diff --git a/handbook/charging.html b/handbook/charging.html
index 80f97dc97..606e200b3 100644
--- a/handbook/charging.html
+++ b/handbook/charging.html
@@ -25,6 +25,11 @@ charger. Go to <a href="#RCcharge">RC charger</a>.</li>
 packs. Bigger packs will take longer to charge from empty. The
 capacity is on the cell label next to the yellow connector.</p>
 
+<p>Each pack has a sliding indicator on the side. This is entirely
+manual, but is very useful for indicating when a pack is known to be
+charged, flat, or partly discharged. Slide the slider to show green
+for full, red for flat, half and half for 'partly used'.</p>
+
 <h3>Using Makita charger</h3>
 
 <p>This is blue charger with 3 LEDs, and diagrammatic charging info on RH side. CHarges at up to 100W.</p>
@@ -113,7 +118,15 @@ as 4-cell packs, to 4.1V per cell-pair. They can be charged at up to
 packs have this yet (2017). The official Makita packs use Sony SE
 US18650VT (1.5Ah, 20A high-drain) cells, and we have a few with with Samsung
 INR18650-13Q (1.3Ah high-drain cells). All give a reliable 2.3-2.6Ah
-capacity in practice, even after 9 years expo useage. </p>
+  capacity in practice, even after 9 years expo useage.</p>
+
+<p>At end 2017 we bought two 4Ah packs. The non-makita one uses LG
+DAHD21865 cells (2Ah, 25A). I can't read the Makita cell type without
+unwelding the pack. For 2018 we made 3 new 5Ah packs from Samsung 25R
+cells (2.5Ah, 20A) (Sponsored by uk18650.com).</p>
+
+<p>The drill discharges at 26A current draw when drilling (~400W), so
+that's 13A per cell in a 2P configuration.</p>
 
 <h3>Makita charging protocol issues</h3>