{"id":151295,"date":"2025-07-16T05:55:30","date_gmt":"2025-07-16T03:55:30","guid":{"rendered":"https:\/\/xm.cz\/blog\/?p=151295"},"modified":"2025-07-14T11:15:35","modified_gmt":"2025-07-14T09:15:35","slug":"jak-spocitat-dobu-nabijeni-kdyz-zname-vykon-nabijeciho-adapteru-a-kapacitu-baterie-mobilu","status":"publish","type":"post","link":"https:\/\/xm.cz\/blog\/jak-spocitat-dobu-nabijeni-kdyz-zname-vykon-nabijeciho-adapteru-a-kapacitu-baterie-mobilu\/","title":{"rendered":"Jak spo\u010d\u00edtat dobu nab\u00edjen\u00ed, kdy\u017e zn\u00e1me v\u00fdkon nab\u00edjec\u00edho adapt\u00e9ru a kapacitu baterie mobilu?"},"content":{"rendered":"

Pus\u0165me se spole\u010dn\u011b do odhalov\u00e1n\u00ed jedn\u00e9 z velk\u00fdch z\u00e1had modern\u00ed techniky. Pro\u010d se jeden telefon s 5000mAh bateri\u00ed nabije za hodinu, zat\u00edmco druh\u00fd, se zd\u00e1nliv\u011b stejn\u00fdm akumul\u00e1torem, pot\u0159ebuje k pln\u00e9mu zotaven\u00ed hodiny t\u0159i? Odpov\u011b\u010f se neskr\u00fdv\u00e1 v magii, n\u00fdbr\u017e ve fyzice a n\u011bkolika kl\u00ed\u010dov\u00fdch parametrech, kter\u00e9 si dnes srozumiteln\u011b vysv\u011btl\u00edme. Uk\u00e1\u017eeme v\u00e1m, jak spo\u010d\u00edtat dobu nab\u00edjen\u00ed<\/b>.<\/p>\n

Miliamp\u00e9rhodiny a watthodiny<\/h2>\n

Nej\u010dast\u011bji se setk\u00e1v\u00e1me s kapacitou baterie ud\u00e1vanou v miliamp\u00e9rhodin\u00e1ch<\/a><\/b>, tedy mAh<\/b>. Je to u\u017eite\u010dn\u00fd, le\u010d ob\u010das trochu zr\u00e1dn\u00fd \u00fadaj. P\u0159edstavuje mno\u017estv\u00ed proudu, kter\u00e9 je baterie schopna dod\u00e1vat po ur\u010ditou dobu. Sama o sob\u011b n\u00e1m v\u0161ak o celkov\u00e9 ulo\u017een\u00e9 energii ne\u0159ekne v\u0161e, proto\u017ee do hry vstupuje je\u0161t\u011b nap\u011bt\u00ed, kter\u00e9 se u r\u016fzn\u00fdch bateri\u00ed m\u016f\u017ee m\u00edrn\u011b li\u0161it.<\/p>\n

\"V\u00fdrobci<\/a>
V\u00fdrobci ud\u00e1vaj\u00ed kapacitu baterie v miliamp\u00e9rhodin\u00e1ch<\/figcaption><\/figure>\n

Pro p\u0159esn\u011bj\u0161\u00ed v\u00fdpo\u010dty a porovn\u00e1n\u00ed n\u00e1m mnohem l\u00e9pe poslou\u017e\u00ed watthodiny<\/b><\/a>, tedy Wh<\/b>.\u00a0 Tato jednotka toti\u017e zohled\u0148uje jak kapacitu v amp\u00e9rhodin\u00e1ch, tak i nap\u011bt\u00ed baterie, a ud\u00e1v\u00e1 tak skute\u010dn\u00e9 mno\u017estv\u00ed energie, kter\u00e9 v sob\u011b akumul\u00e1tor dok\u00e1\u017ee uschovat. Je to poctiv\u011bj\u0161\u00ed a technicky spr\u00e1vn\u011bj\u0161\u00ed metrika, se kterou se dostaneme k mnohem p\u0159esn\u011bj\u0161\u00edm v\u00fdsledk\u016fm na\u0161ich v\u00fdpo\u010dt\u016f.<\/p>\n

