How to extend Paperwhite battery life with a powerbank

handyguy · 02-03-2025, 10:43 PM

Hi,
I have hacked my PW to be a standalone clock. With the internal battery, I get about 1 week of life before recharging is needed. I thought I could add attach a small battery pack behind the PW (no AC outlet is nearby) and get much more time before recharging is needed. However, with my 20,000mah (14x the internal battery capacity) I am only getting 2x (2 weeks) the duration.
I think this is because of the oddity of the PW current draw at or near 100% of a fully charged PW.
Any ideas on timings for a circuit I might use between the PW and the power-bank that could 'game' the system, i.e. keep the PW from pulling un-necessary current.

02-03-2025, 10:43 PM	#1
handyguy Connoisseur Posts: 72 Karma: 11789 Join Date: Dec 2019 Device: PW4	How to extend Paperwhite battery life with a powerbank Hi, I have hacked my PW to be a standalone clock. With the internal battery, I get about 1 week of life before recharging is needed. I thought I could add attach a small battery pack behind the PW (no AC outlet is nearby) and get much more time before recharging is needed. However, with my 20,000mah (14x the internal battery capacity) I am only getting 2x (2 weeks) the duration. I think this is because of the oddity of the PW current draw at or near 100% of a fully charged PW. Any ideas on timings for a circuit I might use between the PW and the power-bank that could 'game' the system, i.e. keep the PW from pulling un-necessary current. Last edited by handyguy; 02-04-2025 at 02:25 AM.

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