A123 Lithium cell use

[team_mayhem]

are there any other battery packs like the dewalts with a123 cells like makita or bosch packs

[leorcc]

No, Bosch uses a different li-ion

[grant_ploughbot]

http://www.westlondonmodels.com/product1096/ThunderPower-TP-1010C/http://www.westlondonmodels.com/prod...ower-TP-1010C/
This is the 10 cell charger I use, when you buy it, it will only charge lipo/liIon - but if you buy a data cable you can download the new software for A123s, nicads, nimhs etc.
http://www.westlondonmodels.com/product1098/ThunderPower-TP-210V/http://www.westlondonmodels.com/prod...Power-TP-210V/
and thats the 10cell balancer i use which both link together. You can balance 2x 10cell packs together with that balancer i beleive.

[team_mayhem]

how much power do you think would be needed to run 2 speed 900s and a mag motor on 24v i though i may be able to do it with 2 but what do you think

[maddox]

The speed 900s can be run on a 3 or 4 cell pack. If they have a decent reduction.

The Magmotor, I suspect a S28-150. 2 packs of 8 cells parallel seems the least you need.
And then I doubt it has the stamina to run 3 minutes.

[typhoon_driver]

My nicads only expel around 1.2Ah during a 3min fight with a mag on 24v and two 18v drills on 24v.

The problem with running a mag is that you need large surge currents which is why I use nicads. I dont think A123s currently have the ability to give out large bursts of current so you will be looking towards 3 packs.

[nick]

On a weight for weight basis, A123 is always better than Nicads, unless the ambient temperature is above ~40C.

[geeza]

Matt is planning to use the Mag for an axe which would mean large start up currents, having not used such a mag before how many pack would people recommend. (i.e. how many Ah would be needed - I had suggested 4Ah to him for a 3 min fight)

[leorcc]

the amount of Ah is really not that important, more the amount of current the cells can take in short burst without degrading.

You will always be better of with 2 or more packs in parralel than 1 high mAh rated pack.

[nick]

Soldered 7S4PA123-M1 should reliably be able to burn out a S28-150 magmotor under any conditions before the cells are damaged. With 7S3P the batteries are still likely to outlive the motor. 7S2P, youre quite likely to slowly damage the cells without current limiting unless the magmotor is not working hard enough to get hot. In general, we should be current limiting low resistance motors. A123 wants current limiting more than Nicads, since the stall currents generally work out higher.