MakerFocus 4pcs 3.7V Lithium Rechargeable Battery JST1.25 Connector 2pin, 952540 3.7V 1000mAh Battery with Protection Board and Insulated Rubber Tape Compatible with ESP32 Development Board
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Return this item for free
Free returns are available for the shipping address you chose. You can return the item for any reason in new and unused condition: no shipping charges
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Purchase options and add-ons
Number of Batteries | 4 Lithium Ion batteries required. (included) |
Brand | MakerFocus |
Battery Cell Composition | Lithium |
Unit Count | 4 |
Voltage | 3.7 Volts |
About this item
- Note: The battery overcurrent protection is not a panacea, do not continue to charge and discharge the current and voltage with a large current beyond the range, otherwise the protection board will be damaged and invalid
- 1000mAh: The recommended charging current is 0.2A, the maximum is not more than 1A. The discharge current is recommended 0.55A, and the maximum is not more than 3A
- Over-discharge protection: When the battery is about to run out and the voltage is as low as 3.0V, the protection board will also be turned off and can no longer be discharged, forming an over-discharge protection effect
- Overcharge protection: When charging the battery, when the voltage reaches the highest battery voltage (4.2V), the protection board will automatically power off and shut down, indicating that it will not continue to charge when fully charged, form an overcharge protection
- Short circuit protection: When an accidental short circuit occurs, the protection board will automatically shut down within a few milliseconds and will not be powered on again. Note that the cell is short-circuited (not through the protection board). The protection board will also fail due to continuous high current, or the components are heated and damaged
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Product information
Product Dimensions | 1.77 x 0.98 x 0.39 inches |
---|---|
Item Weight | 0.633 ounces |
ASIN | B07CXNQ3ZR |
Batteries | 4 Lithium Ion batteries required. (included) |
Customer Reviews |
4.5 out of 5 stars |
Best Sellers Rank | #29,804 in Tools & Home Improvement (See Top 100 in Tools & Home Improvement) #101 in Power Converters |
Is Discontinued By Manufacturer | No |
Date First Available | May 8, 2018 |
Manufacturer | MakerFocus |
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Product Description
4pcs 3.7V Lithium Rechargeable Battery, 852540 3.7V 1000mAh Battery with Protection Board and Insulated Rubber Tape Matched with ESP32 Development Board WiFi Kits for Ar duino NodeMCU
Note:
1. The maximum operating current of this battery is only about 1A, can not be used for unmanned aerial vehicles, model aircraft or power tools and other products that require high current.
2. This battery interface is JST 1.25 pitch male, it can be matched with some ESP32 Development Board that it come with Female JST 1.25 mm connectors.
Specification:
Standard Voltage: 3.7V
Rated Capacity: 1000mAh
Weight: About 17g
Size: 8.5*25*40(mm)
Working Current: 1.5A
Overcurrent protection: 2~3A
Overcharge limit pressure: 4.25±0.05V
Over-voltage limit pressure: 2.45±0.30V
Charge current time: Standard Charging: 0.2C (8 hours); Fast charging: 0.5C (2.5 hours)
The maximum charging current: 0.5C
Continuous Dishcarge Current: 0.5C
The maximum discharge current: 1C
End-off voltage: 2.75V/pcs
Allowable charging temperature: 0℃ ~ +45 ℃
Allowable discharge temperature: -10 ~ +60 ℃
Allowable storage temperature: -10 ~ +40 ℃( within 3 months); -10 ~ +30 ℃ ( within 6 months)
Standard Charging Method:
Charging this battery to 4.25V at 0.2C constant current, then charge the battery at a constant voltage of 4.2V till it's charging current≤ 0.05C.
Package Including:
4 * 1000mAh 852540 3.7V Lithium Rechargeable Battery
Customer reviews
Customer Reviews, including Product Star Ratings help customers to learn more about the product and decide whether it is the right product for them.
To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyzed reviews to verify trustworthiness.
Learn more how customers reviews work on AmazonCustomers say
Customers like the performance and size of the battery. For example, they say it works well with the Heltec V3 board and the ESP32. They are also happy with the value. That said, some complain about the connectors breaking or coming off in transit. Opinions are mixed on the battery capacity and quality.
AI-generated from the text of customer reviews
Customers are satisfied with the performance of the battery. They mention that it works well with the Heltec V3 board, the ESP32, and for their LoRa projects. Some say that the battery works as intended and has great form and function.
"Works perfectly with my Heltec LORA v3." Read more
"I like these batteries that it is compact and works for my LoRa projects. What I don't like is it never charges above 4.1v...." Read more
"...I would say the battery works as intended!" Read more
"Confirmed to work. I haven't tested *actual* capacity yet. But a surprisingly tight, efficient package. Used for various Meshtastic boards." Read more
Customers like the size of the battery. They say it's small and compact, yet surprisingly tight and efficient.
