In 2010 I had some problems with my replacement BLM-1 batteries for my Olympus E-30. Since then I kept a page recording the charge history of the batteries since October 2010. This page does the same thing for my newer cameras, the Olympus OM-D E-M1 Mark II that I got on 23 February 2017, and then the Olympus OM-D E-M1 that I got on 3 December 2013. And yes, this page violates my horror of reverse chronological data: the newer camera is not really related to the older one, so there's no order to consider. See the detail page for more information.

The status column has the following meanings:

• OK: still has charge, removed for some other reason.

• Charged: Battery was discharged, was successfully charged again.

• Fading: Battery required multiple attempts to charge.

• Sick: Battery took some charge, didn't complete charge. Battery still usable.

• Dead: Charge failed, battery showed no voltage.

• Resurrected: Charge failed, battery showed no voltage after charge, but later showed voltage again.

I haven't had either of the last two status for these cameras, but I did for the E-30 batteries.

OM-D E-M1 Mark II

Battery		Date		Last		Count		Status		Comments
		started		image
1		23 February 2017		583		583		Charged
1		11 March 2017		1500		917		Charged		38% left
1		14 April 2017		2003		503		Charged		37% left
1		30 April 2017		2484		481		Charged		39% left
1				2981		497		Charged		32% left
1		13 May 2017		3537		556		Charged
1		23 May 2017		4175		638		Charged		34% left
1		15 June 2017		4689		514		Charged		37% left
1		Date may not include time		5298		611		Charged		29% left
1		21 July 2017		5954		656		Charged		37% left
1		7 August 2017		6761		807		Charged		22% (red)
2		26 August 2017		7449		688		Charged		18% (red)
1		18 September 2017		7985		536		Charged		18%?
2		4 October 2017		8691		706		Charged		red (< 20%?)
1		15 October 2017		9748		1057		Charged
2		6 November 2017		10581		833		Charged		33% → red flash
1		22 November 2017		14169		3588		Charged		Focus stack experiments
2		10 December 2017		15046		877		Charged		25%
1		30 December 2017		15800		754		Charged		21%
2		26 January 2018		16432		632		Charged
1		23 February 2018		17184		752		Charged		18%
2		1 April 2018		17712		528		Charged		13%
1		2 May 2018		18482		770		Charged		12%
2		3 June 2018		19222		740		Charged		12%, not completely discharged
1		7 July 2018		19909		687		Charged		11%
2		28 July 2018		20699		790		Charged		18%
1		25 August 2018		21256		557		Charged		27%, not completely discharged
2		17 September 2018		21623		367		Charged		25%, not completely discharged
1		6 October 2018		22422		799		Charged		10%?		Red light flashing
2		23 October 2018		23199		777		Charged		15% odd
1		7 November 2018		24114		915		Charged		14%
2		24 November 2018		23892		778		Charged		12%
1		21 December 2018		25426		1534		Charged		flashing, much video.
2		19 January 2019		25982		556		Charged
1		16 February 2019		27524		1542		Charged
2		22 March 2019		28123		599		Charged
1		17 April 2019		28861		758		Charged
2		25 May 2019		29522		661		Charged
1		23 June 2019		30199		677
2		13 July 2019		?				Charged
1		?		31151				Charged
2		29 August 2019		31862		709		Charged
1		28 September 2019		32587		725		Charged
2		18 October 2019		33712		1125		Charged
1		11 November 2019		33953		241		OK		75%
2		22 November 2019						OK		55% preparation for video
1		23 November 2019		34182		229		OK
2		28 November 2019		34966		784		Charged		10%
1		22 December 2019		35641		675		Charged
2		6 January 2020		36201		560		Charged		12%
1		29 January 2020		36525		325		Charged		11%
2		11 February 2020		37888		1363		Charged		10%
1		8 March 2020		38490		602		Charged		10%
2		6 April 2020		39113		623		Charged		10%
1		7 May 2020		39739		626		Charged		10%
2		23 May 2020		40305		566		Charged		10%
1		20 June 2020		40813		508		Charged		10%
2		17 July 2020		41539		726		Charged		10%
1		1 August 2020		41916		377		Charged		10%		Left powered on?
2		26 August 2020		42409		493		Charged		10%
1		19 September 2020		42993		584		Charged		10%
2		7 October 2020		44241		1248		Charged		10%
1		28 October 2020		44870		629		Charged		10%
2		17 November 2020		45548		678		Charged		10%
1		8 December 2020		46116		568		Charged		10%
2		28 December 2020
1				47407				Charged
?				47949		542
1		22 February 2021		48335		384		Charged		10%		30 minutes video
2		29 March 2021		49034		699		Charged		10%
1		24 April 2121		49632		598		Charged		10%
2		21 May 2021		50296		664		Charged		10%
1		20 June 2021		50875		579		Charged		10%
2		23 July 2021		51685		810		Charged		10%
1		21 August 2021		52294		609		Charged		10%
2		11 September 2021		52963		669		Charged		10%
1		11 October 2021		53722		759		Charged		10%
2		17 November 2021		53734		14		Charged		10%		started at 95%, repeated
1		18 November 2021		54433		599		Charged		11%
2		29 December 2021		55211		778		Charged		10%
1		29 January 2022		55874		763		Charged		10%
2		12 March 2022		56615		741		Charged		11%
1		16 April 2022
2				57986		(1371)		Charged		10%
1		24 June 2022		58652		666		Charged		10%
2		21 July 2022		59087		435		Charged		10%		left powered on
1		6 August 2022		59992		905		Charged		10% + 36
2		17 September 2022		60789		797		Charged		10%
1		25 October 2022		61598		809		Charged		10%
2		26 November 2022		62484		886		Charged		<10% (red flashing)
1		31 December 2022		63083		599		Charged		<10% (red flashing)
2		2 February 2023		63985		902		Charged		<10% (at least 36 over)
1		4 March 2023		64716		731		Charged
2		14 April 2023		65745		1029		Charged
1		1 June 2023		66621		876		Charged
2		5 August 2023		67667		1046		Charged		< 10% (52 over), needed recharge before use
1		17 September 2023		68764		1097		Charged		Left powered on
2		14 October 2023		69615		851		Charged		Left powered on
1		25 November 2023		69617		2		Charged		Left powered on
2		5 January 2024		70409		582		Charged		Something wrong here
1		17 February 2024		71784		1375		Charged
2		27 February 2024		71980		196		Charged		Left powered on
?
2		?		73059				Charged
1		13 April 2024		73873		714		Charged
2		22 May 2024		74890		1017		Charged		< 10% (117 over)
1		6 July 2024		75735		845		Charged
2		8 August 2024		76634		899		Charged
1		2 October 2024		77647		1013		Charged		< 10% (At least 48 over)
2		9 November 2024		78340		693		Charged
1		21 December 2024

