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The making of a perfect SecondLifeStorage/BLF Charger: the start of a new venture
Hello again guys and gals. BlueSwordM here.

So, I've noticed something interesting here.

Over on BLF, a flashlight forum, I've decided to start on the journey of making a product in a domain from which I have a lot of experience in.

In this case, it's flashlights, batteries, and chargers. So, why not build something that would be close to complete?

Over the years on this forum, I've learned so many things, and I finally want to give back to this forum which gave so much to me.

So, why not make a SecondLifeStorage/BLF charger, the ultimate charger from companies that we know, trust, and have confidence in their skills and experience?

It would be the best charger on the market, with amazing features such as these:


Chosen manufacturer: DLYFull (OEM of ISDT products, Liitokala, and OPUS)

1. Adjustable charging current: (0,05A-0,10A-0,20A-0,30A-0,50A-0,80A-1,00A-1,20A-1,50A-1,80A-2,00A-2,25A-2,50A-2,75A-3,0A).

2. Support for multiple chemistries (Lithium-ion 3,6V-4,2V/3,8V-4,35V, LiFePO4, NiMH, NiZn)

3. Temperature monitoring (45C below 2A, 60C below 3A).

4. 4 cell channels, with support for 10180 cells all the way up to 78mm 21700s.

5. Active cooling if temperature exceeds 45C, or/and if all channels are active above 2,5A.

6. Full current cut-off according to charging current (10%).

7. (5-10V)-30V input voltage compatibility. Stops charging if voltage goes below 10V, but keeps charging settings. DOES NOT RESET ON CHARGING INTERRUPTION.

8. Nickel plated brass rails for more accurate internal resistance measurements. Or nickel plated A3 steel just in case. I have a backup plan for that last one.

9. Internal resistance measurements.*

10. Manual low voltage recovery for lithium-ion cells. Numbers based on 18650 capacities
- Below 2,5V: maximum charge rate of 100mA
- Below 2,0V: maximum charge rate of 50mA
- Below 1,75V: has to be manually activated and confirmed if the feature is enabled
- Below 1,0V: maximum charge rate of 25mA
Disabled from the factory

11. Adjustable max charging voltage for lithium-ion: 3,50V-(n1+0,1V)…(n6+0,1V)-4,2V-4,25V-4,30V-4,35V

12. Storage charge/discharge mode: 3,6V

13. Individual channel selection

14. 8 button UI (4 for voltage control, 4 for current control and other functions)

15. 100-200-350-500-700-1000mA constant current discharging functionality

16. Automatic charging current adjustment available


1. Factory voltage calibration.

2. Reverse polarity protection.

3. Charging/discharging data to USB drive.

Wouldn't that be great to have? Our own perfect little charger.

It's going to be an black anodized aluminium charger for good heat dissipation. To be honest though, the actual reason for this is cost, since a plastic mold would cost way too much for such a "low-volume" product.

Cost has been confirmed to be 49$US including a suitable power supply for max power charging. A lower cost 39$US charger without a power supply has been discussed, but not confirmed.

Anyway, that's it for me!

If you want to discuss about more stuff, just do it, and if you are interested, just leave a comment below.

Features can only now be modified, not added.

The more people that show their interest in buying the charger, the better.

Thank you all, and have a good day.

Note: If this is in the wrong forum, then please move it.

Link to the original thread and interest list:

Link to the manufacturer:

If you have any questions, just ask.
jm1, hbpowerwall, Korishan like this post
The power of lithium ion is in our hands!
We'll show them what we're made of!
A few ideas that would be great...
1) A way to disable #10 (physical switch, setting, etc).
2) Most of us buy many chargers because 4 slots aren't enough. A single charger that has many slots, such as 8 or 10, would be pretty epic and guarantee you most people would start buying those over the traditional 4-cell devices.
100kwh-hunter likes this post
1) Why would the feature need to be disabled however? Is it because of risks or something? At these current levels, nothing bad should happen.

2) Yeah, but then, the costs would jump up.
The power of lithium ion is in our hands!
We'll show them what we're made of!
But the cost should be per cell so an 8 slot should cost 2x compare to 4slot. The system I have here is 3-100+ slot and it scales based on cell basis rather linear. The first unit is actually the most expensive Tongue
NOTE! My links supplied in this message may be affiliated with Ebay and by clicking on them you agree on the terms.
YouTube / Forum system setup / My webpage  Diy Tech & Repairs

Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 100kWh LiFePo4 | 20kWh 14s 18650 |  66*260W Poly | ABB S3 and S5 Trip breakers
Upcoming: 14S 18650~30kWh
(09-02-2019, 02:58 PM)BlueSwordM Wrote: 1) Why would the feature need to be disabled however? Is it because of risks or something? At these current levels, nothing bad should happen.

2) Yeah, but then, the costs would jump up.

1) Because I don't want it and would not buy this charger if that's what it did. If I set it for 1000mA, I would want it to charge a 2.0V cell at 1000mA, not 50mA. Having a setting to disable the feature satisfies everyone's preference.
2) Fair statement. Would 2x 4-cell be cheaper than 1x 8 cell then I assume?

Just providing my feedback since you're looking for comments Smile
If you were able to meet condition 1 and 2, I would probably order 6-7 of these now lol

Also, just thought of something else... active cooling via high quality fan that is easily replaceable if it fails. It makes a huge difference in longevity of the device.
completelycharged likes this post
Hey mate,

That sounds cool. Some things I would like is if it had open source firmware that can be modifies and also some form of serial communication to the micro controller so I can connect to my Battery Database Portal.

completelycharged likes this post
Would be great to have external plugs, so other formats can be attached. Also this would prevent leaks from damaging the unit. This would give the unit huge leverage in the RC market. Depending on design, if cells did not share a common ground I would definitely buy one. You would be able to charge even the most stubborn mismatched 4s pack.
That sounds like an awesome charger. I love my opus's but I would buy one for sure. (If not more than 1)
******Hi My name is Jason and I have SOCD (Solar Obsessive Compulsive Disorder)*******
Current Powerwall - 1400 Cells 7s200p (modular 40p packs) ~ 12kWh of storage     4x 315W Canadian Solar Panels

Working on the next 7s40p packs     ~2.5kWh

Waiting on 2000 Cells of unused Sony vt4 (2000mah 30A) ~ 15kWh      hehehehehe  More Power
Really good idea, i agree on multi slots.
Make it expandable? so you can add a extra bay of 10 slots.
So when the first bay is ready, it will switch to the next bay, when that one is done to the third, ect.
You would be able to put everything full, have no time loss, pay attention one time a day.
The most expensive thing would be the first unit with all the controllers and psu.

Is the perfect storage voltige not on 3.3 to 3.4v?
At least i thought it was the perfect long term storage voltige.

Great job, incl a good ir meter

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