I see that the UK supplier is offering the head units alone without batteries for a rather tempting £33. The standard battery is 8.4V and the specs on the DX website say that this is the maximum voltage, but does anybody know what the lowest they’ll run at is?
I'm specifically thinking of wiring up a pair in series as auxiliary lamps on the motorbike: with the engine running they should get 14.4V (ie 7.2v each), which I guess should be adequate to light them up… Can anybody confirm?
In a roundabout way I've wondered similar as the lights on my bike are total parp
Voltage depends on how you wire them - Parallel or series. Is it possible to get a voltage dropper to power them?
Is it possible to run two head units from one battery?
I can't see why it wouldn't work
Voltage depends on how you wire them - Parallel or series.
Yep! That would be why I was careful to state 'two in series'. 🙄 😉
Is it possible to get a voltage dropper to power them?
I'm sure it would be possible to make an 8.4V voltage regulator, but my skills are not in that area* - so I thought I'd consider the easy option first.
So, anybody got one they can put a voltmeter across when the battery's tired?
*ETA: Of course, if anybody can supply a circuit diagram and parts list to make a suitable regulator, I'd be eternally grateful for that, too. 😛
Sorry, reading too fast! 😳
Only one way to find out!
PP YGM
The overdischarge voltage will be approx 2.3V per cell +/- 0.1V So say about 4.6V +/- 0.1V as the limit before they switch off.
Marco, depends on how much current is being drawn by both lights when on and the current limit on the protection circuit of the battery, switching the second light on may well trip the protection circuit.
Ideally 2 lights & 2 batteries, should one fail you have a backup and not sudden darkness 😯
If you wired them to the motor electric system my guess is 2 dead lights
You would need to have an 8 volt limiter of some kind
Also the drivers in most lights will not like the very dirty electricity from a motor charging system
Would buying the light unit only and then using a better quality RC battery pack be an option?
Something like that http://cgi.ebay.co.uk/8-4V-NiMH-3800mAh-Battery-Pack-RC-Tank-Car-Airsoft-/180460326781?pt=UK_ToysGames_RadioControlled_JN
Is it possible to run two head units from one battery?
magicshine UK sell a y-spiltter cable for this very purpose...
Is it possible to run two head units from one battery?
Yes
Just done it myself. Run time of battery reduces by 50%
Simple physics really VIR