How Long Will A D Cell Battery Last With 100 Ma Current Draw

Battery Capacity

Here are some conservative power ratings for skillful quality alkaline-manganese dioxide batteries bachelor at the local grocery store.

Battery Blazon	Capacity (mAh)	Typical Bleed (mA)
D	13000	200
C	6000	100
AA	2400	l
AAA	1000	ten
N	650	x
ix Volt	500	xv
vi Volt Lantern	11000	300

The bombardment chapters will be better with lower drain currents. To decide the battery life, carve up the chapters by the actual load current to get the hours of life. A circuit that draws ten ma powered by a nine volt rectangular bombardment will operate nigh 50 hours: 500 mAh /ten mA = 50 hours The cell voltage of alkali metal cells steadily drops with usage from i.54 volts to about one volt when discharged. The voltage is near 1.25 volts at the 50% belch point. Alkaline cells exhibit a slightly increased capacity when warmed and the capacity drops significantly at temperatures below freezing. Mercury and silver oxide batteries have nearly twice the capacity every bit alkaline metal batteries of the same size but the current ratings are significantly lower. Element of group i batteries as well have good shelf life making them platonic for home-made electronic projects. Rechargeable batteries take less capacity than primary cells as shown in the following chart. This chart shows the chapters as a per centum of the chapters of an alkaline battery with the same dimensions.

Bombardment Type	% Capacity
Lead-acid	35
Nickel-cadmium	thirty
Silver-zinc	85

A new type of rechargeable alkali metal battery is coming on the market place at the time of this writing and may offer ameliorate price/performance than ni-cads. Ni-cad cells have a nominal voltage of 1.2 volts and are usually charged at 1/10 the amp-hour rating. The recharging takes longer than ten hours as this charging rate might inply due to charging inefficiency. Total charging normally taking at least xiv hours. Special ni-cad cells can tolerate charging rates approaching the amp-hour rating just special chargers that cut dorsum the charging electric current when the battery becomes warm are required. Lead-acid cells take a nominal voltage of 2 volts and may be charged at a high rate, typically above the amp-hour charge per unit. The charger may be a unproblematic current-limited voltage source supplying 2.33 volts per cell at room temperature with a -iv mv/ �C temperature coefficient.

Misc Battery Capacities

Bombardment Type	mAh	Typical Drain	Notes
223 Lithium Manganese, 6 volt	1500	50 mA	Bang-up for intermittent high currents
28L Lithium Manganese, 6 volt	160	v mA	Great for light loads