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If the battery is old, say three years, it may be worn out. Fully discharging batteries or using them beyond where they have noticeable loss of power results in reverse charging the weakest cell which then often shorts rendering the battery un-rechargeable.
If you read the TRUE specs on this speaker it is really a 200 Watt RMS unit. Make sure you are using balanced lines to the speaker XLR or TRS cables. The mixer should NOT be a passive mixer as these do NOT generate true balanced lines. Make sure the mic can't "hear" the speaker or you may be getting supersonic feedback that is above your hearing range that saturates the amp. If *********** can't stand to be ain a 15 foot square room with teh level you are generating, it is TOO loud for this unit to handle.
"Tested with other speaker and cable" ... you did not tell us the results of the test. If swapping the speakers and cablles still had the same dead side, it is probably the power amp for that side and not the mixer part. Take in for repair. If you had an accident of speaker cable not being plugged in fully or pulled out while operating, this pops the power amp real quick. They also just plain fail at times. Plug a set of headphones into the MONO out jack. If you can hear audio going through the unit then the mixer is OK... and the power amp on the failing side has a failure. Note the headphones will be low level and probably only one side, usually the left as this is a mono signal and headphones are normally stereo.
Connection all depends on what type PA system you have. Here are the rules: Power this device from the SAME receptacle your mixer is powered by, even if it means running an extension cord. Use ONLY a balanced line from the mixer... either TRS cable or XLR cable.