Help figuring out discharge current and voltage?
Help figuring out discharge current and voltage?
(OP)
Hi, I'm trying to figure out how to find the maximum specified discharge current (mA) and the end of discharge voltage (V) for this battery.
http://www.varta-microbattery.com/applications/mb_...
I'm looking to make a pack and get it tested and need to know that information. Just starting out learning about all this and it's a little confusing. Can anyone help me out or point me in the right direction?
Thanks
Mark
http://www.varta-microbattery.com/applications/mb_...
I'm looking to make a pack and get it tested and need to know that information. Just starting out learning about all this and it's a little confusing. Can anyone help me out or point me in the right direction?
Thanks
Mark





RE: Help figuring out discharge current and voltage?
The maximum unreasonable current would be 10mA. Things are going pretty non-linear at 10mA and that can cause more issues in a 'pack'. That 10mA should be treated like when a device wakes up and transmits for a second then stops drawing that much current. Consider it for pulse loading. If you need more than 10mA you must us a capacitor that will support the entire pulse/momentary load leaving the battery to recharge the cap over time at a more leisurely draw.
The data sheet state "End Voltage" as 2.0V - believe it.
Keith Cress
kcress - http://www.flaminsystems.com
RE: Help figuring out discharge current and voltage?
TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers
RE: Help figuring out discharge current and voltage?
Keith Cress
kcress - http://www.flaminsystems.com
RE: Help figuring out discharge current and voltage?
The unknown is the internal resistance.
I mis-wrote above, the standard AA cell can actually dump around 10A when shorted.
TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers
RE: Help figuring out discharge current and voltage?
Well, none of the graphs allow for more than about 12mA draw. I think this battery is strictly for memory backup.??
Keith Cress
kcress - http://www.flaminsystems.com
RE: Help figuring out discharge current and voltage?
TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers
RE: Help figuring out discharge current and voltage?
For example:
If you draw a constant 1mA at 23°C then capacity is 1900mAh meaning you can draw 1mA for 1900mAh/1mA = 1900 hours until the voltage is about 2V.
If you draw a constant 10mA at 23°C then capacity is 1400mAh meaning you can draw 10mA for 1400mAh/10mA = 140 hours until voltage is about 2V.
Be careful with batteries that advertise long shelf life. Not sure about these batteries but some manufacturers of Lithium Thionyl Chloride batteries advertise long shelf life but underestimate the effect of the passivation that helps provide the long shelf life.
RE: Help figuring out discharge current and voltage?
TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers