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I've recently heard stories of buying lithium batteries from Alibaba and Alibaba.
It's attractive because you can buy it at a much cheaper price than buying it domestically, but you need to be careful.
There are two types of lithium batteries, one is a raw cell, which is a single battery, and the other is a combination of 4 or 8 batteries to make 12V or 24V.
Raw cell image
In most cases, the assembled battery has a built-in BMS board that monitors and controls the state of the module in the battery box.
However, it is no exaggeration to say that the performance of BMS has a sharp edge and the performance of the battery depends on BMS.
When purchasing a combined battery, you need to properly determine which manufacturer the internal battery cell belongs to and what kind of BMS you are using before purchasing, or you can only charge with a dedicated charger, etc., and the battery capacity Inconveniences such as less
The content in the text and the image are irrelevant.
Unlike lead-acid batteries, many BMSs have a structure that shuts off charging and discharging when any cell reaches a specified voltage, so the solar controller connected to the battery will be traversed.
Many of the products sold in Japan have a balance resistor added to the BMS, or a balancer is installed instead of the BMS to prevent the solar controller from traversing.
Recently, there is also a BMS built into the assembled battery with a smart BMS (the operation can be displayed on the smartphone and the setting can be changed)