[Noisebridge-discuss] [HBRobotics] High density 2S LIPO with Charge/Discharge cutoffs - Brainless Battery Pack?

[Corey McGuire]

If I am understanding this product properly, the balancing is done in the
pack.  The voltage cutoff's are also done in the pack.  For all intents and
purposes, a 9v DC source should be all that is needed to charge this pack.
As long as you only need to provide 7.4 volts at 8 amps, you should be
fine.  This pack only has two leads.  That's for voltage in and out.  No
LIPO charging equipment required.  My expectation is that there is some
circuitry in the pack that does this for you.

On Wed, Sep 14, 2011 at 11:04 AM, William Garrido <blackspartan117 at gmail.com
> wrote:

> Nice! This would be great to drive my motors. I doubt my charger for LiPo
> would work, anyone know if a small LiPo charger for 2S? I have my
> chargers embedded on my robot.
>
> Or even my MC, would get rid of the need for a stepup! Too bad its not
> 6AH.
>
>
> On Wed, Sep 14, 2011 at 10:10 AM, Corey McGuire <coreyfro at coreyfro.com>wrote:
>
>> Need to replace NICAD/NIMH packs, but are afraid of the complexity of LIPO
>> or added charger cost?  This pack might fit your bill.
>>
>>
>> http://www.hobbyking.com/hobbyking/store/__19481__Turnigy_4000mAh_Spektrum_DX8_Intelligent_Transmitter_Pack..html
>>
>> Sparkfun and other places have single cells that have such cutoff
>> circuitry to protect your single cell from being charged too high or
>> discharged too low, but this is the first 2S solution I've seen. 2S LIPO is
>> a sweet spot because it nearly perfectly matches the voltage characteristics
>> of 6 Cell NICAD/NIMH packs, which are common everywhere.  This could be a
>> drop in replacement for such needs.
>>
>> One draw back, it appears to provide only 8 amps of current.  This is, no
>> doubt, because the circuit that regulates charge is in line with whatever
>> you plug it in to.
>>
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