P\u0159evod mezi t\u011bmito jednotkami je na\u0161t\u011bst\u00ed jednoduch\u00e9 matematick\u00e9 kouzlo. Sta\u010d\u00ed n\u00e1m zn\u00e1t kapacitu v mAh<\/b> a jmenovit\u00e9 nap\u011bt\u00ed baterie<\/b>. To se u lithium-iontov\u00fdch akumul\u00e1tor\u016f v mobilech pohybuje nej\u010dast\u011bji okolo 3,7 V nebo 3,8 V. Pak u\u017e jen dosad\u00edme do vzore\u010dku: Kapacita (Wh) = Kapacita (mAh) \u00d7 Nap\u011bt\u00ed (V) \/ 1000<\/b>. R\u00e1zem tak z\u00edsk\u00e1me p\u0159esnou energetickou kapacitu.<\/p>\n

N\u00e1zorn\u00fd p\u0159\u00edklad<\/b>: u baterie s kapacitou 5000 mAh dosad\u00edme: 5000 \u00d7 3,75 \/ 1000 = 18,75. Baterie m\u00e1 tedy 18,75 Wh.<\/p>\n

Jak spo\u010d\u00edtat dobu nab\u00edjen\u00ed?<\/h2>\n

Na druh\u00e9 stran\u011b rovnice stoj\u00ed nab\u00edjec\u00ed adapt\u00e9r, jeho\u017e nejd\u016fle\u017eit\u011bj\u0161\u00edm parametrem je v\u00fdkon ud\u00e1van\u00fd ve wattech<\/b><\/a>, tedy W<\/b>. Pr\u00e1v\u011b v\u00fdkon n\u00e1m \u0159\u00edk\u00e1, jak rychle dok\u00e1\u017ee nab\u00edje\u010dka energii do baterie \u201etla\u010dit\u201c. \u00dadaj o wattech dnes ji\u017e v\u00fdrobci na\u0161t\u011bst\u00ed \u010dasto tisknou p\u0159\u00edmo na t\u011blo adapt\u00e9ru, tak\u017ee jeho zji\u0161t\u011bn\u00ed b\u00fdv\u00e1 zpravidla ot\u00e1zkou n\u011bkolika m\u00e1lo sekund.<\/p>\n

\"V\u00fdkon<\/a>
V\u00fdkon nab\u00edjec\u00edho adapt\u00e9ru b\u00fdv\u00e1 uv\u00e1d\u011bn ve wattech<\/figcaption><\/figure>\n

Pokud \u00fadaj o wattech na adapt\u00e9ru chyb\u00ed, nezoufejte. V\u017edy na n\u011bm najdete vypsan\u00e9 hodnoty v\u00fdstupn\u00edho nap\u011bt\u00ed (V) a proudu (A). K v\u00fdkonu se pak dostaneme prost\u00fdm vyn\u00e1soben\u00edm t\u011bchto dvou hodnot<\/b>. Nap\u0159\u00edklad adapt\u00e9r s v\u00fdstupem 5 V a 2 A poskytuje v\u00fdkon 10 W. Dejte si pozor na adapt\u00e9ry s v\u00edce re\u017eimy, kde je pro rychlonab\u00edjen\u00ed ur\u010dena kombinace s vy\u0161\u0161\u00edmi hodnotami.<\/p>\n

Nyn\u00ed, kdy\u017e zn\u00e1me kapacitu baterie ve watthodin\u00e1ch a v\u00fdkon adapt\u00e9ru ve wattech, m\u016f\u017eeme p\u0159istoupit k z\u00e1kladn\u00edmu teoretick\u00e9mu v\u00fdpo\u010dtu. Ten je prost\u00fd: Doba nab\u00edjen\u00ed (h) = Kapacita baterie (Wh) \/ V\u00fdkon adapt\u00e9ru (W)<\/b>. Pro 18,75Wh baterii a 18W adapt\u00e9r by to teoreticky znamenalo dobu pot\u0159ebnou pro dopl\u0148ov\u00e1n\u00ed energie jen n\u011bco m\u00e1lo p\u0159es jednu hodinu. To zn\u00ed skv\u011ble, \u017ee?<\/p>\n

N\u00e1zorn\u00fd p\u0159\u00edklad<\/b>: doba nab\u00edjen\u00ed = 18,75 \/ 18 = 1,04<\/p>\n

