Maybe, it would depend on the maximum power draw the batteries can sustain without failing and if the charger can support the larger batteries.
If you do put some cells in parallel, make certain that they are of the same batch and capacity...
Rymel's Handheld PS2
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Re: Rymel's Handheld PS2
Here's a really simple low-battery style power gauge:
http://www.reconnsworld.com/power_12vbattmon.html
The LED turns on when the battery is getting low.
http://www.reconnsworld.com/power_12vbattmon.html
The LED turns on when the battery is getting low.
--John (and please call me John, it's really weird to be called by my username)
Fight MS Paint abominations! If you don't have a camera, go here, and pick something 3 megapixels or higher.
Fight MS Paint abominations! If you don't have a camera, go here, and pick something 3 megapixels or higher.
Re: Rymel's Handheld PS2
i don't see how the size of the battery affects the charging capability, or how power draw affects the effectiveness of the charging circuit. i also stated which batteries i'll be using so i'm not sure what you're trying to warn me about on that last part.Snow_Cat wrote:Maybe, it would depend on the maximum power draw the batteries can sustain without failing and if the charger can support the larger batteries.
If you do put some cells in parallel, make certain that they are of the same batch and capacity...
does it r0x0r j00r b0x0rz?
yes, my pants are quite happy
yes, my pants are quite happy
Re: Rymel's Handheld PS2
Spoiler:
Edit: TLDR;
Make certain that the cells/batteries can supply enough amps to run both things.
Putting cells of different capacities in parallel can be problematic for their longegivity and effective capacity. If necessary put the old cells in parallel, then on different terminals put the new cells in parallel.
.
Re: Rymel's Handheld PS2
OH. i was wondering where the confusion was stemming from. i'm not reusing the batteries that came with the tv, i kind of just assumed it was a bad idea to mix different sized batteries. i'm simply using two of the batteries i linked earlier, which is gonna give me 7.4v@25.2Ah total, way more than enough juice to run two devices that are 7.4v@2A and 2.5A. i'm assuming the total draw is the greater of the two, but i could be wrong. i figured the amp-hours i'd need for a 2.5a draw using a googled amp calculator and it said 12Ah would net me 3 hours of use at @2.5a. so since i don't feel like buying bigger ones again if i did math wrong (and i like bringing shotguns to knife fights), i just looked at 12a batteries and looked for ones that would fit once paired up. also if my math was grossly wrong and i was supposed to assume 4 amps...i'd have covered my ass.
that being said, thanks a lot for typing all that out, i learned quite a bit reading that the other day. work's been eating me alive so i haven't worked on anything, but i'm hoping to start work again in a few days once parts come in the mail. it's funny you brought all that up though, cuz i was going to use one of this site's premade smart chargers, and apparently batteryspace has you covered:
http://www.batteryspace.com/pcmwithequi ... 0-265.aspx" onclick="window.open(this.href);return false;
was originally gonna use one of these, but balance is important for no-explodey:
http://www.batteryspace.com/pcbfor72v74vpack.aspx" onclick="window.open(this.href);return false;
all that being said, and all that being read just before, i...THINK i can use the onboard charge port from the tv, but since you've brought to light the importance of cell balancing, i think the first charge circuit i linked circumvents any problems i might run into.
now, it's 7:38am and i'm rushing this post out before running late to work, so apologies if i'm way off on anything
that being said, thanks a lot for typing all that out, i learned quite a bit reading that the other day. work's been eating me alive so i haven't worked on anything, but i'm hoping to start work again in a few days once parts come in the mail. it's funny you brought all that up though, cuz i was going to use one of this site's premade smart chargers, and apparently batteryspace has you covered:
http://www.batteryspace.com/pcmwithequi ... 0-265.aspx" onclick="window.open(this.href);return false;
was originally gonna use one of these, but balance is important for no-explodey:
http://www.batteryspace.com/pcbfor72v74vpack.aspx" onclick="window.open(this.href);return false;
all that being said, and all that being read just before, i...THINK i can use the onboard charge port from the tv, but since you've brought to light the importance of cell balancing, i think the first charge circuit i linked circumvents any problems i might run into.
now, it's 7:38am and i'm rushing this post out before running late to work, so apologies if i'm way off on anything
does it r0x0r j00r b0x0rz?
yes, my pants are quite happy
yes, my pants are quite happy
Re: Rymel's Handheld PS2
Sounds reasonible;
I misread your earlier postings. Your choice of battery is appropriate, and I believe that either the PCB or the original chager should work.
