What Batteries Do I Need?

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Last seen: 1 month 2 days ago
Joined: 04/20/2014 - 23:13
Posts: 77
Location: Spring Texas
What Batteries Do I Need?

Hey all.

I’ve got about 4-5 lights that use the 18650 cells. They are all Convoy lights with an XinTD thrown in for good measure.
My problem is that the cells I got for it are near the end of their life. They won’t hold a charge for long and the output isn’t what it should be. I’m pretty sure the cells I have came out of a laptop battery. Now I need to get new, or good used, batteries for them. The problem is that I don’t know what to get. I go looking and there are all kinds of 18650 cells. All kinds of different output levels. Do I need 3100 mAmp or will 2100 work? I think I even saw a 3600. They also have flat tops, protected cells and so one, as you all well know.

These are lights that I just use around the house, nothing serious. So, can you all give me some advice as to what cells I need to get to bring my lights back to life? If you know of a good place to buy them, I would appreciate it if you’d tell me. I need a decent, low cost charger too.

Any help you can give will be appreciated.

Thank you all.

Rayoui's picture
Last seen: 5 hours 48 min ago
Joined: 08/06/2019 - 00:38
Posts: 277
Location: Portland, OR

It really depends on the light. I use Sanyo NCR18650GA in just about every 18650 light I have nowadays. The flat top GA can also be used in most lights that accept button tops. Capacity is very good at ~3500mAh and it has a constant discharge rating of 10A.

If you want to prioritize maximum brightness over runtimes, the Samsung 30Q or Sony VTC6 are very good choices.

Generally, Convoy’s 18650 lights can accept just about any type of 18650 including protected cells. If you tell us what lights you have, it may be easier to recommend specific cells.

Last seen: 43 min 35 sec ago
Joined: 02/25/2016 - 17:38
Posts: 372
Location: Uruguay

They all use linear drivers, so brightness won’t change with any decent battery.

I would recommend one of the 3500mAh cells, either the Sanyo GA, Samsung 35E or LG MJ1, but anything from
http://batteries.parametrek.com/index.html?size=18650&mah=2550+_&dischar... should work.

You need button top if the light has springs only in the tail, otherwise both flat and button top will work. LiIonWholesale has a pretty good deal on the LG MJ1 at the moment, but you may need to compare shipping costs.
Jerommel's picture
Last seen: 2 months 2 weeks ago
Joined: 01/04/2014 - 13:18
Posts: 6380
Location: the Hague, Netherlands

The Samsung 30Q or Sony VTC6 are perhaps the best all rounders.
They are high drain cells with a decent capacity of 3000mAh.
That’s only some 12% less capacity than the well known lower drain cells, but you can use them also for lights that draw a lot of current.
They should cost about the same.

Last seen: 6 days 17 hours ago
Joined: 12/01/2012 - 13:18
Posts: 368
Location: USA

Liion Wholesale is running a sale which includes the LG MJ1 cells, flat or button top.


They should come out to ~$5 a cell shipped, which is a good price for quality, known genuine cells. Plus some shipping options come with a “free gift,” which is reported to be an inexpensive 18650 flashlight. My guess is a zoomie.

Last seen: 1 month 2 days ago
Joined: 04/20/2014 - 23:13
Posts: 77
Location: Spring Texas

Hey all.

Thank you kindly for your advice and help.

I’ll try and list them lights I have.

1. Convoy S2+
2. XinTD
3. A member gifted me a souped up SK89, I think. It’s the zoom light that takes the 18650 cell.

1 or 2 more but these are my main lights that get the most use.

I need to get an economical charger too. If anyone has one they’re not using, I’d rather buy from a member.

Thank you again and have a good weekend.


EdT's picture
Last seen: 6 months 2 weeks ago
Joined: 04/22/2014 - 17:16
Posts: 94
Location: Canada

I would suggest Panasonic NCR18650B 3400mAH or Panasonic NCR18650BD 3200mAH for the largest capacity batteries.
For charger I recommend a NiteCore IntelliCharger 2 which are inexpensive and versatile in charging both 1.5V NiMH and 3.7V Li-on batteries.
These two sellers on AliExpress sell genuine Li-on batteries and have 100% approval ratings.


eventera's picture
Last seen: 6 months 3 weeks ago
Joined: 01/14/2020 - 04:29
Posts: 2
Location: Omaha, NE

Cool, thanks for the help!