Recommendations for 18650 cell replacements

I have a rechargeable led light system that uses 2 - 18650 batteries to run each light panel. There are 3 panels so I'm looking to upgrade all 6 batteries. Specs on what is currently used are inked on the the battery pack. Hopefully the pics of the pack show the specs. I am interested in possibly getting more run time by getting a higher capacity cells to replace the current ones. What are your recommendations for cell replacements? Also, is someone interested in assembling these packs together if I provide the old packs and new replacement cells? Thanks in advance for your assistance.

This is what's inked anyway.
DLG 18650-1C-1P2S 2000 mAh
Lithium-ion 7.4V 14.8Wh MH49015
140314 MADE IN CHINA
Do not dispose of in fire or short circuit

https://drive.google.com/file/d/1HPqHBYTBQ3uBN9O6VbN61QK5bxbTL7tR/view?usp=sharing
https://drive.google.com/file/d/1PdPsxRCTznGNvY_0AL-Jw-MqzywyeSMX/view?usp=sharing

SPIRITJCC98 said:

I have a rechargeable led light system that uses 2 - 18650 batteries to run each light panel. There are 3 panels so I'm looking to upgrade all 6 batteries. Specs on what is currently used are inked on the the battery pack. Hopefully the pics of the pack show the specs. I am interested in possibly getting more run time by getting a higher capacity cells to replace the current ones. What are your recommendations for cell replacements? Also, is someone interested in assembling these packs together if I provide the old packs and new replacement cells? Thanks in advance for your assistance.

This is what's inked anyway.
DLG 18650-1C-1P2S 2000 mAh
Lithium-ion 7.4V 14.8Wh MH49015
140314 MADE IN CHINA
Do not dispose

of in fire or short circuit

https://drive.google.com/file/d/1HPqHBYTBQ3uBN9O6VbN61QK5bxbTL7tR/view?usp=sharing
https://drive.google.com/file/d/1PdPsxRCTznGNvY_0AL-Jw-MqzywyeSMX/view?usp=sharing

Click to expand...

Seems that each pack has two 2000mAh 18650s in series, for a total of 7.4v and 2000mAh of capacity.

What we don't know is the current drains of the individual panels?

You could use something like the 10A Panasonic NCR-GA 3500mAH cells, or the 15A Samsung 30Q 3000mAh cells and figure out how to shoehorn them into place?

Chris

Thank you for your input Chris. I will have to see if I can find any other detailed specs on the panels. Still interested in knowing if anyone is interested in assembling these packs together if I provide the old packs and new replacement cells? Thanks in advance for your assistance.

Second the Samsung 30Q. Best all 'round 18650 cell IMO.

Knowing the current draw is important if you want to optimize performance with cell selection. Some cells are designed for efficiency at higher currents, some for capacity at lower currents. You can use the table at this link (http://lygte-info.dk/info/batteryIndex.html) to sort all batteries by mWh capacity at different currents, down to different cutoff voltages. If my application were 3A, I'd probably sort by mWh capacity at 3A down to 3.5V; if it were low-current, I'd sort by capacity at .2A down to 3V. And, I'd probably only consider the direct manufacturers rather than the re-wraps.

If you have a few extra mm, it might be easiest to get a 2x18650 battery holder with test leads already soldered on, esp if the current is low. You could get fancy, and get some heat shrink to encapsulate the whole package after installing the cells. Just be sure you use matched cells (same type, same date of manufacture, same usage) when putting them in series with each other. If you want soldered leads rather than a battery holder, and don't want to DIY (https://www.candlepowerforums.com/vb/showthread.php?278182-Soldering-wires-to-batteries-safely), PM me.