Boost Regulator Modules and Circuits.

[Tim]

These batteries are high drain 2500mA Li-Mn. Originally I sourced these for my e-cigarettes. They are better than the so-called 6000mA Trustfires. I use them in all my homebuilds (8 for AUD$11), with the overcharge/discharge circuit suitable for 3 or 4 batteries (under$4ea.). I put a 1N4001 diode on the 1.5w panel ($5 ea.), and mount it on the stem, full time, but the in-built charge circuit allows charging from any un-regulated 12v source as well. All from Fleabay.
Recently I bought an XT17000 box without batteries- it too now has this battery set-up.
(The reg in green tape was removed once I changed 7660 to LT1054)
Home-made booster pictured is LM386 based kit($1.30) in box($1 ea.).9v battery holder, 8R speaker. I cannot believe detector shops charging $80-$160 for these things! Nor the price people pay for "branded" batteries. Some people have too many dollars, and not enough cents!

I hope this is helpful and/or relevant.

[6666]

Hello Tim
I've been searching on those LI-MN batteries and the prices are all over the place which makes me think they are being faked to,
would you mind saying where you got yours ? thanks.

[Tim]

I was trying to add a link, but unsure if it would link my ebay account, so the best I can do is: Ebay,search,worldwide,1~8x High Drain Rechargeable 18650 35A 3.7v LI-MN 2500mAh Button Top LOT

[6666]

I was trying to add a link, but unsure if it would link my ebay account, so the best I can do is: Ebay,search,worldwide,1~8x High Drain Rechargeable 18650 35A 3.7v LI-MN 2500mAh Button Top LOT

That search gives lots of results what is the seller name and will try that, thanks.

[Tim]

The one I have on my watchlist ATM is finetech007, the last ones i bought were from koala-ok.
Na mate, they ain't faked. Just scammers jacking the prices up- that's why despite my best intentions to support local businesses, I usually end up buying OS. From memory Trustfire 5000mA 18650's are about the same price, but cost $8 each locally.

[bklein]

Two good ways to kill lipoly batteries:
1) let the voltage drop below minimum voltage - often 3.0v but will vary depending on the chemistry
2) charge at a voltage above max.rating - often 4.2V but will vary (also need timed shutdown)

A paralleled pack may have 1 protection circuit, a series pack "should" have 3 so each cell is protected.
Li-on cells are starting to offer built in protection circuits for overtemp.

Your problem with boost converting will be the high currents and associated voltage drops and heat generated. Better/easier/more efficient to use higher voltage battery and drop down than lower voltage and boost.
If you are stuck on using a boost you might like one from a company called Richtek. Ran cooler than some others I tried.

[kt315]

IMAX B6

bought this intelligent charger on ebay. beast. what you can suggest something what i have to do first?

[6666]

Two good ways to kill lipoly batteries:
1) let the voltage drop below minimum voltage - often 3.0v but will vary depending on the chemistry
2) charge at a voltage above max.rating - often 4.2V but will vary (also need timed shutdown)

A paralleled pack may have 1 protection circuit, a series pack "should" have 3 so each cell is protected.
Li-on cells are starting to offer built in protection circuits for overtemp.

Your problem with boost converting will be the high currents and associated voltage drops and heat generated. Better/easier/more efficient to use higher voltage battery and drop down than lower voltage and boost.
If you are stuck on using a boost you might like one from a company called Richtek. Ran cooler than some others I tried.

You mean like RT9277A/B

[6666]

bought this intelligent charger on ebay. beast. what you can suggest something what i have to do first?

[ATTACH]37236[/ATTACH]

Hi KT315, I have a real B6, its takes a lot of button pushing through the menu to get working, and takes a bit of time to get used to
but basicly you select the type of battery, with batt type button
press start ONCE ,
select the number of cells ,press start ONCE
how much current you want to charge the battery, then hold down start button,
it does a battery check and starts chargeing

The factory defaults work ok, the time out timer comes set to 180 minutes I increased my setting to 300 minutes.

There are a few faked B6 chargers on the internet, I hope you got a good one.

[6666]

The one I have on my watchlist ATM is finetech007, the last ones i bought were from koala-ok.
Na mate, they ain't faked. Just scammers jacking the prices up- that's why despite my best intentions to support local businesses, I usually end up buying OS. From memory Trustfire 5000mA 18650's are about the same price, but cost $8 each locally.

Hi Thanks for the info
what is the actual tested capacity of the LI-MN batts you bought ? are they around 2500 maH

I bought some trustfire 18650 batts from that Koala-ok seller and they were fake only about 700maH, but got my money back.

[bklein]

The part I used probably was the RT8509 but they have several.

[Tim]

I bought some trustfire 18650 batts from that Koala-ok seller and they were fake only about 700maH, but got my money back.

I've never bothered to test any batteries sorry. I do know the Li-Mn will work for longer at a higher rate than the Trustfires I used to use. Now I use the solar panel set-up, so doubt I will have to ever charge any batteries, even running the very old, shagged out [and maybe fake] Trustfires from my e-cigs. However the XR71, with its' high usage at wide pulse width, may not keep up on an extended foray, and this set-up may not be ideal for long session moonlighters.
Out of interest, have you bought 18650s here? How much did they cost? Did you test their capacity? I am always dubious when sellers claim "ours are better than theirs".
All the Li-Mn I am currently using in my e-cigs ( a brutal discharge regime) have had 200+ charges and have not yet deteriorated. From memory the last lot lost capacity between 3 and 400 charges. They're the ones currently in my PI's with panels.
For the price, I can afford to keep a spare 8 or 10 pack(or 2) of new ones on the shelf.
As a jack of all trades and master of none, I will always try the cheapest option first. If it's a failure I usually make it work with bush ingenuity. Not everyones cup of tea, I know.
Recently my TV power supply packed up (240acv/12dcv)$68 for a newie at Jaycar. I got one for $11.99 from China. It didn't work, got sent a replacement. It stuffed up after a few months. So now I have a different brand, higher capacity one coming for $12.99. In the meantime I run the TV with a 4A charger and an old car battery.Pedantic? False economy? Muddling? Call it what you will. I've still only outlayed $25 instead of $68.

[6666]

Tim, I have not bought any 18650's here in Oz just too damn expensive so only bought OS, ended up with 2 good lots of 4 cells, capacity around 2400 maH
and 2 lots of rubbish cells around 400-700 mah.
I have ordered some of those LI-MN cells from the seller you mentioned , so will test them and see what happens.

I charge my lead acid battery's with solar, seems to work ok, good luck with the TV

[Ferric Toes]

Hello Eric,
I plan to run the AQ1B on those Sanyo Eneloop Pro NiMH. 8 cells will give me the required 9.6V and I can use a simple battery holder and charge them remotely on my smart charger. I don't mind the weight as I will need a bit of ballast in the enclosure.
I prefer the NiMH technology for their proven robustness plus the thought of a lithium setup (although unlikely) "toasting" my "significant investment" would be too much to bear......
Tony

Hi Tony,

Is it one of the older AQ1B, before the shortened version? The current shorter version has a 9.6V 2200mAh Ni-MH pack built in with the cells horizontal. I think there is a series diode internally to separate the audio from the charging circuit. Will this upset your smart charger I wonder?

Eric.

[Tony2]

PM sent.

Hi Tony,

Is it one of the older AQ1B, before the shortened version? The current shorter version has a 9.6V 2200mAh Ni-MH pack built in with the cells horizontal. I think there is a series diode internally to separate the audio from the charging circuit. Will this upset your smart charger I wonder?

Eric.