Raspberry Pi LIPO battery Pack Endurance Test

RE: Raspberry Pi LIPO battery Pack Endurance Test

shabaz — Thu, 01 Jan 2015 22:17:07 GMT

Useful battery pack! That's more than half the capacity of the (massive) battery on my laptop.

Thinking about getting one to charge the mobile phone on trips.

RE: Raspberry Pi LIPO battery Pack Endurance Test

rew — Thu, 01 Jan 2015 10:24:51 GMT

John,

The battery pack is rated at 10Ah at 3.7V. That would mean it should be able to provide 10/5*3.7 = 7.4Ah at 5V, assuming 100% conversion efficiency. With the pi running at 350mA you should in theory get 21 hours out of it. Hmmm. with "only" 17 hours, that would mean the 3.7 to 5V step up is about 80% efficient assuming the battery capacity of your battery pack is as advertized.

I have a pack, advertised as double that of yours (20Ah) which I measured to have only 6700mAh. (which is still better on the $/Ah metric than yours because I got it cheap).

I also measured a step-up converter yesterday. It was taking about 2.8A at 3.8V to output 1.7A at 5V. An efficiency on the order of 60%.

So, for people who want to reproduce your results: Keep in mind that John has bought a 10Ah battery pack that actually achieves the claimed capacity and the pack he has, achieves a reasonable to good conversion efficiency.

To achieve even longer runtimes, get a B+ or A+. I have measured my "A+" run at around 100mA, meaning you'd get a full two days out of your 10Ah pack!

RE: Raspberry Pi LIPO battery Pack Endurance Test

larisbird — Thu, 01 Jan 2015 04:40:42 GMT

that was a great idea!! thanks for testing that out. pretty impressive results.

I have a Mi Power Bank (Xiaomi) that will work perfectly. I guess the best way to solve my problem with the 12V 3.5" display is to use a power bank like this with a step up regulator. I wonder what result would be then....

Thanks again John and Happy New Year,

Jack