I am with you, that is why I use a 10,000mah power bank on a solar charger for field charging my phone, don't want to take the chance with a $150 battery.
Using P3 batteries to charge other devices?
- Thread starter Pedro Coelho
- Start date
Looks like this problem is more complicated than I originally thought. I just want to lug as little equipment as possible when i go hiking.
I dont understand some people talking about up to 16 charges though, on anything. My little power pack booster box jump started thingy is rated at double yours and Im lucky to get one charge. The dam,n thing will run the starter on a jetski for 30 minutes though! And starts my 454 with ease several times. A solar charger for it would be great for the lake trips though!
I found this out the hard way when I used one of my larger 6S packs to power my charger so I didn't have to listen to the fans scream on the power supply while charging some small 18650 LiPo cells for my torch. The step down in voltage from 6S to 1S cut the load down to almost nothing. By the time the charge was finished, the $250 6S LiPo was severely out of balance. Needless to say, that was the last time I ever did that..
Not sure, but I have charged my iPhone 6+ 3 times from 20% to 100% on my power bank, I use the 2Ah output for charging, so far it has worked well for $13
This article gives some insight: https://en.wikipedia.org/wiki/Lithium_polymer_battery#Charging
"The exact voltage ratings should be specified in product data sheets, with the understanding that the cells should be protected by an electronic circuit that won't allow them to overcharge nor over-discharge under use.
For LiPo battery packs with cells connected in series, a specialised charger may monitor the charge on a per-cell basis so that all cells are brought to the same state of charge (SOC)."
"The exact voltage ratings should be specified in product data sheets, with the understanding that the cells should be protected by an electronic circuit that won't allow them to overcharge nor over-discharge under use.
For LiPo battery packs with cells connected in series, a specialised charger may monitor the charge on a per-cell basis so that all cells are brought to the same state of charge (SOC)."
So I wonder, is there anything special about the DJI charger other than the plugs? Meaning could I take a charger I have lying around that is 17.5v 5.7a OUT and hook up the leads and be done?
From what I'm ready, all the power regulating over each cell is actually done with circuitry inside of the battery. Making the charger just a regular plain old charger. Thoughts?
From what I'm ready, all the power regulating over each cell is actually done with circuitry inside of the battery. Making the charger just a regular plain old charger. Thoughts?
I mean, what is so special about the charger? It only has 2 plugs so how can it "monitor" anything about the state of the battery? It makes me think that all the power management is being done inside of the battery where each cell can be individually monitored and charged independently.
I think I have seen posts of people using "arcade game" type power supplies to charge their batteries. My point is that it seem that the charger is not that special.
I think I have seen posts of people using "arcade game" type power supplies to charge their batteries. My point is that it seem that the charger is not that special.
Actually, the charger is built into the battery.. The 100w DJI 'charger' is actually just a power supply. So yes, the only thing special about the DJI power supply is the battery connectors. By using a power supply with enough wattage, you could wire up several of these battery connectors in parallel and charge as many as you want simultaneously. I have a 27v 2000w Mean Well power supply that I use for parallel charging my other RC LiPo's. It could charge around 20 P3 batteries at the same time, all I have to do is adjust the output voltage down to 17.5v with the turn of a screw.
N017RW
Premium Pilot
Not saying this battery does communicate with the charger, but communication using the '2 plugs' is not an issue.
The big concern is why doesn't it employ the proper CC/CV charging profile. This can be confirmed by monitoring the voltage at the terminals during charging.
And how silly do I feel right now spending $65 on a 100w charger when I have an entire milk crate in my house full of old power supplies. (live and learn, live and learn)
SO!.... with that said, it seems that all the power management circuitry is in the battery.... what would happen if you did a trickle charge using a solar powered rig with higher voltage but low amps? Would it eventually work?
SO!.... with that said, it seems that all the power management circuitry is in the battery.... what would happen if you did a trickle charge using a solar powered rig with higher voltage but low amps? Would it eventually work?
The battery has no need to communicate with the DJI power supply, this is because the charger is built into the battery. The two pin connector is nothing more than a positive and negative terminal.
N017RW
Premium Pilot
I see, you don't understand.
Research LiPo charging profiles if you are interested.
While the battery internals take care of balancing they do not use the recommended profile.
This is most likely the reason for such poor life span.
Research LiPo charging profiles if you are interested.
While the battery internals take care of balancing they do not use the recommended profile.
This is most likely the reason for such poor life span.
Charging at a low rate is fine, the balancing circuitry will take care of that. Unfortunately, balancing does not occur while discharging.
You obviously dont understand the difference between a charger and a power supply. There is NO LiPo of any value that does not have a power supply of some sort... Obviously! That power supply, in EVERY instance, does nothing but... wait for it... supply power! The charge determines the charging profile for the associated battery. So to say that the overpriced DJI power supply it the cause of anything lifespan related is crazy.
The charging profile they use is just fine. As long as the cells are balanced and sitting no higher than 4.35v after a charge, it did its job perfectly.
Keep in mind that this battery uses LiPoHV... It's not an ordinary LiPo, which is why it does not stop the charge at 4.2v. I would be surprised if anyone on here was a guru in regards to this battery chemistry considering that it's so new.
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