And yes the capacity of different cells vary so you're guaranteed to not get even discharge and best life. tom
On Sat, Aug 14, 2010 at 06:44:46PM -0700, Tom Fowle wrote: > spiro > You shouldn't mix battery types because both there voltage and internal > resistance differ between types. > Thus the load placed on each cell will not be ballanced and one cell in a > mixed pack can discharge before others. this can cause excess heating in > some cells, particularly with devices that draw signifficant power like > anything with a motor. > > The best that can be said is that you won't get decent battery life with a > mixed pack, the worst might be hot cells or even explosions. > > As for why a device might say not to use rechargables, 2 ideas, 1. any > battery sensor that tells you when batteries are low won't work correctly > with rechargables unless it knows to do so. This because rechargables have > different voltages. > > 2. since most rechargables have lower internal resistances than alcaline > cells, much more current can be drawn from rechargables. It is possible > some device might draw so much current as to get cells hot if not designed > with proper current limiting circuits. > > So be good and do it right, you'll get better battery life and less > excitement. > > tom Fowle > > OnSat, Aug 14, 2010 at 06:17:11PM -0400, Spiro wrote: > > okay, Tom or someone explain this to me: > > > > a toy my kid just got says this: > > > > do not mix *alkaline, *standard, or *rechargable batteries > > do not use *rechargable batteries. > > > > It's a motor, that tosses little sponge ring 30 feet. > > It's like a semi-auto with the magazine above instead of below. > > So why ot mix, to start, and what reason not to use rechargables for the 2 > > AA needed? > > > > I've mixed batteries before. > > What should I have noticed? > > I have a dozen rechargable AA and have placed a tiny piece of scotch tape > > on each one so I don't toss them out. > > Even though it doesn't save actual energy it saves the containers constant > > disposal. > > > > > > > >
