These tests below only note my personal opinion for the ESTIMATED ratings for the batteries I tested at the time I tested them. Any battery that is not genuine and in the original plastic wrap from a known and trusted manufacturer can change at any time! This can be one of the hazards of using “rewrapped” batteries or ones from smaller manufacturers 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, 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
The JP50P1 tabless cell is of the best performing (and cool running) small round cells we can buy, essentially the same in performance at 10A and 40A as the RS50, 50PL, and 50XG.
Some info and thoughts…
- These do not have the CCC*** logo shown on the cell in the datasheet and therefore are pre-production cells IMO. They might be absolutely identical to production cells, i.e., are samples of “production ready” cells about to be CCC tested, but we cannot know for sure.
- The JP50P1 only reaches about 73°C at 40A down to 2.5V. Its 40A continuous and 60A temp-limited (to 80°C) ratings seem reasonable.
- Its 180A pulse rating (5sec max) will result in huge voltage sag and age the cell faster, even if we don’t feel it get hot. This is true for any of the 5Ah super-cells.
- DC IR was low and incredibly consistent for the two cells I tested, 5.6mOhms and 5.7mOhms.
- Capacity was above the 5Ah “Mean” (nominal) datasheet rating and pretty consistent, 5064mAh and 5077mAh.
- Self-discharge for the two cells I had was under 1mV/day, a decent number showing the the cells I tested could be a higher grade.
- Standard charge rate is 2.5A with no maximum charge rate spec. But Section 5.1.1 of the datasheet mentions a max of 15A. I recommend staying at 3A or lower for long cell life. Charging at high current levels, especially up towards 15A, will shorten cell life.
- Datasheet max weight = 72.0g. The max weight of my two cells was 69.8g.
- Datasheet max size = 21.35mm dia x 70.45mm long. The max size of my two cells was 21.12mm x 70.22mm.
- The cells I tested appear to have been made on August 10, 2025.
- WARNING: Avoid welding within a centered 6mm diameter circle on the bottom of the cell, on or near the visible spiral weld line for the internal connection from the cell’s “jellyroll” to the metal can.
A huge thank you to 18650batterystore.com. A shipping mistake was made on a previous order and it took almost two weeks for the cells to arrive (usually take 3 days). 18650BS not only refunded the shipping but they sent my next order (these JP50P1’s) via overnight shipping! Any company can make a mistake, it’s what they do afterwards that counts.
***China Compulsory Certification, additional testing now required for all cells made or sold in China after August 1, 2024. The logo and certain information must be put on all cells once they are certified. This typically won’t be done by a manufacturer until the cell is ready to go into full production.
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
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