hello i bought a new 280ah lithium battery and when it arrived i fully charged it to 100% the company that i bought it from has there own app which said the battery was 100% charged but the ah only read 273.5 ah .i spoke to them and they said try discharging and charing it a few more times as the bms is still learning i have now done another 3 full charges and its still
https://zumbaliciouscrew.com/en/zumba-workout/ showing 100% charged via there app but the ah hours ars now at 273.3ah . i am a little concerned that the battery that was near on £800 should show the correct advertised amp hours ? any views on this would be much
cbd drops appreachated thank
It’s understandable that you’re concerned, especially after investing in an expensive battery. Based on what you've described, there are a few possibilities to consider regarding the difference between the advertised capacity (280Ah) and what you're seeing (273.3Ah).
The company’s explanation about the BMS needing to "learn" is plausible. Many lithium batteries use a Battery Management System (BMS) to monitor state of charge (SOC) and overall capacity, and this system often requires several charge-discharge cycles to fully calibrate itself. During these initial cycles, the BMS collects data and adjusts its readings to reflect the actual performance of the battery. However, after a few cycles, if the difference between the advertised and actual amp hours is still significant, this could indicate an issue with either the battery or its calibration.
It’s also worth noting that small discrepancies in battery capacity are not unusual. Many manufacturers specify a tolerance range, where the actual capacity can vary slightly from the rated value. A difference of 6.7Ah (which is about 2.4% less than the advertised 280Ah) may fall within acceptable limits, depending on the manufacturer’s guidelines. Still, it’s reasonable to expect the battery to be as close as possible to the advertised capacity, especially when you’ve spent £800 on it.
If you're still seeing this lower capacity after several cycles, it may be worth testing the battery independently. There are devices that can perform a capacity test by fully discharging and charging the battery while measuring how many amp hours it actually provides. This test would give you a more precise idea of whether the issue lies with the battery itself or just the BMS readings.
Given the amount you’ve paid, it’s important to hold the manufacturer accountable for their advertised specifications. If after several more cycles the battery is still showing significantly less than 280Ah, it’s worth reaching out to the company again. You could inquire about a potential warranty claim or a replacement, especially if the battery’s performance continues to fall short.
Lastly, remember that lithium battery performance can be influenced by factors like temperature. If you're using the battery in colder conditions, this could affect its capacity somewhat, so make sure to consider the environment in which you’re testing the battery. Keep an eye on the performance over the next few cycles, and if things don’t improve, it may be time to request further assistance or explore your options for a replacement.
