To get around this issue, most manufacturers have now set up the lithium charging profiles on their chargers to override this requirement, and they produce a 'probing' voltage to attempt to 'wake up' the BMS. On a lithium battery with a BMS in 'sleep' mode, it will appear to these chargers that the battery simply isn't there, even though it is physically connected, because no voltage can be detected. Some chargers require a minimum battery voltage to be detected before they start charging and this is to make sure there is a battery connected. Because the customer's battery had run completely flat the BMS had shut the battery down, effectively disconnecting the external battery terminals from the battery cells and preventing any further current flow into or out of the battery. These protect the battery from being charged or discharged when it is unsafe or may cause damage to the battery. All lithium batteries should have a BMS, whether internal or external, and these require the battery to have some power to function. The issue was a mixture of his charger & the battery's internal BMS. So why wasn't the lithium battery charging? The charger began charging the lead-acid battery with no problem, so the customer was confident the charger was not faulty. He then tried the unit on a lead-acid battery he also had lying around and changed the charging settings to suit. He checked the settings were set to lithium, which they were, and that the unit was getting power. When the charger was attached and turned on he noticed that it was not putting a charge into the battery. It was recently run down completely flat and the customer had removed it to charge it before a trip, using a charger he had purchased from another retailer a few years ago which was suitable for lithium batteries. The customer had purchased our TN Power Lithium 100Ah in November 2021. To help explain, the following is the scenario one of our customers contacted us with. As lithium batteries become more popular we have had contact from several customers about deeply-discharged lithium batteries not charging with, what appears to be, a working mains battery charger.
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