Sage Sage vs Forma: Comparison - Page 6

DNSB · 03-17-2023, 12:45 AM

Quote:

Originally Posted by Burblebup

(If the Forma is slimmer and lighter, it must be like, what, a matter of millimeters and grams??? Is everyone's hands so weak and dainty that this is an issue???), and it has a ton of storage. What's not to like? A big thumbs up from me, Kobo!

Sage: 160.5 x 181.4 x 7.6 mm 240.8 g

Forma: 160 x 177.7 x 4.2 - 8.5 mm 197 g

So the size is not all that different but the Mobius screen in the Forma is the major contributor to a noticeable weight saving of 43.8 g.

enuddleyarbl · 01-08-2026, 09:49 PM

It's coming up on 3 years since I got this Sage and I've been noticing a shortening of the battery life. So, I performed my battery life test again. Instead of the original 9 hours and 11 minutes that this Sage got new, it now gets 7 hours and 20 minutes:

Hour 1: from 100% to 90% = 10%
Hour 2: from 90% to 80% = 10%
Hour 3: from 80% to 70% = 10%
Hour 4: from 69% to 57% = 12% (1% loss during sleep)
Hour 5: from 57% to 43% = 14%
Hour 6: from 41% to 31% = 10% (2% loss during sleep)
Hour 7: from 31% to 17% = 14%
15 more minutes: from 16% to 10% = 6% (1% loss during sleep -- 10% warning appeared)
2 more minutes: from 10% to 3% = 7% and Shutdown

Note that power drain from 17% charge to Shutdown over the last 17 minutes.

Anyway, I haven't been able to find a video of someone actually replacing the battery on a Sage. From the other videos I've seen, I think the case just wraps around the screen from the back and can be pried off. I haven't found what a replacement battery would be yet. But, I've also read that the battery wires are soldered in. And, I don't solder. So, it looks like I'll be looking for yet another replacement e-reader.

BUT, it looks like Kobo has abandoned the 10" e-reader market. The Sage has been out of stock in the US since last April and, back in August, a Kobo rep told me in a chat that the Sage was discontinued:

https://www.mobileread.com/forums/sh...d.php?t=368773

All Kobo now sells are 6", 7" and 10" e-readers. Those are either too small or too large. Does anyone have a suggestion for a good 8" black-and -white e-reader that works well with Calibre? I don't want color and don't care about note-taking. I just need a good e-reader for these tired, old eyes. Note that Amazon is not an option.

nana77 · 01-09-2026, 01:59 AM

I'll do a full check, but I guess I still have 7 hours of battery on the Forma, from fully charged.
Hope not to seem spamming, (as I always mention it) but I'll suggest (7.8"):
https://pocketbook.ch/en-ch/catalog/...rs/inkpad-4-ch
The video review isn't available to be embedded outside YouTube: PocketBook InkPad 4 review: almost perfect.

01-08-2026, 09:49 PM	#77
enuddleyarbl Guru Posts: 801 Karma: 1538394 Join Date: Sep 2013 Device: Kobo Sage	It's coming up on 3 years since I got this Sage and I've been noticing a shortening of the battery life. So, I performed my battery life test again. Instead of the original 9 hours and 11 minutes that this Sage got new, it now gets 7 hours and 20 minutes: Hour 1: from 100% to 90% = 10% Hour 2: from 90% to 80% = 10% Hour 3: from 80% to 70% = 10% Hour 4: from 69% to 57% = 12% (1% loss during sleep) Hour 5: from 57% to 43% = 14% Hour 6: from 41% to 31% = 10% (2% loss during sleep) Hour 7: from 31% to 17% = 14% 15 more minutes: from 16% to 10% = 6% (1% loss during sleep -- 10% warning appeared) 2 more minutes: from 10% to 3% = 7% and Shutdown Note that power drain from 17% charge to Shutdown over the last 17 minutes. Anyway, I haven't been able to find a video of someone actually replacing the battery on a Sage. From the other videos I've seen, I think the case just wraps around the screen from the back and can be pried off. I haven't found what a replacement battery would be yet. But, I've also read that the battery wires are soldered in. And, I don't solder. So, it looks like I'll be looking for yet another replacement e-reader. BUT, it looks like Kobo has abandoned the 10" e-reader market. The Sage has been out of stock in the US since last April and, back in August, a Kobo rep told me in a chat that the Sage was discontinued: https://www.mobileread.com/forums/sh...d.php?t=368773 All Kobo now sells are 6", 7" and 10" e-readers. Those are either too small or too large. Does anyone have a suggestion for a good 8" black-and -white e-reader that works well with Calibre? I don't want color and don't care about note-taking. I just need a good e-reader for these tired, old eyes. Note that Amazon is not an option. Last edited by enuddleyarbl; 01-08-2026 at 09:51 PM.

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01-09-2026, 01:59 AM	#78
nana77 Wizard Posts: 1,268 Karma: 898412 Join Date: May 2025 Device: Kobo Forma	I'll do a full check, but I guess I still have 7 hours of battery on the Forma, from fully charged. Hope not to seem spamming, (as I always mention it) but I'll suggest (7.8"): https://pocketbook.ch/en-ch/catalog/...rs/inkpad-4-ch The video review isn't available to be embedded outside YouTube: PocketBook InkPad 4 review: almost perfect.

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