[adrenalnjunky]

I have a pair of 11.1v 2200mah packs, and a couple of Achesalot doubles. Now I'm building a MR11 triple, and need a larger voltage pack.

I know that in theory I could wire up a intermediate y-connector that would connect both packs in series to make a 22.2v 2200mah pack as far as the light knows.

Same would go for making a parallel harness I guess to make a 11.1v 4400mah source for maximum runtime on my current doubles, right?

Is there anything in the PCB's or whatnot that would cause issues with this?

I have a R/C hobby charger that can only charge up to a 3-cell li-ion/li-po pack, but can charge 2 packs @ a time, so I would like to keep using the 11.1v packs just to keep from having to buy a new charger. (Plus you can find decent deals on the 11.1 packs from time to time.)

 

[TOMMO]

I have had 2 li-ion laptop batteries in series for about a month now without any probs.
The only thing to watch out for i guess is having the right charger for the amount of cells/voltage.
I have made a detatchable lead set so i can still charge mine 1 at a time with the old laptop,works a treat!
Tommo.

 

[adrenalnjunky]

Yeah - I use Tamiya-style connectors on everything, I'd wire up a series y-harness and a parallel harness so the batteries can be charged independently, and quickly configured into whatever setup I need for the light they're connected to.

 

[ocean breathes salty]

What is the max input voltage of your driver? Hot off the charger, I would guess that pack would be pretty close to 25V..... may or may not be a problem.

 

[adrenalnjunky]

1000ma 3023 Buckpuck has a max input of 32v, so I'm safe there. My dual has a bFlex, and Max Vin is 25v, so I'd be wary there. Although from my math, a 11.1v 4400mah pack will have the same runtime as a 22.2v 2200 mah pack, right? ~48w/hr?

 

[ocean breathes salty]

1000ma 3023 Buckpuck has a max input of 32v, so I'm safe there. My dual has b bFlex, and Max Vin is 25v, so I'd be wary there. Although from my math, a 11.1v 4400mah pack will have the same runtime as a 22.2v 2200 mah pack, right? ~48w/hr?

Theoretically, the runtime should be the same... although the drivers efficiency diminishes as the disparity between input and output voltage increases. Exactly how big a deal this is in the real world remains to be proven :ihih: