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Pump Battery Change Log

  • Pump: MM 723 v2.4A
  • Looping 24/7 (nominally), running every five minutes

Summary:

Battery Type n Mean Duration [hr] Standard Deviation [hr]
Energizer Ultimate Lithium 2 232.0 7.4
Energizer Max 2 151.0 4.2
Duracell Copper Top 1 143.5
Panasonic Eneloop 1 130.8
AmazonBasics 6 128.5 22.9
Varta 3 126.6 11.8
RadioShack 2 104.9 2.7
Duracell Ultra PowerPix 2 99.8 22.3
Total 19 136.9 39.2

Change-Outs:

ID Start Date & Time Battery Type Duration [hr] Starting Voltage [V] Ending Voltage [V]
01 2015-08-26 11:00 AmazonBasics 124.5
02 2015-08-31 15:30 AmazonBasics 101.5
03 2015-09-04 21:00 Energizer Ultimate Lithium 237.25
04 2015-09-14 18:15 Energizer Ultimate Lithium 226.75
05 2015-09-24 07:30 AmazonBasics 111.5 1.29 / 1.17
06 2015-09-28 23:00 RadioShack 103.0 1.60 / 1.47 1.31 / 1.17
07 2015-10-03 08:30 RadioShack 106.75 1.59 / 1.46
08 2015-10-07 19:15 AmazonBasics 158.0 1.28 / 1.16
09 2015-10-14 09:30 Varta 132.75 1.57 / 1.44 1.30 / 1.16
10 2015-10-19 22:30 Varta 113.0 1.58 / 1.46         / 1.16
11 2015-10-24 23:00 AmazonBasics 154.25         / 1.51 1.29 / 1.14
12 2015-10-31 09:15 Panasonic Eneloop 130.75 1.44 / 1.41 1.18 / 1.17
13 2015-11-05 20:00 Duracell Ultra PowerPix 84.0 1.64 / 1.53 1.31 / 1.18
14 2015-11-09 08:00 Energizer Max 154.0 1.54 / 1.45 1.27 / 1.17
15 2015-11-15 18:45 AmazonBasics 121.25 1.59 / 1.52 1.30 / 1.17
16 2015-11-20 20:30 Duracell Ultra PowerPix 115.5 1.64 / 1.54         / 1.17
17 2015-11-25 16:00 Energizer Max 148.0         / 1.47 1.26 / 1.17
18 2015-12-02 20:00 Varta 134.0 1.57 / 1.46 1.29 / 1.15
19 2015-12-08 10:00 Duracell Copper Top 143.5 1.58 / 1.45 1.33 / 1.17
20 2015-12-14 09:30 AmazonBasics 1.62 / 1.51

Batteries:

Notes:

  • Voltage measurements taken two ways at beginning and end of use:
  • First listed value is open-circuit, as measured using a multimeter
  • Second listed value is reported by the pump using openaps use pump read_battery_status, either right after battery insertion or on final loop before pump goes to "Low Battery" state
  • Battery 03: Stayed at full bars for first ~230 hours, then went to two bars and then zero bars within the final 10 hours
  • Battery 04: Performed similarly, going from full bars when I went to sleep to a "Low Battery" state when I woke up (hence the discrepancy between the duration and the start time of the next battery)
  • Battery 08: Higher duration likely due to extended periods where APS was not active
  • Battery 09: At the end, caught the status reading "low"—meaning there was a successful transmission after it went to "Low Battery" state (happened about 7 minutes after the alert)
  • Battery 11: Higher duration likely due to extended periods where APS was not active; starting and ending voltages as read by the pump were also the highest and lowest seen, respectively, thus far
  • Battery 12: Charged to full capacity immediately before testing/insertion; voltage started low but hung around ~1.25 V (per openaps use) longer than others, anecdotally

References:

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