Your Battery Number Is a Guess

That battery number is a guess. Tag the friend who panics at ten percent. Your phone shows a battery percentage, a clean, exact-looking number sitting right there in the corner of the screen. It feels like a plain fact.

Namba ile ya betri ni kisio. Mtaje rafiki yako anayeingiwa na hofu ikifika asilimia kumi. Simu yako inaonyesha asilimia ya betri, namba safi inayoonekana kamili pale kona ya skrini. Inahisi kama ukweli mtupu.

It is not a direct measurement. There is no simple way to open up a battery and read how much power is left inside it. Instead, the phone checks the voltage and the flow of electricity moving through the battery, then runs those numbers through a small program that estimates the rest, based on how similar batteries usually behave.

Si kipimo cha moja kwa moja. Hakuna njia rahisi ya kufungua betri na kusoma nguvu iliyobaki ndani yake. Badala yake, simu hupima volteji na mtiririko wa umeme unaopita kwenye betri, kisha hupitisha namba hizo kwenye programu ndogo inayokadiria mengine, kwa kutegemea jinsi betri zinazofanana zinavyotenda kwa kawaida.

That is why the number can jump around strangely, dropping fast in cold weather or staying stuck at one percent for far longer than expected. The battery itself is not broken. The phone is only guessing, as carefully as it possibly can, and updating its guess every few seconds.

Ndiyo maana namba hiyo huweza kurukaruka kwa ajabu, ikishuka haraka wakati wa baridi au ikikwama kwenye asilimia moja kwa muda mrefu kuliko unavyotegemea. Betri yenyewe haijaharibika. Simu inakisia tu, kwa uangalifu wote inaoweza, na kusasisha kisio lake kila sekunde chache.