Why does my battery behave like this?

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Charging four 4-volt SLA batteries resulted in two cells exceeding 5 volts, indicating potential overcharging, while the other two remained at a healthy 4.8 volts. The pack is rated at 16 volts and 8 amp-hours, raising concerns about drawing 16 amps. Drawing 16 amps will likely not damage the pack, but it will significantly reduce the runtime to about half an hour. It's advised to limit charging time and monitor voltage levels to prevent damage. Proper management of charge and discharge rates is crucial for battery longevity.
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I have four 4 volts SLA and when I charge it, the two cells in the middle voltage goes up above 5 volts which is way pass the healthy charging voltage. The other two cells voltages stay at 4.8 which is good.


The pack is rated at 16v 8 aH. If I draw 16amp, will it hurt the pack?
 
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your sealed lead acid batterys are 4V each, if you charge them at 16A ,i believe they may in fact be damaged.. you should limit the time they are charging..and test the voltage periodically...
 
"If I draw 16amp, will it hurt the pack?"

If the drain current is 16amp not charge current. it is a different question. Charge current is around 2 amp max
 
The pack is rated at 16v 8 aH. If I draw 16amp, will it hurt the pack?
They will only last 1/2 an hour ,but i don't think it will hurt them , no..
 

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