OM-D E-M1 Mark I

When I got the Olympus OM-D E-M1, it was configured to reset the image count every day, which makes it really difficult to count the number of images taken. I fixed that on 10 December 2013 after taking 59 images. Thus the difference in the counts at the beginning.

Battery 1 was an original Olympus BLN-1 with a capacity of 1220 mAh. The others are aftermarket batteries with a claimed capacity of 1999 (!) mAh. The charge history suggest that they might have about half that capacity. But they were far cheaper, so I'm not complaining.

Since getting the OM-D E-M1 Mark II, I used this camera less, so the batteries stayed in longer. As observed elsewhere, this means that I get fewer photos from a charge.

In May 2024, the camera failed with a mechanical failure (IBIS?) that wasn't worth repairing. On 27 May 2024 I replaced it with another camera of the same model. I continue to use the same batteries, including a new one that came with the camera.

Battery		Date		Last		Count		Status		Cumulative		Comments
		started		image						count
1		4 December 2013		26		26		charged		26
1		6 December 2013		426		449		charged		449
2		17 December 2013						charged				initial charge
3		17 December 2013						charged				initial charge
4		17 December 2013						charged				initial charge
2		20 December 2013		654		205		charged		205
3		23 December 2013
4		28 December 2013		1118				charged
1		4 January 2014		1887		769		charged		769
2		11 January 2014		2205		318		charged		318
3		18 January 2014		2396		191		charged		191
4		26 January 2014		2857		461		charged		461
1		2 February 2014		3778		921		charged		921
2		15 February 2014		4062		289		charged		289		videos
3		22 February 2014		4067		5		OK		5
4		23 February 2014		4679		612		OK		612
3		1 March 2014		5025		346		OK		346
4		15 March 2014										Was this a typo?
1		15 March 2014		6019		994		charged		994		Assuming the typo
2		5 April 2014		6219		200		charged		200
3		13 April 2014		6790		571		charged		571		Discharged to red indication
4		20 April 2014		7397		607		charged		607
1		3 May 2014		540		656		charged		666		Counter reset from 7503 to 0
2		18 May 2014		762		222		OK		222
3		18 May 2014		1132		370		charged		370
4		1 June 2014		1728		596		charged		596
1		9 June 2014		2286		558		charged		558
2		1 July 2014		2710		424		charged		424		flashing LED on first attempt
3		12 July 2014		3095		385		charged		385
4		23 July 2014		3575		480		charged		480
1		2 August 2104		4133		558				588
2		29 August 2014		4745		612		OK		612		removed before camera repair
1		27 September 2014		769		769		charged		769		started counting from 0 again
2		11 October 2014		1125		356
4		15 October 2014		1154		29		OK		29
3		15 October 2014		1457		303		OK		303		Many macros
4		19 October 2014		1571		114		charged		114
1		25 October 2014		2111		540		charged		540
2		4 November 2014		2440		329		charged				left powered on
3		"21014109" is not a valid date		2881		441		charged		441
4		15 November 2014		3276		395		charged		395
1		24 November 2014		4091		815		charged		815
2		13 December 2014		4567		376		charged		376
3		21 December 2014		5050		483		charged		483
4		4 January 2015		5434		384		charged		384
2		17 January 2015		5440		6		OK		6
1		17 January 2015		6233		793		charged		793
2		31 January 2015		6672		439		charged		439
3		14 February 2015		7032		360				360		no boost before use
4		20 February 2014		7515		483		charged		483
1		3 March 2015		8138		623		charged		623
2		15 March 2015		8480		342		charged		342
4		23 March 2015		8954		474		charged		474
1		4 April 2015		9822		868		charged		868
2		21 April 2015		0059		236		charged		236
3		29 April 2015
4				0872
1		24 May 2015		1234		362		charged		362
2		11 June 2015		1527		293		charged		293
3		27 June 2015		1545		18		charged		18		not recharged last time?
4		27 June 2015		1612		67				67		left powered on
3		27 June 2015		1863		251		OK
1		27 June 2015		1863		251		OK
1		31 July 2015		468		468		charged		468		after repair, counter reset
2		22 August 2015		700		232		charged		232
3		30 August 2015		965		265		charged		265
4		19 September 2015		1240		275		charged		275
1		29 September 2015		1675		435		charged		435
3		22 October 2015		1955		280		charged		280
2		5 November 2011		2293		298		charged		298		Problems refreshing (error indication, went away)
4		22 November 2015		2613		320		charged		320
1		29 November 2015		3179		566		charged		566
2		21 December 2015		3505		326		charged		326
3		6 January 2016		3826		320		charged		320
4		17 January 2016		4201		375		charged		375
1		6 February 2016		4808		607		charged		607
2		21 February 2016		5077		269		charged		269
3		27 February 2016		5672		595		charged		595
4		29 February 2016		5855		183		charged		183
1		1 March 2016		6450		595		charged		595
2		15 March 2016		6774		324		charged		324
3		26 March 2016		7184		410		charged		410
4		10 April 2016		7449		265		charged		265
