Battery problem global power model gps 12100

[mrel]

Hello
Global power model gps 12100 lifepo4 lithium battery problem battery say 100 % charge 14.4 volts measure volts again using muli meter say 14.2 volts,looking at those measure looking good.
But when connecting a 12volts bulb (1157 blub) the bulb would not light ,use same bulb on another 12 volts battery bulb light , also try hookup 1000 watts inverter don't work also.
So what be wrong with the battery?
El

[SunEagle]

Hello
Global power model gps 12100 lifepo4 lithium battery problem battery say 100 % charge 14.4 volts measure volts again using muli meter say 14.2 volts,looking at those measure looking good.
But when connecting a 12volts bulb (1157 blub) the bulb would not light ,use same bulb on another 12 volts battery bulb light , also try hookup 1000 watts inverter don't work also.
So what be wrong with the battery?
El

Have you measured the battery voltage after you connected the 12V bulb or inverter. Even if the battery shows over 14V it may not stay at that level under load.

[mrel]

Sun Eagle
The build in lcd on battery still show 100% charge 14.4 put bulb on battery terminal using muli meter show 0 volts ,but battery build in lcd show 100% 14.4 volts.
Is battery no good or something bad with the BMS?

[SunEagle]

Sun Eagle
The build in lcd on battery still show 100% charge 14.4 put bulb on battery terminal using muli meter show 0 volts ,but battery build in lcd show 100% 14.4 volts.
Is battery no good or something bad with the BMS?

Just measuring the battery voltage can fool you into thinking it is ok. Only measuring the SOC via a hydrometer or putting the battery under load will identify if it is still good.

[mrel]

Sun Eagle
What is SOC mean?
SOC via a hydrometer this is lithium battery ,how would you use hydrometer on lithium battery?

[SunEagle]

Sun Eagle
What is SOC mean?
SOC via a hydrometer this is lithium battery ,how would you use hydrometer on lithium battery?

SOC = State of charge and you are correct you really can't use a hydrometer on a lithium battery. Unfortunately a voltage measurement is not as accurate as the hydrometer so you may be out of luck understanding the issue as to why your battery is not performing correctly