"I like these batteries that it is compact and works for my LoRa projects. What I don't like is it never charges above 4.1v...." Read more
"Confirmed to work. I haven't tested *actual* capacity yet. But a surprisingly tight, efficient package. Used for various Meshtastic boards." Read more
"...Other than that they are very small and seem like decent quality just advertised incorrectly." Read more
"Small and compact. They do the trick!" Read more
Customers appreciate the value of the battery.
"Overall great. Good price for the bulk. Be aware the jumpers and 2 pin connector are very very small." Read more
"Capacity is as described, great form factor, and nice price. These are great for any makers looking to add battery power to your devices." Read more
"...I've updated to 4 stars based on this. The price for the batteries is good. I am deducting one star for the capacity...." Read more
"These little batteries are exactly what is described and a great value for the money. They work great with the ESP32 and it even recharges them." Read more
Customers have mixed opinions about the battery capacity. Some customers say that it's a great battery, while others say that the connectors are brittle. Some say that they can power the LilyPad boards for hours, while other customers say they only hold about 500 milliamp hours and failed capacity testing. Some also mention that the battery over discharges and bursts after an hour of use.
"...Note that this battery is far too large for something like a Heltec V3, but it works great in the waterproof IP68 outdoor enclosure used for the..." Read more
"These batteries last forever. I like that they are protected as well." Read more
"...should charge to 4.2v (+/-.02v) but once it hits 4.1v, it literally drops to about 3.9v in about 5 minutes even when it is not plugged into anything...." Read more
"...I have been using it for a week and it is still fully charged...." Read more
Customers are mixed about the quality of the battery. Some mention that they work with zero issues and appear to be high quality, while others say that they're not the best quality, not advertised correctly, and are of dishonest quality.
"Capacity is as described, great form factor, and nice price. These are great for any makers looking to add battery power to your devices." Read more
"...rather impressive for the size and price of these batteries, it is dishonest and immoral to stamp 1000 mAh when they are far from it...." Read more
"...Its a shame, the size, price and quality of the batteries is very good, but i don't want to mess with splicing the connectors." Read more
"Basically junk. Could be just a bad instance but I'm debating about buying another.I bought a second battery. It is also junk...." Read more
Customers are dissatisfied with the connector of the battery. They mention that it's brittle, and sometimes comes off in transit. Some customers also report that the batteries are solid, but the connectors are small and can damage them after one use.
"...Good price for the bulk. Be aware the jumpers and 2 pin connector are very very small." Read more
"...the batteries from being outright killed but they do seem to be getting damaged...." Read more
"...When trying to plug it into my Heltec v3 board the JST connector crumbled in my hand. Hoping the other three will not have this issue." Read more
"...the JST connector broke into little pieces. I had to use needle nose pliers to remove the pieces left in the connector." Read more
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This battery runs ESP32 Meshtastic nodes for several days. 2000 mAh batteries won't last even 24 hours. It is perfect for my Meshtastic router home node. Note that this battery is far too large for something like a Heltec V3, but it works great in the waterproof IP68 outdoor enclosure used for the router node.
I'll try to update this review after I've had a chance to discharge the batteries to understand the battery life.
As I type this I see that the charger is actually showing about 350mA current draw, which is lower than it should be but maybe it will actually come back to life. If it does, I will update the review but at this point I don't think I can recommend purchasing what I thought was going to be a great find.
Update -- Miraculously after about 15 minutes of drawing only negligible current (which could be explained by the charging circuit itself and the charging LED, the charger seemed to actually start delivering current. This is very odd as it normally starts delivering immediately. The charging circuit seems to deliver current for about how long I would expect and the end result is that device is alive and running at this time. I'm running the same test and it has currently been running for about a day and half. Based upon this, it seems that it did deliver on its promise of over-discharge protection. (I plan on recharging every six months anyway so the over-discharge was just an insurance policy so to speak.)
I've updated to 4 stars based on this. The price for the batteries is good. I am deducting one star for the capacity. I wasn't naive enough to think I would be able to actually draw 1000mAh but I did expect that I would get at least 750 and probably about 800mAh. Alas I am only seeing about 650mAh in my limited testing which is actually enough for my application but still not what I was expecting.
And now we drop it back to one star. All of the batteries provided reasonable life on the first charge/use and they all dropped significantly on their subsequent cycle typically only lasting a little more than 10% of the first cycle. A few of the batteries have completed their third cycle and it was about half of the second cycle. The discharge protection is preventing the batteries from being outright killed but they do seem to be getting damaged. (I bought 8 of these and 6 are in use with all that are in use seeing the same basic issue.)