My bat­tery doesn’t ex­ist

Mac Format - - MAC SOS -

Q I re­cently bought a Mid 2009 Mac­Book Pro. The ma­chine has spent the last cou­ple of years be­ing used as a desk­top re­place­ment, al­ways plugged into the mains adap­tor. When I try to boot it from bat­tery, noth­ing hap­pens. If I check with Sys­tem In­for­ma­tion, it re­ports there is no bat­tery in­stalled. I have tried re­plac­ing the bat­tery and re­set­ting the SMC but this hasn’t made any dif­fer­ence. Do I need a new logic board? Ciar­ian Rus­sell A It might just be the bat­tery sen­sor. An Ap­ple Au­tho­rised Ser­vice Provider ought to be able to re­place this for you, but it’s ac­tu­ally not im­pos­si­ble to do yourself. If you are com­fort­able with open­ing the case of your MBP, there are nor­mally a few re­place­ment bat­tery sen­sor parts on eBay for £10-£20.

In fact, you may not even need a new sen­sor. I’ve seen cases where the sen­sor sim­ply comes loose and some­times shows 100% charge and at other times 0%.

That’s the best case sce­nario. At the other end of the scale, it’s pos­si­ble that you have a fault on the logic board it­self (a dry solder joint or a cracked cir­cuit board track that pre­vents the bat­tery sen­sor from com­mu­ni­cat­ing with the SMC). There isn’t any eco­nom­i­cal way to re­pair that. You would have to re­sign yourself to keep­ing the Mac­Book Pro as mains-only ma­chine or else sell it to some­one else on that ba­sis and get an­other one. Sec­ond-hand lap­tops are al­ways a bit of a lot­tery.

Bat­tery sen­sors for MacBooks are quite a com­mon sec­ond-hand part avail­able for sale on eBay.

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