If this isn’t possible, double check the voltages of each unit with a voltmeter.
With primary (disposable) batteries – only use batteries of the same brand and age (ideally from the same packet). Even rechargeable batteries will not recharge to the same level as new ones.Īs such, the following guidelines are important: If you mix batteries of different ages – the older batteries will always have a lower voltage as all batteries self-discharge over time. With no resistance to slow this charging process, the charged units can overheat as they rapidly drain and the discharged battery can overheat as it attempts to charge at well above its design capabilities. If you connect rechargeable batteries in parallel and one is discharged while the others are charged – the charged batteries will attempt to charge the discharged battery. for secondary (rechargeable) batteries – the stronger battery would charge the weaker one, draining itself and wasting energy. for primary (disposable) batteries – the stronger battery would still try to charge the weaker one reducing the lifespan of both. If these were connected in parallel, you are unlikely to see fireworks, but would experience other issues. This means a 1.5 volt battery from brand X could actually be 1.6 volts, while a 1.5 volt battery from brand Y could be 1.55 volts. 
Due to different manufacturing processes, the exact voltages of batteries from different producers can vary slightly.
If you mix brands even of the same labelled voltage – you can experience problems. It’s worth pointing out that many people accidentally connect batteries of different voltages in parallel every day. 
Again, the larger the difference in voltage the greater the chance of fire or explosion. The result can be over heating, leaking or bulging in the lower voltage battery and/or overheating in the higher voltage battery as it drains rapidly. The lower voltage battery is not designed to charge above a certain point, but the higher voltage battery will try anyway.
secondary (rechargeable) batteries – these only fair a little better. primary (disposable) batteries – they are not designed to take a charge and so the lower voltage battery is likely to overheat, it may leak or bulge and in extreme circumstances where the voltages are very different, it may explode. The battery with the higher voltage will attempt to charge the battery with the lower voltage to create a balance in the circuit. four 1.2 volt 2,000 mAh wired in parallel can provide 1.2 volt 8,000 mAh (2,000 mAh x 4).īut what happens if you wire batteries of different voltages and amp hour capacities together in parallel? Connecting batteries of different voltages in parallel. two 6 volt 4.5 Ah batteries wired in parallel are capable of providing 6 volt 9 amp hours (4.5 Ah + 4.5 Ah). The basic concept is that when connecting in parallel, you add the amp hour ratings of the batteries together, but the voltage remains the same. Connecting in parallel increases amp hour capacity only REMOTER START MILLI AMP DRAW SERIES
For more information on wiring in series see Connecting batteries in series, or our article on building battery banks. This article deals with issues surrounding wiring in parallel (i.e. Different wiring configurations give us different voltages or amp hour capacities. In the graphics we’ve used sealed lead acid batteries but the concepts of how units are connected is true of all battery types. The illustration below show how these wiring variations can produce different voltage and amp hour outputs. But as Tim said, find out what the return policy is and give it a try.There are two ways to wire batteries together, parallel and series. Not to mention the quality of power that usually comes out of those DC power supplies. Knowing this, having a car amp hooked up to a power supply to power a sub is probably not going to work, as when you turn up the volume you are going to start running out of power.
Now there are a lot of conditions to have this happen, you need to have some power hungry amps, the Class A variety are bad when it comes to this, the volume needs to be cranked up, and of course these need to be hooked up to some subs. This is why you will see headlights flickering when the bass is pumping, this is because the alternator is past it's limits and power is coming from the battery and can't keep up with the transients. These large power draws come almost entirely from subwoofer amps, and the amount of time that the current is being drawn that is high is measured in milli-seconds. This isn't entirely true, during large power draws, the alternator can't keep up and the power comes out of the battery.
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