1.
I've just wired 2 of these http://www.dealextreme.com/details.dx/sku.11836 drop ins in series with a 14.8volt battery & the voltage across one is 10.4v & 3.9v across the other. Does anyone have any details of the driver board on these modules or can explain such a big difference?
2.
I use these Li's http://uk.rs-online.com/web/search/searchBrowseAction.html?method=getProduct&R=5306347 to drive 4 series connected R2 Crees via a 2.2 ohm current limiting (800mA) resistor in a bike light, but I've had 3 of these packs fail after a few hours use (only output 6 or 7 volts after a full charge cycle) RS have replaced them no problem but I'm getting paranoid it might be something I'm doing!
Any ideas gratefully invited.
I've just wired 2 of these http://www.dealextreme.com/details.dx/sku.11836 drop ins in series with a 14.8volt battery & the voltage across one is 10.4v & 3.9v across the other. Does anyone have any details of the driver board on these modules or can explain such a big difference?
2.
I use these Li's http://uk.rs-online.com/web/search/searchBrowseAction.html?method=getProduct&R=5306347 to drive 4 series connected R2 Crees via a 2.2 ohm current limiting (800mA) resistor in a bike light, but I've had 3 of these packs fail after a few hours use (only output 6 or 7 volts after a full charge cycle) RS have replaced them no problem but I'm getting paranoid it might be something I'm doing!
Any ideas gratefully invited.