<p>Fully Programmable Smart BMS with Bluetooth with Android or iPhone App.</p> <p>Fully Functional Android app is available free.</p> <p>The charge and discharge using the same port.</p><p></p><p>Smart BMS is designed for 4 series (4S 12V) Lithium (Lifepo4) DIY Battery Pack. 4 x 3.65 =14.6V Lifepo4 Chemistry battery</p><p>Dimension Size: 138 x 102 x17mm 120A version</p><p>Protection functions : This BMS is designed with a high quality IC chip specially for lithium battery protection. High detection precision degree on over-charge, over-discharge, voltage balancing.</p><p>Protection of over-discharge and over-current detections and delay times in detecting process.</p><p>Protection against over-voltage when charging Low temperature charging protection a -1c.</p><p>BMS with Precise SOC calculation with SOC function with automatic learning. Automatically charge battery function or static balance function for the battery system.</p><p>Mobile phone software to manage the detecting the battery working status and some parameters setting over wireless bluetooth.</p><p></p><p>Lithium Technology: Deep cycle lithium ion batteries have exceptional longevity since they manufacturing by LiFePO4 Cells with higher energy density, more stable performance & greater power, letting you use the battery more freely. Lifepo4 are more cost effective, so when factoring time and cost into your purchase.</p><p>The protection board has various protective functions for charging and discharging, such as overcharge protection, over-discharge protection, short circuit protection and over-current protect. Choosing a protection board and applying it appropriately is vital to the longevity your batteries. </p><p></p><p>It is ideal for home DIY and RV batteries with a wide rage of battery applications.</p><p>Protection function description</p><p>Overcharge protection: When the battery is under the charging state, the voltage keeps going up. Android application links are listed on our support site