Wantaim planti handet milien mobail fon long wol, long kamapim sefti i nidim wanpela feil reit we i no winim wanpela long wan handet milien. Tasol, mak bilong ol 'circuit board' i save bagarap em i save antap tru long wanpela long wan handet milien. Olsem na, disain bilong bateri sistem i mas gat tupela lain bilong difens. Wanpela bikpela asua long disain em long sasim bateri pek stret wantaim adapta. Dispela i putim olgeta wok bilong lukautim 'overcharge' long 'protection board' long 'battery pack'. Maski namba bilong ol 'protection board' i no wok gut, maski em i wanpela long wanpela milien, ol pairap i save kamap yet long olgeta de long wol. Sapos bateri sistem i givim tupela lain bilong difens agensim 'overcharge', 'over-discharge', na 'overcurrent', we wanwan difens i gat wanpela 'failure rate' bilong wanpela long ten tausen, tupela lain bilong difens inap long daunim 'failure rate' i go long wanpela long wanpela handet milien.
Wok bilong Bateri Pek: Karent Limita. Sapos yumi tingim wanpela bateri sistem bilong mobail fon olsem eksampel, sistem bilong lukautim 'overcharge' i yusim 'output voltage' bilong 'charger' we i stap klostu long 4.2V long kisim namba wan 'layer' bilong 'protection'. Long dispela rot, maski sapos 'protection board' long 'battery pack' i bagarap, 'battery' bai i no inap long kisim planti 'overcharge' na kamap denja. Namba tu leit bilong proteksen em i 'overcharge' proteksen wok long proteksen bod, we ol i save putim long 4.3V. Dispela i min olsem proteksen bod i no nidim long katim 'charging current'; em i save wok tasol taim 'charger voltage' i antap tumas. Proteksen bilong 'overcurrent' em i save kamap long rot bilong 'protection board' na 'current limiter', na dispela i save givim tupela 'layers' bilong lukautim ol 'overcurrent' na ol 'external short circuits'. Long wanem, 'over-discharge i save kamap tasol taim yu yusim ilektronik prodak, seket bod bilong ilektronik prodak i save givim namba wan leit bilong proteksen, na proteksen bod long bateri pek i save givim namba tu leit. Taim ilektronik prodak i painim wanpela saplai voltej aninit long 3.0V, em i mas pasim otomatik. Sapos dispela wok i no stap insait long prodak disain, proteksen bod bai pasim 'discharge circuit' taim voltej i go daun long 2.4V.
