About batteries

[Nistorescu Sorin]

Looking at actual Data Sheet for LS/T3/T1M and I'm trying to guess for inside batteries:
LS = 85.0Wh (2 units with 8 x 18650 Li-ion rechargeable)
T3 = 42.5Wh (1 unit with 8 x 18650 Li-ion rechargeable)
T1M = 42.5Wh (2 units with 4 x 18650 Li-ion rechargeable, one single 18650 element = 50g)

Users would say that the inside batteries weigh too much (I suspect about 800g for the LS), or the device requires a lot of power.

On the other hand one 21700 rechargeable unit with 5000 mAh weigh about 72.5g.

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NL2150HPR (Discontinued)

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Just want to ask if 21700 friendly-replaceable units could decrease the total weigh of the LS system (6 x 72.5g = 435g).

Dedicated/foldable solar panel kit could charge them right in the field, very useful during measurement campaigns, power bank functions, etc.
I think 21700 batteries with twice the power of a standard 18650 battery + low power GNSS boards, could decrease the total weight of the GNSS system, and also the price.

 

[Nistorescu Sorin]

Probably users will need a "Changing Batteries" video for the T3, but I think there are some real chances to cut that 1.25 kg weight (according to T3 datasheet) by using 21700 friendly-replaceable units inside and a USB Type-C connector which will allow charging with all kind of sources including power banks, foldable solar panels, etc.

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If I'm not wrong, 2 x 21780 serial connected units will provide 7.2V x 5Ah = 36Wh, not too far from actual 42.5 Wh, configuration more suitable for NTRIP/Jetpack users, but a UHF radio user will surely need 4 x 21700 (serial/parallel connected) with corresponding 7.2V x 10Ah = 72Wh, more close to actual LS power capabilities.

Anyway, there are also DIY projects all over the world proving that low power consumption, 5V USB Type-C enabled GNSS board + single 21700/3.6V/5000mAh could last days and maybe weeks with more capable solar power banks (experimental receiver 1,2 pictures, summer 2020), but also one single 18650 unit 3.6V/3500mAh could keep a modified T1 GNSS receiver for 10 hours in a NTRIP/Jetpack configuration, as my daughter can confirm starting 2021 (T1_a,b,c pictures).