# Using LiPo cells without a protection circuit

I designed a PCB to provide the power circuit for my robot's servos. This has a LiPo battery protection IC (undervoltage/overvoltage) and a voltage regulator IC. I sent this PCB in to be manufactured, and went to order the parts...

Only to find out noone sells the IC (S-8253) I planned to use for protection. Seiko Instruments does not list this as out of production/outdated, and my quick initial search did show the IC on Digikey's website, but I did not apparently notice that it is not stocked. And I cannot buy 3000 chips ;)

Anyway, the PCBs will be here soon, and I would like to do some work on my robot during this Xmas break. How bad will it be if I bypass the protection circuit for the time being? I plan to charge my LiPo using a proper charger, which I would hope balances the cells anyways... But I have no way to control even discharge.

Also, if anyone has any suggestions for undervoltage/overcurrent 2-4 cell protection ICs that can be hand soldered, I'd appreciate it :)

Thanks!

• Try Master Electronics masterelectronics.com . They also distribute Seiko parts. – brhans Dec 19 '14 at 18:36
• Unfortunately they require a minimum of $100 order for Canadian customers :( I actually did spend some time trying to order everything else from them (capacitors, either ICs, etc), but they don't seem to carry as much stuff as Digikey, making it difficult to get to the$100 limit even if I order lots of extras. – Mewa Dec 19 '14 at 18:39