Mixed batteries/mAh

[Mitcon]

Just thinking about someone else's post. If you read the instructions that came with the grip they state you can use 1 battery or 2 batteries with a different state of charge to each other. So I'm wondering what would be the harm in mixing brands/mAh rating batteries with each other in a grip ?

I have different brands of batteries with different mAh ratings, but I tested them all on a multimeter when fully charged and they all have 8.4 volts. I thought that mAh is just a runtime/sustained energy rating. EG: if a battery is rated 7.4v-720mAh does this not just mean the battery can supply 7.4 volts for a period of 720 milliamp hours ?

My question is if the instructions say you can use 2 batteries in the grip at a different state of charge to each other, why would there be a problem with mixing brands/mAh rating batteries. Would this not be the same result.

[Salleke]

Just thinking about someone else's post. If you read the instructions that came with the grip they state you can use 1 battery or 2 batteries with a different state of charge to each other. So I'm wondering what would be the harm in mixing brands/mAh rating batteries with each other in a grip ?

I have different brands of batteries with different mAh ratings, but I tested them all on a multimeter when fully charged and they all have 8.4 volts. I thought that mAh is just a runtime/sustained energy rating. EG: if a battery is rated 7.4v-720mAh does this not just mean the battery can supply 7.4 volts for a period of 720 milliamp hours ?

My question is if the instructions say you can use 2 batteries in the grip at a different state of charge to each other, why would there be a problem with mixing brands/mAh rating batteries. Would this not be the same result.

Mitcon - If a battery is rated at 7.4 volts and 720 mAh it means that it can supply 720 mA for 1 (ONE) hour at 7.4 volts.

You CAN/MAY NOT, NEVER, NEVER mix batterys with a different Voltage. Like mixing a 7.4 with 8.4 volt!!! It's difficult to explain
why this is in a few words but you can trust me on this.

If a battery is rated 7.4 Volt it's perfectly possible that, fully charged, you can measure a slightly higher voltage
if the battery is not delivering current to a load at the moment that you measure the Volts.

You can use batterys of different mAh (NOT THE VOLTS) but keep in mind that when you charge such a mixed mAh Combo
you must charge longer so the heavyer battery gets his full charge.

[Jon, The Elder]

sallekes right - it is the voltage that has to be the same, you can mix and match brands as you like.