1		16 April 2016		8096		647		OK		647		(Assumed transition)
2		14 May 2016		8934		838		OK, charged		838
3		22 May 2016		9318		384				384
4		30 May 2016		9403		85		OK, charged
4		30 May 2016		9911		508		OK, charged
1		11 June 2016		0072		161		charged
4		14 June 2016		0094		22		OK
2		14 June 2016		0094		0		DOA
3		17 June 2016		0462		368		charged		368		blinked, removed, OK
2		30 June 2016		0762		300		charged		300
4		16 July 2016		0783		21		Charged		21
1		16 July 2016		1477		694		Charged		694
3		6 August 2016		1721		244		Charged		244
4		17 August 2016		2213		392		Charged		392
1		2 September 2016		2836		623		Charged		623
2		19 September 2016		3319		493		Charged		493
3		26 September 2016		3628		309		Charged		309
4		10 October 2016		3837		209		Charged		209
1		20 October 2016		4520		683		Charged		683
2		12 November 2106		4722		202		Charged		202		left powered on
3		19 November 2016		5064		342		Charged		342
4		28 November 2016
1				5813
2		26 December 2016		5979		156		Charged		156
3		31 December 2016						Fading				Boost charge failed, repeat succeeded
4		31 December 2016		6305		326		Charged		326
3		19 January 2017		6425		120		Charged		120		Left powered on
1		25 January 2017		6901		476		Charged		476
2		12 February 2017		7067		166		Charged		166		Left powered on, dead before recharge
3		23 February 2017		7199		132		Charged		132
4		23 March 2017		7414		215		Charged		215
1		12 May 2017		7788		364		Charged		364
2		31 July 2017		7796		8		OK		8
2		31 July 2017		7903		107		Charged		107
3		29 August 2017		8154		251		Charged		251
4		20 September 2017		8343		189		Charged		189
1		15 October 2017		8672		329		Charged		329
2		28 November 2017		10439		767		Charged		767
3		26 December 2017		10652		223		Charged		223
4		16 February 2018		114				Charged				Counter reset by firmware upgrade
2		15 March 2018		348		234		Fading		234		Required two attempts
3		6 April 2018		1158		810		Fading		810		Three attempts
4		28 April 2018		1371		214
2		1 May 2018						Fading				Refresh took 2 attempts
1		17 May 2018		1623		252		Charged		252
2		1 September 2018
1		17 September 2018		1764		Charged
2		8 November 2018		1854		90		Charged		90
3		21 December 2018		2045		191		Charged		191
4		5 March 2019		2165		120		Fading		120		Required two attempts
1		29 June 2019		2264		99		Charged		99		Required two attempts
2		21 September 2019		2441		177		Charged		177
3		15 October 2019		2584		143		OK		143		Preparations for long shooting day
2		22 November 2019		2803		219		Charged		219
3		8 December 2019		2965		162		Charged		162		Camera left powered on
4		26 January 2020		3133		168		Charged		168
1		25 March 2020
2		?		3377				Charged
3		26 September 2020		3559		182
4		?		3676				Charged
1		23 April 2021		3715		39		Charged
1		24 April 2021		4003		288		Charged
2		9 July 2021		4154		151		Charged
3		24 August 2021		4356		310		Charged
4		24 August 2021						fail
2		24 August 2021						fail
4		24 August 2021						Charged
2		24 August 2021						Charged
1		15 October 2021		4670		314		Charged
2		27 November 2021
4
1		2 March 2022		5609				Charged
2		3 April 2022						dead, discarded
3		3 April 2022		5888		279
4		15 May 2022		6175		287		dead, discarded
1		14 July 2022		6307		132		OK
5		26 July 2022		6476		169		OK		Left powered on?		Observe
5		22 August 2022		6485		9		dead		returned
1		22 August 2022		6557		72		OK		replaced with 6
6		26 August 2022		6923		366		Charged
6		4 September 2022		7070		147		Charged
6		25 September 2022		7272		202		Charged
6		21 October 2022		7423		151		Charged
3		21 November 2022		7471		48		OK, charged
6		21 November 2022		7627		156		Charged
6		20 December 2022		7821		194		Charged
1		16 January 2023		7841		20		Charged		Left powered on
3		21 January 2023		7945		104		Charged		Left powered on
4		17 February 2023		8167		222		Works after all
6		25 March 2023		8293		126		charged		left powered on
1		18 April 2023		8441		148		charged		completely discharged before charging
3		22 May 2023		8638		197
4		20 August 2023		8774		136		charged		left powered on
3		12 September 2023		9023		249		sick		charged after 4th attempt
6		7 November 2023		9111		88		charged
1		Date may not include time
4		26 November 2023		9145				charged
6		10 February 2024		9623				charged
1		7 April 2024		9745		122		charged		left powered on
3		7 April 2024		9962		217		charged
3		13 August 2024		10194		232		charged		overrun warning by 47 shots
4		22 September 2024		10412		218		charged
6		3 November 2024

E-PM1

I got the Olympus E-PM1 on 4 January 2017. It's only intended for occasional use, so in most case the battery charge reflects the lack of use.

I started this table some time after getting the camera. The batteries are compatible with Yvonne's E-PM2, so the numbers might not make sense.

Battery

Date

Last

Count

Status

Cumulative

Comments

started

image

count

4

3904

charged

2

27 August 2017