A BMS does it all for you but does limit output current.  I like Mikes 
option put I'd add a low voltage alarm.

http://www.ebay.com/itm/Lipo-Low-Voltage-Alarm-Cell-Checker-Li-ion-Lifepo4-Battery-2-8S-UK-Hardcase-/181221018365?pt=UK_ToysGames_RadioControlled_JN&hash=item2a319d4afd

Steve Tyng


On Friday, September 20, 2013 4:20:11 PM UTC-4, [email protected] wrote:
>
> From what I'm reading, the LIFEPO4 bats can't go below 2.4V or you risk 
> damage to the individual cells.  Since the BMS controls the balancing of 
> the cells while charging and has the low voltage cutoff function, wouldn't 
> you be better off just using a BMS since the PCB doesn't have a low voltage 
> cutoff or overcharge protection?  Just trying to get better educated on the 
> cells before dropping the cash...
>
> Derek
>
>
> On Fri, Sep 20, 2013 at 2:45 PM, TyngTech <[email protected] <javascript:>
> > wrote:
>
>> Yes, they break open the packs and extract the individual cells.
>>
>> S
>>
>>
>> On Friday, September 20, 2013 2:38:02 PM UTC-4, [email protected] wrote:
>>>
>>> Mike,
>>>
>>> I have some questions for you about those packs.  I know I would have to 
>>> buy two and wire them in series to produce 24V like I do with my SLAs.  I 
>>> understand that part, but the PCB won't fit those terminals.  Do you or can 
>>> you open up the battery and install the PCB on the individual cells in the 
>>> pack?  Does the PCB act like a BMS circuit?
>>>
>>> Derek
>>>
>>>  -- 
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