Jak spo\u010d\u00edtat dobu nab\u00edjen\u00ed, kdy\u017e do hry vstupuj\u00ed ztr\u00e1ty<\/h2>\n

Jen\u017ee teorie je jedna v\u011bc a praxe druh\u00e1. Do hry toti\u017e vstupuj\u00ed ztr\u00e1ty<\/b>. \u010c\u00e1st energie se b\u011bhem nab\u00edjen\u00ed p\u0159em\u011bn\u00ed na teplo, co\u017e jist\u011b zn\u00e1te z vlastn\u00ed zku\u0161enosti, kdy je telefon i adapt\u00e9r na dotek tepl\u00fd. \u00da\u010dinnost cel\u00e9ho procesu se tak re\u00e1ln\u011b pohybuje jen mezi 80 a\u017e 90 %, tak\u017ee po\u010d\u00e1te\u010dn\u00ed v\u00fdpo\u010det mus\u00edme br\u00e1t s rezervou.<\/p>\n

\"Z\u00e1sadn\u00ed<\/a>
Z\u00e1sadn\u00ed roli v tom, jak spo\u010d\u00edtat dobu nab\u00edjen\u00ed, hraj\u00ed ztr\u00e1ty<\/figcaption><\/figure>\n

Dal\u0161\u00ed komplikac\u00ed je, \u017ee se telefon nenab\u00edj\u00ed st\u00e1le stejn\u011b rychle<\/b>. Zpo\u010d\u00e1tku, zhruba do 80 % kapacity, prob\u00edh\u00e1 nab\u00edjen\u00ed maxim\u00e1ln\u00edm mo\u017en\u00fdm v\u00fdkonem. Pot\u00e9 se v\u0161ak rychlost z\u00e1m\u011brn\u011b a v\u00fdrazn\u011b sni\u017euje, aby se chr\u00e1nila \u017eivotnost a zdrav\u00ed baterie p\u0159ed zbyte\u010dn\u00fdm opot\u0159eben\u00edm. Posledn\u00edch dvacet procent tak \u010dasto trv\u00e1 d\u00e9le ne\u017e prvn\u00ed polovina nab\u00edjec\u00edho cyklu.<\/p>\n

Abychom se tedy dobrali re\u00e1ln\u011bj\u0161\u00edho odhadu, mus\u00edme n\u00e1\u0161 teoretick\u00fd v\u00fdsledek upravit. Praktick\u00fd f\u00edgl je vyn\u00e1sobit ho koeficientem p\u0159ibli\u017en\u011b 1,5<\/b>. Tento n\u00e1sobek v sob\u011b zhruba zahrnuje ztr\u00e1ty \u00fa\u010dinnosti a zpomalen\u00ed v z\u00e1v\u011bre\u010dn\u00e9 f\u00e1zi nab\u00edjen\u00ed. Na\u0161e hodina se tak r\u00e1zem prot\u00e1hne na hodinu a p\u016fl.<\/p>\n

N\u00e1zorn\u00fd p\u0159\u00edklad<\/b>: skute\u010dn\u00e1 doba nab\u00edjen\u00ed = 1,04 \u00d7 1,5 = 1,56, tzn. zhruba 1 hodina a 34 minut<\/p>\n

Co je d\u016fle\u017eit\u00e9 v\u011bd\u011bt<\/h2>\n

Celkovou dobu nab\u00edjen\u00ed samoz\u0159ejm\u011b ovliv\u0148uj\u00ed i dal\u0161\u00ed faktory<\/b>, jako je teplota okol\u00ed nebo kvalita a d\u00e9lka pou\u017eit\u00e9ho kabelu, stav a st\u00e1\u0159\u00ed baterie (star\u0161\u00ed baterie se nab\u00edj\u00ed pomaleji a m\u00e9n\u011b efektivn\u011b). Pokud nav\u00edc telefon b\u011bhem nab\u00edjen\u00ed aktivn\u011b pou\u017e\u00edv\u00e1te, pak velk\u00e1 \u010d\u00e1st v\u00fdkonu adapt\u00e9ru padne na pokryt\u00ed aktu\u00e1ln\u00ed spot\u0159eby a samotn\u00e9 dopl\u0148ov\u00e1n\u00ed energie se logicky v\u00fdrazn\u011b zpomal\u00ed. Pro nejrychlej\u0161\u00ed v\u00fdsledek je ide\u00e1ln\u00ed nechat telefon v klidu.<\/p>\n

