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can i just soldering the DC jack and connect with the battery directly?
Yes, you need a smart charging circuit for Li batteries such as provided by the EUP8054.......................
Also, I find that some say adding EUP8054 is necessary, is it right?
Yes, you need a smart charging circuit for Li batteries such as provided by the EUP8054.
I see, is there any other choice better than EUP8054?
There are hundreds of different battery chargers available from many different manufacturers. It is difficult to say what is the best one for you because we do not know your application:
- Exactly what kind of battery you have?
- What is the circuit you are powering?
- What is the charging method USB/Wall adapter/colar cell/other)?
- What kind of package you can use?
1. LI polymer 3.7V battery
2. the circuit included a heater and draw 1A when operating
3. Charging method through the Wall adapter Li battery charger ( output 5V, 500mA)
4. Design to use DC jack (2.5mm)
In his E-Cigarette thread, the battery is a Lithium 18500 1000mAh one.
An E-cigarette usually has a tiny 200mAh Li-Po battery that can fit inside the cigarette. Because of its low capacity a timer shuts off the heater after about 5 seconds. The battery must be charged or replaced every day. His much larger higher capacity battery might not need a timer and its charge might last more than one day.
He does not understand that he needs a charging circuit with protections like the one built into a cell phone. He has what he thinks is a charger but it is simply a power supply for the charger circuit that he does not have.
Ok.. sounds doable, but if I was designing this, I would buy my Lithium battery from a reliable vendor that provides full datasheet of the battery.. wouldn't use a cheap battery and just assume max charging current, charging voltage.. or even capacity. Good thing is that the battery is probably disconnected from the load by default (when charging) and when the user wants to smoke he pushes a button that connects the battery to the load. Bad thing is that the battery is between your teeth when it explodes.
Well that is why he started this thread. And I think this is kind of a good project, but you are right, he must fully understand what he is doing.. it is not particularly hard, but there is a lot of details that needs to be taken care of. Take your time, study, build a prototype, but do not connect it to a battery before thoroughly testing the circuit.
Follow-ups.
1. What is the capacity? Can you post a link to the specs or tell us the exact model of the battery?
3. You won't be able to operate the heater-circuit while charging. I don't see what is the point of in-circuit charger in this case. It would be easier to buy a charger and remove the battery for charging.
I think his battery is old and/or destroyed because its 4.20V when fully charged drops to only 3.3V when loaded with "only" 1A. Maybe it is a cheap no-name-brand Chinese battery that cannot provide much current.
A Lithium cell is dead and should be disconnected from the load when its voltage drops to 3.2V.
I showed the spec's of an American name-brand 325mAh Li-Po cell that can provide 22.75A continuously.
I have some small American 160mAh cells that provide 4A continuously and the voltage barely drops (at the beginning of a discharge).
Does the heater heat enough when the battery supplies it with only 3.3V or 3.55V when the charge is new?
When the battery voltage drops from 4.2V when fully charged to only 3.3V when it is almost dead then does the heater heat enough?
A charger circuit for a Li-Po battery cell usually has an IC. You cannot use a "charger " for a cell phone because it is not a charger, it is a 5V power supply. The charger circuit is inside the phone.