switch unit came with the round lamp.

The chap who put it together passed away which is how i've ended up with the bike and light system

[rjb]

its possible that it runs from a standard usb power supply of 5V. In which case you dont need a battery or an adapter like the Makita one. A portable power bank may be suitable. Bit of rewiring and suitable plugs would be needed.

[Sum]

It looks like the adapter will run off either a Makita LXT 14.4v or 18v battery pack.

I don't recognise the lights, and hence power requirements, so it's difficult to advise on the runtime vs Ah capacity. But if they're really are 1000 lumen lights as the OP suggests, then the old Magicshine 1000 lm lights ran for 2~3hrs hours off a 7.4v 4.4Ah (33 Wh) battery, and I'd expect a 14.4v 3Ah (43 Wh) to last longer with a single light in operation perhaps. This is a guess though, and makes lots of assumptions. If the OP knows someone with a suitable battery they can borrow, then I suggest giving that a try first to get a benchmark runtime.

It's not clear to me that the lights run off 5v. They might do, but then the chap that DIY'd those lights may have modified the adapter, or tapped into a different voltage source inside the unit. I'd do some measurements first.