EEMB 4PACK Lithium Polymer Battery 3.7V 2000mAh 103454 Lipo Rechargeable Battery Pack with Wire JST Connector for Speaker and Wireless Device- Confirm Device & Connector Polarity Before Purchase

7/16/22 This rechargeable LiPo battery physically fits and works well as a replacement battery for the dknight MagicBox II Bluetooth speaker. As a bonus, this battery has 25% higher mA-hr capacity. However...IMPORTANT NOTE: battery power connector polarity is not standardized—connector polarity for these batteries may have to be reversed before installation!!

Double check polarity otherwise seem solid and so far up to spec. Worst case scenario de-pin and rearrange to match polarity.

Ordered for use with some RAK WisBlock Base Boards. After reversing the plug polarity so it matches the board, the batteries do work to power the board, and charge when the board is connected via USB. Unfortunately in spite of them having a BMS, three of the four batteries have swelled dramatically during the first three or four charging cycles. Straight from the box, they measure 9.37mm thick. The first battery is noticeably bulging and measures 10.85mm after being put through a few charge/discharge cycles over the course of a few days. The second one I tried, in the hopes that the first one was just defective, swelled to 9.8mm after just a single day, being charged by the RAK. The third one I've placed on my bench power supply with the CV/CC settings on 4.2v @ 1.0A (0.5C -- half what the Amazon product page says the battery is rated for; the battery itself is not marked with charge capacity information, nor is it printed on the including documentation. After charging this way for only 45 minutes, while still drawing ~500mA @ 4.2v, it has already swelled by 0.1mm. Will not be buying this brand of battery again, and all of these are getting recycled.

There must be no standard for which pin is + and which is -. Check polarity of your device before plugging in. Reversed them before plugging into PocketChip Linux computer and Arduino Metro-S2. You can carefully swap the pins with a magnifier and a sewing needle. They are delivered with low charge, but you still might want to cover one pin with tape while you pull out the other to prevent a short.

Ordered these as a replacement battery for a Cobra handheld radio. The batteries do not charge and do not work.

All the batteries I ordered want charge in my radios. I had them charging for 2 days and still want work.

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Tutto bene

Produit 5* je recommande

Pas de câble chargeur livré

Tutto in linea con le aspettative sia lato consegna che affidabilità tecnica del prodotto

Descrizioni prodotto False..... qualità bassa