The original MLP555584 batteries were rated to charge at a rate of 2800 mA (max) at 4.4V(max) (1.0C, 12.32VA), and your new PL8570170 batteries are rated to charge at a similar rate of 3.0 A (nom) at 4.2V (nom) (1.0C, 12.6VA), but can charge at a rate of 12.2A!.
The only issue may be that using the original charger could take a long time to charge up if it is running at a 'safe' 70% of max rate.
notes:
database.ul.com
I was unable to access the report from UL for the original batteries, and the new ones do not come up in the database search.
The nominal charging voltage for the MLP555584, like all lithium ion cells, is 4.2V. According to the specc sheet the second battery was tested with a charger set to at 0.1C (1250mA), well below the stated nominal current.
I misread your earlier postings. Your choice of battery is appropriate, and I believe that either the PCB or the original chager should work.
The original MLP555584 batteries were rated to charge at a rate of 2800 mA (max) at 4.4V(max) (1.0C, 12.32VA), and your new PL8570170 batteries are rated to charge at a similar rate of 3.0 A (nom) at 4.2V (nom) (1.0C, 12.6VA), but can charge at a rate of 12.2A!.
The only issue may be that using the original charger could take a long time to charge up if it is running at a 'safe' 70% of max rate.
notes:
database.ul.com
- BBFS2.MH46117 - Batteries, Household and Commercial - Component (MLP555584-2S1P)
- BBCV2.MH29654 - Lithium Batteries - Component (MLP555584)
I was unable to access the report from UL for the original batteries, and the new ones do not come up in the database search.
The nominal charging voltage for the MLP555584, like all lithium ion cells, is 4.2V. According to the specc sheet the second battery was tested with a charger set to at 0.1C (1250mA), well below the stated nominal current.
Re: Rymel's Handheld PS2
i guess i'll test the original charger at first, wired for balanced charging and see how that goes. i can't see any other reason for that third wire to be there otherwise. i just have to find that connector somewhere as i'd rather not ruin a perfectly good 7.4v pack just for the stinking connector. any idea what it might be?
http://i177.photobucket.com/albums/w227 ... G_1259.jpg" onclick="window.open(this.href);return false;
they're used on pc boards sometimes too...
i'll be honest, a chunk of that kind of went over my head as you're very much more knowledgeable on this subject than i am, but how is it the new batteries can charge at such a higher rate? regarding a longer charge time, no biggie, i'll deal unless it's REALLY slow. worst case i just order that balanced charge circuit and open it all back up.
http://i177.photobucket.com/albums/w227 ... G_1259.jpg" onclick="window.open(this.href);return false;
they're used on pc boards sometimes too...
i'll be honest, a chunk of that kind of went over my head as you're very much more knowledgeable on this subject than i am, but how is it the new batteries can charge at such a higher rate? regarding a longer charge time, no biggie, i'll deal unless it's REALLY slow. worst case i just order that balanced charge circuit and open it all back up.
does it r0x0r j00r b0x0rz?
yes, my pants are quite happy
yes, my pants are quite happy
Re: Rymel's Handheld PS2
I think that looks to be a receptacle, though I am uncertain as to the pitch/size. If you could post a picture of it next to a ruler I could figure it out.
Given the amount of fire I've seen, I would not say that my 'knowledge' has been all that effective.
The new batteries may be rated at a higher charge rate because of (any of)
Given the amount of fire I've seen, I would not say that my 'knowledge' has been all that effective.
The new batteries may be rated at a higher charge rate because of (any of)
- improved construction methods allowing for a greater area between terminal to accept a charge
- improved chemistry allowing for a faster recombination/charge acceptance
- greater optimisim by the manufacturer
Re: Rymel's Handheld PS2
i swear i'm not dead. work has just been really busy lately, so i had to put this on hold. i also realized there was a smarter way to mount screw posts, and i just haven't gotten around to doing it yet. i'll return to it soon...
does it r0x0r j00r b0x0rz?
yes, my pants are quite happy
yes, my pants are quite happy