\"Jak<\/a>
Jak spo\u010d\u00edtat dobu nab\u00edjen\u00ed z kapacity baterie a v\u00fdkonu nab\u00edje\u010dky?<\/figcaption><\/figure>\n

Pr\u00e1v\u011b u kabel\u016f a adapt\u00e9r\u016f se nevypl\u00e1c\u00ed \u0161et\u0159it. A\u010dkoli levn\u00e9, nezna\u010dkov\u00e9 alternativy mohou vypadat na prvn\u00ed pohled stejn\u011b, \u010dasto skr\u00fdvaj\u00ed pod\u0159adn\u011bj\u0161\u00ed vnit\u0159n\u00ed zapojen\u00ed a chyb\u011bj\u00edc\u00ed komunika\u010dn\u00ed \u010dipy. Nejen\u017ee takov\u00fd kabel m\u016f\u017ee zpomalit nab\u00edjen\u00ed kv\u016fli vy\u0161\u0161\u00edmu odporu, ale v kombinaci s necertifikovanou nab\u00edje\u010dkou p\u0159edstavuje i bezpe\u010dnostn\u00ed riziko. Pou\u017e\u00edv\u00e1n\u00ed origin\u00e1ln\u00ed nab\u00edje\u010dky a kabelu v\u00e1m zaru\u010d\u00ed, \u017ee si telefon s adapt\u00e9rem spr\u00e1vn\u011b \u201erozum\u00ed\u201c a cel\u00fd proces prob\u011bhne nejen rychle, ale hlavn\u011b bezpe\u010dn\u011b.<\/p>\n

Na\u0161\u00edm c\u00edlem nebylo naj\u00edt vzorec s p\u0159esnost\u00ed na sekundy, ale sp\u00ed\u0161e pochopit principy, kter\u00e9 za rychlost\u00ed nab\u00edjen\u00ed stoj\u00ed. D\u00edky tomu si m\u016f\u017eete nejen l\u00e9pe napl\u00e1novat \u010das, ale tak\u00e9 si p\u0159i n\u00e1kupu nov\u00e9ho p\u0159\u00edslu\u0161enstv\u00ed snadno ov\u011b\u0159it, zda bude spl\u0148ovat va\u0161e o\u010dek\u00e1v\u00e1n\u00ed. Zkuste si schv\u00e1ln\u011b spo\u010d\u00edtat a zm\u011b\u0159it \u010das u sv\u00e9ho telefonu \u2013 mo\u017en\u00e1 budete p\u0159ekvapeni, jak bl\u00edzko se k realit\u011b dostanete.<\/p>\n

\"\"<\/a><\/p>\n

\u0158e\u0161ili jste n\u011bkdy, jak spo\u010d\u00edtat dobu nab\u00edjen\u00ed?<\/b><\/p>\n","protected":false},"excerpt":{"rendered":"

Pus\u0165me se spole\u010dn\u011b do odhalov\u00e1n\u00ed jedn\u00e9 z velk\u00fdch z\u00e1had modern\u00ed techniky. Pro\u010d se jeden telefon s 5000mAh bateri\u00ed nabije za<\/p>\n","protected":false},"author":3,"featured_media":151304,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"colormag_page_container_layout":"default_layout","colormag_page_sidebar_layout":"default_layout","_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[2],"tags":[2373,679,3517,12852,1487,1488,2193],"class_list":["post-151295","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-clanky","tag-akumulator","tag-baterie","tag-nabijeci-adapter","tag-nabijeci-kabel","tag-nabijecka","tag-nabijeni","tag-rychle-nabijeni"],"wppr_data":{"cwp_meta_box_check":"No"},"yoast_head":"\nJak spo\u010d\u00edtat dobu nab\u00edjen\u00ed z kapacity baterie a v\u00fdkonu nab\u00edje\u010dky?<\/title>\n<meta name=\"description\" content=\"Uk\u00e1\u017eeme v\u00e1m, jak spo\u010d\u00edtat dobu nab\u00edjen\u00ed, kdy\u017e zn\u00e1te 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