These tests only note my personal ESTIMATED ratings for these batteries at the time I tested them. Any battery that is “rewrapped” (not in its original factory wrap) can change at any time! This is one of the hazards of using these batteries so carefully research any battery you are considering using before purchasing.
Misusing or mishandling lithium-ion batteries can pose a SERIOUS RISK of property damage, personal injury, or even death. Never use them outside of a fully protected battery pack and you use them at your own risk. Never exceed the battery’s true continuous discharge rating (CDR), never let it get colder than 0°C or hotter than 60°C to help lower the risks and extend cell life, and keep the plastic wrap and top insulating ring in perfect condition. Never use a battery that is physically damaged in any way.
Testing batteries at their limits is dangerous and should never be attempted by anyone who has not thoroughly studied the dangers involved, understands the risks, has the proper equipment, and takes all appropriate safety precautions.
If the battery has only one current rating number, or if it only says "max", then I have to assume the battery is rated at that current level for any type of discharge, including continuous.
Test Results
These appear to be pre-productions samples (no CCC*** logo) and they are cool-running fantastic performers…
Continuous Current Discharge Graphs
Ratings and Performance Specs Graphic
18650/21700 Ratings & E-Scores and Recommended Batteries Tables:
The links are in my public Patreon pinned post: https://www.patreon.com/posts/pinned-post-137974946
I want to work for the community full time! If you feel what I do is worth a couple dollars a month and you would like early access to battery availability, battery testing and news, and a say in what I test, then please consider becoming a patron and supporting my testing efforts: Get more from Battery Mooch on Patreon.
Misusing or mishandling lithium-ion batteries can pose a SERIOUS RISK of property damage, personal injury, or even death. Never use them outside of a fully protected battery pack and you use them at your own risk. Never exceed the battery’s true continuous discharge rating (CDR), never let it get colder than 0°C or hotter than 60°C to help lower the risks and extend cell life, and keep the plastic wrap and top insulating ring in perfect condition. Never use a battery that is physically damaged in any way.
Testing batteries at their limits is dangerous and should never be attempted by anyone who has not thoroughly studied the dangers involved, understands the risks, has the proper equipment, and takes all appropriate safety precautions.
If the battery has only one current rating number, or if it only says "max", then I have to assume the battery is rated at that current level for any type of discharge, including continuous.
Test Results
These appear to be pre-productions samples (no CCC*** logo) and they are cool-running fantastic performers…
- Perform essentially the same as the Reliance RS50 and just a tiny bit better than the EVE 50PL. I don’t think you’d notice any difference between the performance of these three cells.
- The top choice probably boils down to longest cycle life (which we don’t know), price, and availability. If top performance is critical then you’ll need to test all three to see if one runs noticeably better in your particular application.
- The 50XG ran a few degrees cooler than the RS50 at 40A continuous but both cells would be about the same temp for a mixed high/low discharge profile.
- Rated for 40A continuous and 90A temp limited to 75°C and that seems reasonable.
- The datasheet also lists a 80°C temp limit but stick with 75°C as that’s the temp listed with the 90A rating.
- The 50XG has a datsheet max pulse rating of 140A for 3sec but I do not know how often you can pulse the cell that hard in any given time period. It’s going damage the cell (speed up aging) quickly though.
- I have done 40A and 100A (continuous) shootouts against the other top performing cells along with a teardown of this cell and the 40XG but the results are Patreon-only.
- Max charge rate is 15A but that will shorten cell life IMO. Stay under 4A for decent cell life.
- The two cells I tested delivered 5052mAh and 5083mAh. This is above the cell’s 5000mAh capacity rating but the consistency is not great.
- The two cells had DC IR’s of 7.1mOhms and 6.7mOhms. This is acceptable consistency and is very low (which is good).
- Max weight is 71.0gms and max size is 21.50mm dia. x 70.50mm long, from the datasheet.
- Since there is no CCC logo on the cell (indicating passing those tests) in my opinion this is a pre-production cell. I do not know when we’ll have access to full production cells but I don’t expect anything more than perhaps a tiny (unnoticeable) improvement in the production cell’s performance.
- The 50XG has a spiral weld line on the bottom (where the anode of the cell is internally welded to the can) but, thankfully, it’s different from other cells using a spiral (the 40XG is the same though). This makes it easier to determine which are being used for rewrapped cells.
Continuous Current Discharge Graphs
Ratings and Performance Specs Graphic
18650/21700 Ratings & E-Scores and Recommended Batteries Tables:
The links are in my public Patreon pinned post: https://www.patreon.com/posts/pinned-post-137974946
I want to work for the community full time! If you feel what I do is worth a couple dollars a month and you would like early access to battery availability, battery testing and news, and a say in what I test, then please consider becoming a patron and supporting my testing efforts: Get more from Battery Mooch on Patreon.
