Let's Make Robots!

NiCd discharge question

i have any questions about the topic


when a nicd cell have to be recharged? i am taking about voltage... 1,15v? 1,10v? 1,05v? 1,00v?  per cell

i have a 3xcell batt pack in a bot , the system self recharge when the voltage reach 3,4v, so 1,13v  per cell

is it an insufficient discharge? which can bring to lazy effect?


assuming that X is the ideal voltage per cell  to decide to recharge..... have i to read X  when the battery is under load or when it isunder no load.

I am asking this question because i have noticed that a almost discharged cell have very hi internal resistence so, it can provide 1,2 volts with no load and 0,9 volts when under load... so i am confused about this behaviour because i do not know in whick condition i have to read the voltage in order to decide is go or not for a reload.....

 anyway the problem is that under full load tha batt pack have not to drop under 3,4v, so i fear i amgoing for lazy efffect issue, 

yep the time between 2 consecutive reloads is dropping every time :\

Comment viewing options

Select your preferred way to display the comments and click "Save settings" to activate your changes.

Hi noise, if you want to charge early so the battery voltage doesn`t go below 3.4v during running but are worried about losing battery life build a discharge resistor into the charging circuit or bot.

I would read the battery voltage without load.